Latest content added for UNT Digital Library Partner: UNT Libraries Government Documents Departmenthttps://digital.library.unt.edu/explore/partners/UNTGD/browse/?sort=added_d&fq=str_year:1940&fq=untl_decade:1940-19492018-12-18T09:48:50-06:00UNT LibrariesThis is a custom feed for browsing UNT Digital Library Partner: UNT Libraries Government Documents DepartmentPractical Air Navigation2018-12-18T09:48:50-06:00https://digital.library.unt.edu/ark:/67531/metadc958093/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc958093/"><img alt="Practical Air Navigation" title="Practical Air Navigation" src="https://digital.library.unt.edu/ark:/67531/metadc958093/small/"/></a></p><p>This book was designed to use as a text on air navigation on private ground course of the Civilian Pilot Training Program, and is the fourth edition of the publication "Practical Air Navigation and the Use of Aeronautical Charts of the U.S. Coast and Geodetic Survey" by Thoburn C. Lyon.</p>Subsurface Geology and Oil and Gas Resources of Osage County, Oklahoma: Part 6. Township 28 North, Ranges 10 and 11 East and Township 29 North, Ranges 9 to 11 East2017-10-25T14:26:56-05:00https://digital.library.unt.edu/ark:/67531/metadc1036532/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc1036532/"><img alt="Subsurface Geology and Oil and Gas Resources of Osage County, Oklahoma: Part 6. Township 28 North, Ranges 10 and 11 East and Township 29 North, Ranges 9 to 11 East" title="Subsurface Geology and Oil and Gas Resources of Osage County, Oklahoma: Part 6. Township 28 North, Ranges 10 and 11 East and Township 29 North, Ranges 9 to 11 East" src="https://digital.library.unt.edu/ark:/67531/metadc1036532/small/"/></a></p><p>This report is part of a series describing the structural features, the character of the oil- and gas-producing beds, and the localities where additional oil and gas may be found in parts of Osage County, Oklahoma. This part discusses the geology and resources in the northeastern part of the county, along the Oklahoma-Kansas boundary.</p>Subsurface Geology and Oil and Gas Resources of Osage County, Oklahoma: Part 5. Townships 26 and 27 North Ranges 10 and 11 East2017-10-25T14:26:56-05:00https://digital.library.unt.edu/ark:/67531/metadc1036516/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc1036516/"><img alt="Subsurface Geology and Oil and Gas Resources of Osage County, Oklahoma: Part 5. Townships 26 and 27 North Ranges 10 and 11 East" title="Subsurface Geology and Oil and Gas Resources of Osage County, Oklahoma: Part 5. Townships 26 and 27 North Ranges 10 and 11 East" src="https://digital.library.unt.edu/ark:/67531/metadc1036516/small/"/></a></p><p>This report is part of a series describing the structural features, the character of the oil- and gas-producing beds, and the localities where additional oil and gas may be found in parts of Osage County, Oklahoma. This part discusses the geology and resources in the northeastern part of the county.</p>Geology of Area Between Green and Colorado Rivers, Grand and San Juan Counties, Utah2017-10-25T14:26:56-05:00https://digital.library.unt.edu/ark:/67531/metadc1036544/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc1036544/"><img alt="Geology of Area Between Green and Colorado Rivers, Grand and San Juan Counties, Utah" title="Geology of Area Between Green and Colorado Rivers, Grand and San Juan Counties, Utah" src="https://digital.library.unt.edu/ark:/67531/metadc1036544/small/"/></a></p><p>From Abstract: "The area described in this report comprises about 900 square miles of arid land lying between the Green and Colorado Rivers south of the Denver & Rio Grande Western Railroad and southwest of the Salt Valley anticline. The rocks that crop out or that have been encountered in wells drilled in the are all sedimentary and range in age from Pennsylvania ti Upper Cretaceous. Mesizoic strata are especially well represented."</p>THE RECOVERY OF URANIUM FROM BYPRODUCT SCRAP MATERIALS2017-10-15T22:09:52-05:00https://digital.library.unt.edu/ark:/67531/metadc1017881/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc1017881/"><img alt="THE RECOVERY OF URANIUM FROM BYPRODUCT SCRAP MATERIALS" title="THE RECOVERY OF URANIUM FROM BYPRODUCT SCRAP MATERIALS" src="https://digital.library.unt.edu/ark:/67531/metadc1017881/small/"/></a></p><p>None</p>CORROSION OF THORIUM AND RELATED MATERIALS2017-10-15T22:09:52-05:00https://digital.library.unt.edu/ark:/67531/metadc1025327/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc1025327/"><img alt="CORROSION OF THORIUM AND RELATED MATERIALS" title="CORROSION OF THORIUM AND RELATED MATERIALS" src="https://digital.library.unt.edu/ark:/67531/metadc1025327/small/"/></a></p><p>None</p>Geology of the Kettleman Hills Oil Field, California: Stratigraphy, Paleontology, and Structure2017-07-30T08:43:19-05:00https://digital.library.unt.edu/ark:/67531/metadc784456/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc784456/"><img alt="Geology of the Kettleman Hills Oil Field, California: Stratigraphy, Paleontology, and Structure" title="Geology of the Kettleman Hills Oil Field, California: Stratigraphy, Paleontology, and Structure" src="https://digital.library.unt.edu/ark:/67531/metadc784456/small/"/></a></p><p>From Introduction: The field work that furnished the basis for this report was begun in 1930 and was continued at intervals until
