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Aerodynamic Characteristics of Airfoils 6: Continuation of Reports Nos. 93, 124, 182, 244, and 286
"This collection of data on airfoils has been made from the published reports of a number of the leading aerodynamic laboratories of this country and Europe. The information which was originally expressed according to the different customs of the several laboratories is here presented in a uniform series of charts and tables suitable for use of designing engineers and for purposes of general reference. The authority for the results here presented is given as the name of the laboratory at which the experiments were conducted, with the size of the model, wind velocity, and year of test" (p. 213).
Aerodynamic Characteristics of Twenty-Four Airfoils at High Speeds
"If a propeller is mounted directly on the of a modern high-speed airplane engine, the outer airfoil sections of the propeller travel at speeds approaching the speed of sound. It is possible by the use of gearing and a somewhat larger propeller to reduce the speed of the propeller sections, but only at the expense of additional weight and some frictional loss of power. This report presents the results of this work" (p. 327).
Agglomeration and Leaching of Slimes and Other Finely Divided Ores
Report discussing the loads and extracting of slime and other divided ores. The report discusses experimental work done on the materials.
Aircraft Woods: Their Properties, Selection, and Characteristics
From Summary: "This report presents, further, information on the properties of various other native species of wood compared with spruce, and discusses the characteristics of a considerable number of them from the standpoint of their possible application in aircraft manufacture to supplement the woods that are now most commonly used."
Annual Report of the National Advisory Committee for Aeronautics (15th). Administrative Report Including Technical Reports Nos. 309 to 336
Report includes the National Advisory Committee for Aeronautics letter of submittal to the President, Congressional report, summaries of the committee's activities and research accomplished, bibliographies, and financial report.
The Chakachamna-Stony Region, Alaska
A report on the exploration and survey of the Chakachamna-Stony Region of Alaska.
Coal-Mine Fatalities in the United States, 1928
Report compiled by the U.S. Bureau of Mines including statistics on fatalities in coal mines located in the United States as well as data regarding the various operations (e.g., number of miners employed and average production). The information is organized into tables for comparison and the text draws some overall conclusions in the summary.
Coefficients of Flow of Standard Nozzles
We first undertook experiments with air, devoted principally to the investigation of the disturbances due to the differences in the nature of the flow to the nozzle. The difficulty of measuring the air, however, caused us to experiment with water. Due to the possibility of measuring the capacity of the container, this method was much more accurate than measuring with Pitot tobes.
Collection of wind-tunnel data on commonly used wing sections
This report groups in a uniform manner the aerodynamic properties of commonly used wing sections as determined from tests in various wind tunnels. The data have been collected from reports of a number of laboratories. Where necessary, transformation has been made to the absolute system of coefficients and tunnel wall interference corrections have been applied. Tables and graphs present the data in the various forms useful to the engineer in the selection of a wing section.
Combating Airplane Fires
This report provides a summary of the important steps to be taken in combating airplane fires. Some considerations and ways of preventing fires from developing are provided.
Commercial Possibilities of the Texas-New Mexico Potash Deposits
From Introduction Results of Test: "Among the domestic potash resources which were brought to the attention of the country during and after the war but were not utilized as a source of potash, although they indicated that they might furnish the cheap potash desired, were the potash deposits occurring with the think rock-salt formations of western Texas and southeastern New Mexico."
Construction and Operation of the Bureau of Mines Experimental Oil-Shale Plant, 1925-1927
Report describing the construction of the Bureau of Mines experimental oil-shale plant at Rulison, CO, during 1925 and 1926, its operation, and the results obtained from refinery studies of the oil produced.
Contribution to the Study of Normal Burning in Gaseous Carbureted Mixtures: Part 1
In the present study it is proposed to provide an equipment permitting the study of the propagation of the region of reaction in mixtures of air and carbureted gases enclosed within a cylinder. Ignition is produced at the end of compression by an electric spark. With this apparatus it is proposed to determine: 1) the influence of the richness of the explosive mixture on the rate of flame propagation; 2) the influence of the degree of volumetric compression on one of the hydrocarbons; 3) the influence of the variation of initial temperature of the mixture before compression; 4) the influence of tetraethyl-lead on the propagation - notably on the formation of the explosive wave.
Contribution to the Study of Normal Burning in Gaseous Carbureted Mixtures: Part 2
Memorandum presenting the experimental results of tests to confirm the contribution to the study of normal burning in gaseous carbureted mixtures.
Effect of Vacuum on Oil Wells
From Introduction: "Because of the above reasons, because there is a dearth of published information relating to the effect of vacuum oil wells, and because misapplication of vacuum may result in a greatly decreased ultimate recovery of oil, whereas the correct application may have the opposite effect, the Bureau of Mines has authorized this investigation."