1934. The anticlinal character of the Kettleman Hills is apparent to even the casual observer, but the many structural complications due to an intricate network of minor faults, at least in North Dome and Middle Dome, are much less obvious. Though it is improbable that these faults have any relation to the occurrence of oil, an attempt was made to map them, not only to
represent the structure adequately but also because the stratigraphy could not be understood if they were neglected. Faunal zones were particularly useful in mapping. On the other hand, some lithologic units proved to be more persistent than had been expected. The two sets of features-fossils and lithology-served as checks on each other.</p>An Autunite Deposit in the Rosamond Hills, Kern County, California2017-01-27T10:19:36-06:00https://digital.library.unt.edu/ark:/67531/metadc502064/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc502064/"><img alt="An Autunite Deposit in the Rosamond Hills, Kern County, California" title="An Autunite Deposit in the Rosamond Hills, Kern County, California" src="https://digital.library.unt.edu/ark:/67531/metadc502064/small/"/></a></p><p>From introduction: An autunite deposit in the SW 1/4 sec. 25, T. 10 N., R. 13 W. San Bernardino meridian, was visited by F. M. Chace on May 6 and 15, 1950. The deposit is about 100 yards west of a north-south country road and is at an altitude of approximately 2,775 feet. The autunite-bearing tuffaceous sandstone strikes N. 35-40 W. and dips 20 -25 SW. It has been traced about 40 feet along the strike at the base of the outcrop and for about 20 feet up the dip. Insufficient work was done to give an accurate idea of the size of the deposit or to determine if other autunite-bearing beds are present.</p>Spirit Leveling in South Carolina: Part 2. Southern South Carolina, 1896-19382017-01-14T22:15:59-06:00https://digital.library.unt.edu/ark:/67531/metadc304267/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc304267/"><img alt="Spirit Leveling in South Carolina: Part 2. Southern South Carolina, 1896-1938" title="Spirit Leveling in South Carolina: Part 2. Southern South Carolina, 1896-1938" src="https://digital.library.unt.edu/ark:/67531/metadc304267/small/"/></a></p><p>From introduction: This bulletin, which is published in two parts, contains the complete results of all spirit leveling done in South Carolina by the Geological Survey of the United States Department of the Interior, including those heretofore published.' The 34th parallel of latitude, passing through Columbia, serves to divide the State into two sections, each of which is represented by one of the parts of the bulletin. Part 1 deals with the section lying north of the 34th parallel, designated as northern South Carolina, and part 2 deals with the section lying south of that parallel, designated as southern
South Carolina. In each part descriptions of the points for which figures of elevation have been determined are listed according to the quadrangles in which the points occur, and the quadrangles are arranged in alphabetic order.</p>Shorter Contributions to General Geology, 19362016-09-15T23:48:09-05:00https://digital.library.unt.edu/ark:/67531/metadc872676/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc872676/"><img alt="Shorter Contributions to General Geology, 1936" title="Shorter Contributions to General Geology, 1936" src="https://digital.library.unt.edu/ark:/67531/metadc872676/small/"/></a></p><p>From abstract: This report describes four species of Ostreidae from the Upper Cretaceous of the Gulf region. The zones that the species characterize lie either in the upper part of the Austin chalk or in beds of upper Austin age.</p>Cooperative Grain Marketing by Local Warehouses and Elevators in the Pacific North West2016-02-03T11:42:51-06:00https://digital.library.unt.edu/ark:/67531/metadc799669/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc799669/"><img alt="Cooperative Grain Marketing by Local Warehouses and Elevators in the Pacific North West" title="Cooperative Grain Marketing by Local Warehouses and Elevators in the Pacific North West" src="https://digital.library.unt.edu/ark:/67531/metadc799669/small/"/></a></p><p>Bulletin discussing about the grain marketing techniques by the local warehouses and elevators in the pacific north west.</p>Report of the Chief of the Forest Service: 19402016-02-03T11:42:51-06:00https://digital.library.unt.edu/ark:/67531/metadc799754/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc799754/"><img alt="Report of the Chief of the Forest Service: 1940" title="Report of the Chief of the Forest Service: 1940" src="https://digital.library.unt.edu/ark:/67531/metadc799754/small/"/></a></p><p>Annual report from the U.S. Department of Agriculture Forest Service describing activities of the organization, expenditures and receipts, and a discussion of other relevant topics for the fiscal year.</p>Expenses Income and Dividends of Oklahoma and Texas Cooperative Cotton Gins2016-02-03T11:42:51-06:00https://digital.library.unt.edu/ark:/67531/metadc799743/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc799743/"><img alt="Expenses Income and Dividends of Oklahoma and Texas Cooperative Cotton Gins" title="Expenses Income and Dividends of Oklahoma and Texas Cooperative Cotton Gins" src="https://digital.library.unt.edu/ark:/67531/metadc799743/small/"/></a></p><p>Bulletin discussing about the income,expenses and dividends in Oklahoma and Texas during the seasons 1932-1933 to 1935-1936.</p>Report of the Twenty-Ninth National Conference on Weights and Measures, 19392015-01-19T05:58:23-06:00https://digital.library.unt.edu/ark:/67531/metadc100700/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc100700/"><img alt="Report of the Twenty-Ninth National Conference on Weights and Measures, 1939" title="Report of the Twenty-Ninth National Conference on Weights and Measures, 1939" src="https://digital.library.unt.edu/ark:/67531/metadc100700/small/"/></a></p><p>Report of the annual conference on weights and measures, hosted by the U.S. National Bureau of Standards in Washington D.C. It includes conference proceedings, a list of attendees, information about committees and officers, and other reports or commentaries discussed at the meetings.</p>Aerodynamic heating and the deflection of drops by an obstacle in an air stream in relation to aircraft icing2014-03-30T18:00:15-05:00https://digital.library.unt.edu/ark:/67531/metadc279564/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc279564/"><img alt="Aerodynamic heating and the deflection of drops by an obstacle in an air stream in relation to aircraft icing" title="Aerodynamic heating and the deflection of drops by an obstacle in an air stream in relation to aircraft icing" src="https://digital.library.unt.edu/ark:/67531/metadc279564/small/"/></a></p><p>From Summary: "Two topics of interest to persons attempting to apply the heat method of preventing ice formation on aircraft are considered. Surfaces moving through air at high speed are shown, both theoretically and experimentally, to be subject to important aerodynamic heating effects that will materially reduce the heat required to prevent ice. Numerical calculations of the path of water drops in an air stream around a circular cylinder are given. From these calculations, information is obtained on the percentage of the swept area cleared of drops."</p>FCC Reports, Volume 6, July 1, 1938 to February 28, 19392013-08-18T10:50:24-05:00https://digital.library.unt.edu/ark:/67531/metadc177287/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc177287/"><img alt="FCC Reports, Volume 6, July 1, 1938 to February 28, 1939" title="FCC Reports, Volume 6, July 1, 1938 to February 28, 1939" src="https://digital.library.unt.edu/ark:/67531/metadc177287/small/"/></a></p><p>Biweekly, comprehensive compilation of decisions, reports, public notices, and other documents of the U.S. Federal Communications Commission.</p>Safety Factors in Construction and Ventilation, Wawona Vehicular Tunnel, Yosemite National Park, California2013-02-28T19:56:32-06:00https://digital.library.unt.edu/ark:/67531/metadc66427/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc66427/"><img alt="Safety Factors in Construction and Ventilation, Wawona Vehicular Tunnel, Yosemite National Park, California" title="Safety Factors in Construction and Ventilation, Wawona Vehicular Tunnel, Yosemite National Park, California" src="https://digital.library.unt.edu/ark:/67531/metadc66427/small/"/></a></p><p>Report issued by the Bureau of Mines discussing the safety and ventilation hazards presented during the construction of the Wawona tunnel in Yosemite National Park. Safety precautions and procedures used during the construction are presented. This report includes tables, illustrations, and photographs.</p>Explosion Hazards in Storage-Battery Rooms2013-02-28T19:56:32-06:00https://digital.library.unt.edu/ark:/67531/metadc66435/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc66435/"><img alt="Explosion Hazards in Storage-Battery Rooms" title="Explosion Hazards in Storage-Battery Rooms" src="https://digital.library.unt.edu/ark:/67531/metadc66435/small/"/></a></p><p>Report issued by the Bureau of Mines discussing the safety and explosion hazards present in storage-battery rooms. Descriptions of storage-battery rooms and methods of ventilation are presented. This report includes tables, illustrations, and photographs.</p>Correlation Index to Aid in Interpreting Crude-Oil Analyses2013-02-28T19:56:32-06:00https://digital.library.unt.edu/ark:/67531/metadc66431/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc66431/"><img alt="Correlation Index to Aid in Interpreting Crude-Oil Analyses" title="Correlation Index to Aid in Interpreting Crude-Oil Analyses" src="https://digital.library.unt.edu/ark:/67531/metadc66431/small/"/></a></p><p>Report issued by the Bureau of Mines discussing the correlation index used for analyses of crude oils. The correlation index is presented and described in detail. This report includes tables, and illustrations.</p>Phenomena in the Ignition of Firedamp by Explosives: Part 1.-- Particles from the Detonation2013-02-28T19:56:32-06:00https://digital.library.unt.edu/ark:/67531/metadc66419/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc66419/"><img alt="Phenomena in the Ignition of Firedamp by Explosives: Part 1.-- Particles from the Detonation" title="Phenomena in the Ignition of Firedamp by Explosives: Part 1.-- Particles from the Detonation" src="https://digital.library.unt.edu/ark:/67531/metadc66419/small/"/></a></p><p>Report issued by the Bureau of Mines discussing the ignition of firedamp by coal-mining explosives. Experiments conducted to study the ignition of these particles are described. This report includes tables, illustrations, and photographs.</p>Quarry Accidents in the United States During the Calendar Year 19372012-08-31T21:48:36-05:00https://digital.library.unt.edu/ark:/67531/metadc38785/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc38785/"><img alt="Quarry Accidents in the United States During the Calendar Year 1937" title="Quarry Accidents in the United States During the Calendar Year 1937" src="https://digital.library.unt.edu/ark:/67531/metadc38785/small/"/></a></p><p>Report issued by the Bureau of Mines over quarry accidents in the U.S. during 1937. The number, type, and location of the accidents are presented and discussed. This report includes tables.