Flight tests on U.S.S. Los Angeles. Part 2: stress and strength determination
From Summary: "The tests described in this report furnished data on the actual aerodynamic forces, and the resulting stresses and bending moments in the hull of the U. S. S. "Los Angeles" during as severe still-air maneuvers as the airship would normally be subjected to, and in straight flight during as rough air as is likely to occur in service, short of squall or storm conditions. The maximum stresses were found to be within the limits provided for in accepted practice in airship design. Normal flight in rough air was shown to produce forces and stresses about twice as great as the most severe still-air maneuvers."
Fuel Vapor Pressures and the Relation of Vapor Pressure to the Preparation of Fuel for Combustion in Fuel Injection Engines
"This investigation on the vapor pressure of fuels was conducted in connection with the general research on combustion in fuel injection engines. The purpose of the investigation was to study the effects of high temperatures such as exist during the first stages of injection on the vapor pressures of several fuels and certain fuel mixtures, and the relation of these vapor pressures to the preparation of the fuel for combustion in high-speed fuel injection engines" (p. 385).
Gas-Lift Method of Flowing Oil Wells: (California Practice)
From Introduction: "In this report the author has presented data of actual gas-lift operations in the oil fields of California. Wherever theoretical hypotheses and conclusions are given an attempt has been made to support them by field data gathered during consultation with engineers and operators. The impossibility of drawing conclusions that will apply to all wells or even to one well throughout its life is appreciated by everyone who has studied the subject, and the reader is cautioned not to accept all the data presented as being applicable to every well."
Geologic History of the Yosemite Valley
The principal result of the investigations upon which this report is based is the determination within narrow limits of the preglacial depth of the Yosemite Valley and of other facts concerning its preglacial development which permit fairly definite estimates of the proportionate shares of work performed by stream and by glacier. The investigations comprise a detailed survey of the glacial and geomorphologic features of the Yosemite region and an equally intensive study of its rock formations, supplemented by reconnaissance work of both kinds in adjoining parts of the Sierra Nevada.
Geology and Coal Resources of the Meeker Quadrangle, Moffat and Rio Blanco Counties, Colorado
From introduction: The investigations on which the greater part of this report is based were carried on by E. T. Hancock, the senior author, during the summer of 1911. They were undertaken by the United States Geological Survey under a comprehensive plan for collecting information about the undeveloped fuel resources of the Western States, both as a step toward the conservation of the coal resources of the United States and as a means of supplying the demand for information concerning the many valuable coal fields of the Western States.
Geology and Oil Resources Along the Southern Border of San Joaquin Valley, California
From abstract: The region described in this report includes a foothill belt of the San Emigdio and Tehachapi Mountains along the southern border of San Joaquin Valley. The belt displays portions of the rugged granitic cores of the mountains and also rocks of Eocene, Oligocene, Miocene, Pliocene, and Pleistocene age. Although there is thus a complete representation of the geologic series from the Eocene to the Pleistocene, some portions of the different series are wanting because of major faults and overlaps. The thickness of the Tertiary rocks (Eocene to Pliocene) varies considerably but has a maximum of about 29,000 feet. Miocene and Pliocene rocks cover most of the area investigated.
Geology of the Eastern Part of the Santa Monica Mountains, Los Angeles County, California
From abstract: The Santa Monica Mountains lie only a few miles northwest of the city of Los Angeles and comprise one of the prominent structural features that adjoin the Los Angeles Basin, one of the most prolific oil-producing districts of California. Even though the eastern part of these mountains may yield no oil, information concerning the rock types, structural character, and detailed geologic history of this area should be of value to petroleum geologists. The area described in this report, which lies between Topanga Canyon on the west and the Los Angeles River on the east, presents a section of varied rock types including coarsely crystalline plutonic rocks, basic and acidic intrusive and pyroclastic rocks, metamorphic slate and schist, and a wide assortment of sedimentary rocks.
Greensand Bibliography to 1930 (Annotated): with a Chapter on Zeolite Water Softeners
From Introduction: "The references given herein to the literature of greensand or glauconite are believed to be complete up to about the end of 1929. The aim in this bibliography has been to include with each important reference a short synopsis, generally checked against the original article. These synopses are believed to be sufficiently complete to present a general view of the original article, and in many items specific parts of the article are included."