</p>Mineral Industries Survey of the United States, California: Tuolumne and Mariposa Counties, Mother Lode District (South). Mines of the Southern Mother Lode Region, Part 2 -- Tuolumne and Mariposa Counties2012-08-31T21:48:36-05:00https://digital.library.unt.edu/ark:/67531/metadc38783/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc38783/"><img alt="Mineral Industries Survey of the United States, California: Tuolumne and Mariposa Counties, Mother Lode District (South). Mines of the Southern Mother Lode Region, Part 2 -- Tuolumne and Mariposa Counties" title="Mineral Industries Survey of the United States, California: Tuolumne and Mariposa Counties, Mother Lode District (South). Mines of the Southern Mother Lode Region, Part 2 -- Tuolumne and Mariposa Counties" src="https://digital.library.unt.edu/ark:/67531/metadc38783/small/"/></a></p><p>Report issued by the Bureau of Mines over mining operations in the southern Mother Lode Region of California. A review of this area is presented, and discussed. This report includes tables, illustrations, and photographs.</p>Soil Defense in the Pacific Southwest2012-08-14T16:17:07-05:00https://digital.library.unt.edu/ark:/67531/metadc97285/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc97285/"><img alt="Soil Defense in the Pacific Southwest" title="Soil Defense in the Pacific Southwest" src="https://digital.library.unt.edu/ark:/67531/metadc97285/small/"/></a></p><p>"The Pacific Southwest, as considered in this bulletin, embraces the two States -- California and Nevada. Evidences of soil and water losses are briefly touched upon, as are the factors contributing to these losses. The bulk of the bulletin deals with measures of defense that are now being employed on farms and range land within project areas of the Soil Conservation Service and in areas where members of Civilian Conservation Corps camps have been assigned to erosion-control activities." -- p. i. Some of the measures discussed include the use of cover crops, contour farming, crop rotation, subsoiling, strip cropping, and terracing.</p>Small Irrigation Pumping Plants2012-08-14T16:17:07-05:00https://digital.library.unt.edu/ark:/67531/metadc97286/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc97286/"><img alt="Small Irrigation Pumping Plants" title="Small Irrigation Pumping Plants" src="https://digital.library.unt.edu/ark:/67531/metadc97286/small/"/></a></p><p>"Throughout the United States are many farms, parts or all of which could be irrigated by pumping from either ponds or streams or farm wells. This bulletin is intended to furnish owners or operators of such farms with information that will give them some indication of initial and operating costs and enable them to determine whether soil and water suitable for irrigation are available and what kind of irrigation plant and equipment will be most satisfactory for their purpose. Having examined these factors, a farmer can decide whether irrigation is likely to be profitable on his farm." -- p. i</p>Stock-Water Developments: Wells, Springs, and Ponds2012-08-14T16:17:07-05:00https://digital.library.unt.edu/ark:/67531/metadc97287/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc97287/"><img alt="Stock-Water Developments: Wells, Springs, and Ponds" title="Stock-Water Developments: Wells, Springs, and Ponds" src="https://digital.library.unt.edu/ark:/67531/metadc97287/small/"/></a></p><p>"The need for effective utilization of grazing areas and the scarcity of stock water have led to unprecedented activity in the development of water supplies during the last few years as a part of conservation practices in range and pasture areas. Economical construction, planned distribution, and adequacy of stock-watering centers are essential to profitable grazing enterprises. Inadequate coordination of stock-water developments with necessary conservation practices and the improper location or construction of these facilities have made many water supplies unsatisfactory. This bulletin deals with the requirements and development of stock-water supplies suitable for grazing areas." -- p. ii</p>Cattle-Fever Ticks and Methods of Eradication2012-08-14T16:17:07-05:00https://digital.library.unt.edu/ark:/67531/metadc97225/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc97225/"><img alt="Cattle-Fever Ticks and Methods of Eradication" title="Cattle-Fever Ticks and Methods of Eradication" src="https://digital.library.unt.edu/ark:/67531/metadc97225/small/"/></a></p><p>Revised edition. This bulletin discusses the cattle-fever tick and methods for controlling it. Possible methods include dipping, pasture rotation, and arsenical dips. The life history of the tick is also discussed and instructions for constructing a concrete vat are given.</p>The Wheat Jointworm and Its Control2012-08-07T13:52:45-05:00https://digital.library.unt.edu/ark:/67531/metadc96585/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc96585/"><img alt="The Wheat Jointworm and Its Control" title="The Wheat Jointworm and Its Control" src="https://digital.library.unt.edu/ark:/67531/metadc96585/small/"/></a></p><p>Revised edition. "The wheat jointworm is a very small grub which lives in stems of wheat, feeding on the juices of the plant and causing a slight swelling or distortion of the stem above the joint. The egg from which it hatches is laid in the stem by an insect resembling a small black ant with wings. This insect attacks wheat only. The injury which it causes to wheat is very distinct from that caused by the Hessian fly, yet the effects caused by these two insects are often confused by farmers." -- p. 1-2. This bulletin gives a brief outline of the life cycle and the nature of the injury to the plant by the jointworm so that any farmer may readily recognize its work and be able to apply the measures of control herein recommended.</p>Lathes2012-08-07T13:52:45-05:00https://digital.library.unt.edu/ark:/67531/metadc96655/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc96655/"><img alt="Lathes" title="Lathes" src="https://digital.library.unt.edu/ark:/67531/metadc96655/small/"/></a></p><p>A guide to the operation and maintenance of lathes for general shop work.</p>Grinding machines2012-08-07T13:52:45-05:00https://digital.library.unt.edu/ark:/67531/metadc96656/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc96656/"><img alt="Grinding machines" title="Grinding machines" src="https://digital.library.unt.edu/ark:/67531/metadc96656/small/"/></a></p><p>This report provides the definition of grinding and discusses different processes, types, and operations of grinding.</p>Stemming in Metal Mines. Progress Report 22012-06-04T12:42:25-05:00https://digital.library.unt.edu/ark:/67531/metadc38434/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc38434/"><img alt="Stemming in Metal Mines. Progress Report 2" title="Stemming in Metal Mines. Progress Report 2" src="https://digital.library.unt.edu/ark:/67531/metadc38434/small/"/></a></p><p>Report issued by the U.S. Bureau of Mines on the progress made in metal-mine stemming. Different types of stemming methods and testing procedures are presented. This report includes tables, illustrations, and photographs.</p>Stress Distribution in and Equivalent Width of Flanges of Wide, Thin-Wall Steel Beams2011-11-17T22:13:23-06:00https://digital.library.unt.edu/ark:/67531/metadc56464/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc56464/"><img alt="Stress Distribution in and Equivalent Width of Flanges of Wide, Thin-Wall Steel Beams" title="Stress Distribution in and Equivalent Width of Flanges of Wide, Thin-Wall Steel Beams" src="https://digital.library.unt.edu/ark:/67531/metadc56464/small/"/></a></p><p>"The use of different forms of wide-flange, thin-wall steel beams is becoming increasingly widespread. Part of the information necessary for a national design of such members is the knowledge of the stress distribution in and the equivalent width of the flanges of such beams. This problem is analyzed in this paper on the basis of the theory of plane stress. As a result, tables and curves are given from which the equivalent width of any given beam can be read directly for use in practical design" (p. 1).</p>Analysis of Wind-Tunnel Data on Directional Stability and Control2011-11-17T22:13:23-06:00https://digital.library.unt.edu/ark:/67531/metadc59650/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc59650/"><img alt="Analysis of Wind-Tunnel Data on Directional Stability and Control" title="Analysis of Wind-Tunnel Data on Directional Stability and Control" src="https://digital.library.unt.edu/ark:/67531/metadc59650/small/"/></a></p><p>From Summary: "This paper does not attempt to establish criterions for directional stability and control; rather, the emphasis is placed on providing some basis for design to specified criterions. An example applying the design methods has been included."</p>Analysis and Prediction of Longitudinal Stability of Airplanes2011-11-17T22:13:23-06:00https://digital.library.unt.edu/ark:/67531/metadc66372/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc66372/"><img alt="Analysis and Prediction of Longitudinal Stability of Airplanes" title="Analysis and Prediction of Longitudinal Stability of Airplanes" src="https://digital.library.unt.edu/ark:/67531/metadc66372/small/"/></a></p><p>From Introduction: "The present report presents the results of such an analysis as regards the longitudinal-stability and control characteristics of the various airplanes tested."</p>Propeller analysis from experimental data2011-11-17T22:13:23-06:00https://digital.library.unt.edu/ark:/67531/metadc66373/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc66373/"><img alt="Propeller analysis from experimental data" title="Propeller analysis from experimental data" src="https://digital.library.unt.edu/ark:/67531/metadc66373/small/"/></a></p><p>The operation of the propeller is analyzed by the use of the distribution of forces along the radius, combined with theoretical equations. The data were obtained in the NACA 20-foot wind tunnel on a 4-foot-diameter, two-blade propeller, operating in front of four body shapes, ranging from a small shaft to support the propeller to conventional NACA cowling. A method of estimating the axial and the rotational energy in the wake as a fractional part of the propeller power is given. A knowledge of the total thrust and torque is necessary for the estimation.</p>An Analysis of the Stability of an Airplane With Free Controls2011-11-17T22:13:23-06:00https://digital.library.unt.edu/ark:/67531/metadc66370/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc66370/"><img alt="An Analysis of the Stability of an Airplane With Free Controls" title="An Analysis of the Stability of an Airplane With Free Controls" src="https://digital.library.unt.edu/ark:/67531/metadc66370/small/"/></a></p><p>Report presents the results of an investigation made of the essentials to the stability of an airplane with free control surfaces.</p>Preignition characteristics of several fuels under simulated engine conditions2011-11-17T22:13:23-06:00https://digital.library.unt.edu/ark:/67531/metadc66371/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc66371/"><img alt="Preignition characteristics of several fuels under simulated engine conditions" title="Preignition characteristics of several fuels under simulated engine conditions" src="https://digital.library.unt.edu/ark:/67531/metadc66371/small/"/></a></p><p>"The preignition characteristics of a number of fuels have been studied under conditions similar to those encountered in an engine. These conditions were simulated by suddenly compressing a fuel-air mixture in contact with an electrically heated hot spot in the cylinder head of the NACA combustion apparatus. Schlieren photographs and indicator cards were taken of the burning, and the hot-spot temperatures necessary to cause ignition under various conditions were determined" (p. 121).</p>Free-spinning wind-tunnel tests of a low-wing monoplane with systematic changes in wings and tails V: effect of airplane relative density2011-11-17T22:13:23-06:00https://digital.library.unt.edu/ark:/67531/metadc66351/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc66351/"><img alt="Free-spinning wind-tunnel tests of a low-wing monoplane with systematic changes in wings and tails V: effect of airplane relative density" title="Free-spinning wind-tunnel tests of a low-wing monoplane with systematic changes in wings and tails V: effect of airplane relative density" src="https://digital.library.unt.edu/ark:/67531/metadc66351/small/"/></a></p><p>The reported tests are a continuation of an NACA investigation being made in the free-spinning wind tunnel to determine the effects of independent variations in load distribution, wing and tail arrangement, and control disposition on the spin characteristics of airplanes. The standard series of tests was repeated to determine the effect of airplane relative density. Tests were made at values of the relative-density parameter of 6.8, 8.4 (basic), and 12.0; and the results were analyzed. The tested variations in the relative-density parameter may be considered either as variations in the wing loading of an airplane spun at a given altitude, with the radii of gyration kept constant, or as a variation of the altitude at which the spin takes place for a given airplane. The lower values of the relative-density parameter correspond to the lower wing loadings or to the lower altitudes of the spin.</p>A theoretical study of lateral stability with an automatic pilot2011-11-17T22:13:23-06:00https://digital.library.unt.edu/ark:/67531/metadc66353/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc66353/"><img alt="A theoretical study of lateral stability with an automatic pilot" title="A theoretical study of lateral stability with an automatic pilot" src="https://digital.library.unt.edu/ark:/67531/metadc66353/small/"/></a></p><p>"The influence of automatic operation of the aileron and rudder controls on the lateral stability of an airplane is discussed. The control deflections are assumed to be proportional to the deviations and to the rates of deviation of the airplane from steady-flight conditions. The effects of changes in the types of deviation governing control application are considered. For one simple method of control in which the aileron deflection is proportional to the angle of bank and the rudder deflection is proportional to the angle of yaw, the effect of lag in control application is studied and regions of stability with and without lag are given" (p. 273).</p>The Calculated Effect of Various Hydrodynamic and Aerodynamic Factors on the Take-Off of a Large Flying Boat2011-11-17T22:13:23-06:00https://digital.library.unt.edu/ark:/67531/metadc66362/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc66362/"><img alt="The Calculated Effect of Various Hydrodynamic and Aerodynamic Factors on the Take-Off of a Large Flying Boat" title="The Calculated Effect of Various Hydrodynamic and Aerodynamic Factors on the Take-Off of a Large Flying Boat" src="https://digital.library.unt.edu/ark:/67531/metadc66362/small/"/></a></p><p>Report presents the results of an investigation made to determine the influence of various factors on the take-off performance of a hypothetical large flying boat by means of take-off calculations. The factors varied in the calculations were size of hull (load coefficient), wing setting, trim, deflection of flap, wing loading, aspect ratio, and parasite drag. The take-off times and distances were calculated to the stalling speeds and the performance above these speeds was separately studied to determine piloting technique for optimum take-off.</p>A high-speed motion-picture study of normal combustion, knock and preignition in a spark-ignition engines2011-11-17T22:13:23-06:00https://digital.library.unt.edu/ark:/67531/metadc66365/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc66365/"><img alt="A high-speed motion-picture study of normal combustion, knock and preignition in a spark-ignition engines" title="A high-speed motion-picture study of normal combustion, knock and preignition in a spark-ignition engines" src="https://digital.library.unt.edu/ark:/67531/metadc66365/small/"/></a></p><p>Combustion in a spark-ignition engine was investigated by means of the NACA high-speed motion-picture cameras. This camera is operated at a speed of 40,000 photographs a second and therefore makes possible the study of changes that take place in the intervals as short as 0.000025 second. When the motion pictures are projected at the normal speed of 16 frames a second, any rate of movement shown is slowed down 2500 times. Photographs are presented of normal combustion, of combustion from preignitions, and of knock both with and without preignition. The photographs of combustion show that knock may be preceded by a period of exothermic reaction in the end zone that persists for a time interval of as much as 0.0006 second. The knock takes place in 0.00005 second or less.</p>Wind-tunnel investigation of effect of interference on lateral-stability characteristics of four NACA 23012 wings, an elliptical and a circular fuselage and vertical fins2011-11-17T22:13:23-06:00https://digital.library.unt.edu/ark:/67531/metadc66366/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc66366/"><img alt="Wind-tunnel investigation of effect of interference on lateral-stability characteristics of four NACA 23012 wings, an elliptical and a circular fuselage and vertical fins" title="Wind-tunnel investigation of effect of interference on lateral-stability characteristics of four NACA 23012 wings, an elliptical and a circular fuselage and vertical fins" src="https://digital.library.unt.edu/ark:/67531/metadc66366/small/"/></a></p><p>Report presents the results of a wind-tunnel investigation of the effect of wing-fuselage interference on lateral-stability characteristics made in the NACA 7 by 10-foot wind tunnel on four fuselages and two fins, representing high-wing, low-wing, and midwing monoplanes. The fuselages are of circular and elliptical cross section. The wings have rounded tips and, in plan form, one is rectangular and the three are tapered 3:1 with various amounts of sweep. The rate of change in the coefficients of rolling moment, yawing moment, and lateral force with angle of yaw is given in a form to show the increment caused by wing-fuselage interference for the model with no fin and the effect of wing-fuselage interference on fin effectiveness. Results for the fuselage-fin combination and the wing tested alone are also given.</p>Design Charts Relating to the Stalling of Tapered Wings2011-11-17T22:13:23-06:00https://digital.library.unt.edu/ark:/67531/metadc66363/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc66363/"><img alt="Design Charts Relating to the Stalling of Tapered Wings" title="Design Charts Relating to the Stalling of Tapered Wings" src="https://digital.library.unt.edu/ark:/67531/metadc66363/small/"/></a></p><p>An aid in airplane design, charts have been prepared to show the effects of wing taper, thickness ratio, and Reynolds number on the spanwise location of the initial stalling point. Means of improving poor stalling characteristics resulting from certain combinations of the variables have also been considered; additional figures illustrate the influence of camber increase to the wing tips, washout, central sharp leading edges, and wing-tip slots on the stalling characteristics. Data are included from which the drag increases resulting from the use of these means can be computed. The application of the data to a specific problem is illustrated by an example.</p>Tensile Elastic Properties of Typical Stainless Steels and Nonferrous Metals as Affected by Plastic Deformation and by Heat Treatment2011-11-17T22:13:23-06:00https://digital.library.unt.edu/ark:/67531/metadc66356/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc66356/"><img alt="Tensile Elastic Properties of Typical Stainless Steels and Nonferrous Metals as Affected by Plastic Deformation and by Heat Treatment" title="Tensile Elastic Properties of Typical Stainless Steels and Nonferrous Metals as Affected by Plastic Deformation and by Heat Treatment" src="https://digital.library.unt.edu/ark:/67531/metadc66356/small/"/></a></p><p>A general discussion is given of the relationships between stress, strain, and permanent set. From stress-set curves are derived proof stresses based on five different percentages of permanent set. The influence of prior plastic extension on these values is illustrated and discussed. A discussion is given of the influence of work-hardening, rest interval, and internal stress on the form of the proof stress-extension curve.</p>Investigations on the Incompletely Developed Plane Diagonal-Tension Field2011-11-17T22:13:23-06:00https://digital.library.unt.edu/ark:/67531/metadc66357/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc66357/"><img alt="Investigations on the Incompletely Developed Plane Diagonal-Tension Field" title="Investigations on the Incompletely Developed Plane Diagonal-Tension Field" src="https://digital.library.unt.edu/ark:/67531/metadc66357/small/"/></a></p><p>This report presents the results of an investigation on the incompletely developed diagonal-tension field. Actual diagonal-tension beams work in an intermediate stage between pure shear and pure diagonal tension; the theory developed by Wagner for diagonal tension is not directly applicable.</p>Wind-Tunnel Investigation of Spoiler, Deflector, and Slot Lateral-Control Devices on Wings With Full-Span Split and Slotted Flaps2011-11-17T22:13:23-06:00https://digital.library.unt.edu/ark:/67531/metadc66367/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc66367/"><img alt="Wind-Tunnel Investigation of Spoiler, Deflector, and Slot Lateral-Control Devices on Wings With Full-Span Split and Slotted Flaps" title="Wind-Tunnel Investigation of Spoiler, Deflector, and Slot Lateral-Control Devices on Wings With Full-Span Split and Slotted Flaps" src="https://digital.library.unt.edu/ark:/67531/metadc66367/small/"/></a></p><p>Report presents the results of an extensive investigation made in the NACA 7 by 10-foot wind tunnel of spoiler, deflector, and slot types of lateral-control device on wings with full-span split and slotted flaps. The static rolling and yawing moments were determined for all the devices tested, and the static hinge moments and the time response were determined for a few devices of each type.</p>Determination of ground effect from tests of a glider in towed flight2011-11-17T22:13:23-06:00https://digital.library.unt.edu/ark:/67531/metadc66355/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc66355/"><img alt="Determination of ground effect from tests of a glider in towed flight" title="Determination of ground effect from tests of a glider in towed flight" src="https://digital.library.unt.edu/ark:/67531/metadc66355/small/"/></a></p><p>Report presents the results of an investigation made to find the effect of ground on the aerodynamic characteristics of a Franklin PS-2 glider. The lift, the drag, and the angle of attack of the glider in towed flight were determined at several heights from 0.14 to 1.19 span lengths and at various speeds for each height. Two wing arrangements were tested: the plain wing, and the wing with a nearly full-span 30-percent-chord split flap deflected 45 degrees. The experimental results for the plain wing were in good agreement with theoretical values calculated by the method of Wieselsberger for both the angle of attack and the drag coefficient at a height of 0.21 span length; Tani's refinements of the theory had a practically negligible effect on the computed values in this case.</p>Annual Report of the National Advisory Committee for Aeronautics (25th). Administrative Report Including Technical Report Nos. 645 to 6802011-11-17T22:13:23-06:00https://digital.library.unt.edu/ark:/67531/metadc66339/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc66339/"><img alt="Annual Report of the National Advisory Committee for Aeronautics (25th). Administrative Report Including Technical Report Nos. 645 to 680" title="Annual Report of the National Advisory Committee for Aeronautics (25th). Administrative Report Including Technical Report Nos. 645 to 680" src="https://digital.library.unt.edu/ark:/67531/metadc66339/small/"/></a></p><p>Report includes the National Advisory Committee for Aeronautics letter of submittal to the President, summaries of the committee's activities and research accomplished, bibliographies, and financial report.</p>Piston temperatures in an air-cooled engine for various operating conditions2011-11-17T22:13:23-06:00https://digital.library.unt.edu/ark:/67531/metadc66358/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc66358/"><img alt="Piston temperatures in an air-cooled engine for various operating conditions" title="Piston temperatures in an air-cooled engine for various operating conditions" src="https://digital.library.unt.edu/ark:/67531/metadc66358/small/"/></a></p><p>As part of a program for the study of piston cooling, this report presents the results of tests conducted on a single-cylinder, air-cooled, carburetor engine to determine the effect of engine operating conditions on the temperatures at five locations on the piston.</p>Preliminary investigation of the flying qualities of airplanes2011-11-17T22:13:23-06:00https://digital.library.unt.edu/ark:/67531/metadc66360/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc66360/"><img alt="Preliminary investigation of the flying qualities of airplanes" title="Preliminary investigation of the flying qualities of airplanes" src="https://digital.library.unt.edu/ark:/67531/metadc66360/small/"/></a></p><p>"The National Advisory Committee for Aeronautics is undertaking an investigation of the flying qualities of airplanes. The work consists in the determination of the significant qualities susceptible of measurement, the development of the instruments required to make the measurements, and the accumulation of data on the flying qualities of existing airplanes, which data are to serve as a basis for quantitative specifications for the flying qualities of future designs" (p. 449).</p>Pressure available for cooling with cowling flaps2011-11-17T22:13:23-06:00https://digital.library.unt.edu/ark:/67531/metadc66381/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc66381/"><img alt="Pressure available for cooling with cowling flaps" title="Pressure available for cooling with cowling flaps" src="https://digital.library.unt.edu/ark:/67531/metadc66381/small/"/></a></p><p>Report presents the results of a full-scale investigation conducted in the NACA 20-foot tunnel to determine the pressure difference available for cooling with cowling flaps. The flaps were applied to an exit slot of smooth contour at 0 degree flap angle. Flap angles of 0 degree, 15 degrees, and 30 degrees were tested. Two propellers were used; propeller c which has conventional round blade shanks and propeller f which has airfoil sections extending closer to the hub. The pressure available for cooling is shown to be a direct function of the thrust disk-loading coefficient of the propeller.</p>