Innovations in Copper Leaching Employing Ferric Sulphate-Sulphuric Acid
From Introduction: "The Bureau of Mines has attempted to develop a cheap and efficient solvent that would especially meet the requirements of smaller plants. (See Bibliography). A method of producing this solution from sulphurous products and waste liquors was developed by the bureau and tried successfully on a test-plant scale at the Southwest Experiment Station in cooperation with the department of mining and metallurgy, University of Arizona, Tuscon, Ariz."
Joint report on standardization tests on N.P.L. R.A.F 15 airfoil model
From Summary: "This report contains the wind-tunnel test data obtained in the United States on a 36 by 6 inch R.A.F. 15 airfoil model prepared by the British Aeronautical Research Committee for International Trials. Tests were made in cooperation with the National Advisory Committee for Aeronautics at the Bureau of Standards, Langley Memorial Aeronautical Laboratory, Massachusetts Institute of Technology, and McCook field. In addition to brief descriptions of the various wind tunnels and methods of testing, the report contains an analysis of the test data. It is shown that while in general the agreement is quite satisfactory there are two cases in which it is unsatisfactory."
Lithologic Studies of Fine-Grained Upper Cretaceous Sedimentary Rocks of the Black Hills Region
More than nine-tenths of the Upper Cretaceous rocks in northeastern Wyoming are fine-grained shales, mudstones, and calcareous marls. A comparative study of the mineralogy, chemical and mechanical composition, density and porosity, fissility, and lamination of samples of these rocks discloses several relations that throw light on the geologic history and structural deformation of the region, and perhaps on its oil and gas possibilities.
Metal-Mine Accidents in the United States During the Calendar Year 1928
Report issued by the U.S. Bureau of Mines covering accidents that happened in metal mines located in the United States including statistics for injuries, fatalities, kinds and causes of accidents, and operational data, such as number of mine workers and shifts worked.
Mining in the Fortymile District Alaska
Introduction: At the end of the field season the writer visited the mining plants in the Fortymile district, and this paper, resulting from these examinations, is intended mainly to sketch the present progress of mining development in the district.
Permissible Electric Mine Lamps
From Introduction: "This paper gives a brief account of the introduction of electric lighting in mines, reviews some of the preliminary and approval work on electric mine lamps up to July, 1917, when a previous bulletin on electric lamps was issued, and describes the lamp-approval work from that date of July, 1930."
Permissible Methane Detectors
From Function of Methane Detectors: "The object of this paper is to present to the mining public the results of the permissibility tests of the detectors that have been approved, also to give the results of a series of tests conducted to determine their practicability."
Petroleum Refinery Statistics: 1928
Report discussing statistics relating to the petroleum refinery industry in 1928.
Potash Bibliography to 1928 (Annotated): Review and Compilation of Technical Literature on Potash Salts (including the Alunites) and Their Foreign Occurrences
From Scope and Arrangement of Review: "This review is confined to the technical literature of the origin, history, and foreign occurrences of saline potassium minerals, their mining, description, treatment, and physical-chemical relations. The literature on alunite, jarosite, and related minerals has also been included. The literature on potash minerals associated with the nitrate deposits and on the silicate minerals has been omitted as well as that on analytical methods, statistics, political economy, and the very large field of patent literature. The material in this review is arranged chronologically and alphabetically according to the authors within each year."
Quarry Accidents in the United States During the Calendar Year 1928
Report published by the U.S. Bureau of Mines which is a compilation of accidents in quarries located in the United States with data regarding the number and kinds of accidents as well as information about the mining operations (e.g., number of men employed, kinds of quarries, amount of work performed, etc.).
Quaternary Geology of Minnesota and Parts of Adjacent States
Description of geology in Minnesota and explanations of glacial drift within the state an immediate surroundings (Wisconsin, Iowa, North Dakota and South Dakota) with sections detailing the movement of each glacier and relevant geological notes. Index starts on page 147.
Rate of Heat Transfer From Finned Metal Surfaces
The object was to evaluate the factors which control the rate of heat transfer to a moving current of air from finned metal surfaces similar to those used on aircraft engine cylinders. This was to establish data which will enable the finning of cooling surfaces to be designed to suit the particular needs of any specific application. Most of the work was done on flat copper specimens 6 inches square, upon which were mounted copper fins with spacings varying from 1/2 inch to 1/12 inch. All fins were 1 inch deep, 6 inches long, and .020 inch thick. The results of the investigation are given in the form of curves included here.
Refining of Light Petroleum Distillates
From Scope of Report: "The first part of this report deals with the principal methods of refining light petroleum products, the equipment used, and the effects of the different refining agents. The second part of the report deals with a study of the value of fractionation as an aid to the refining of pressure distillates."
Rock-Strata Gases of the Cripple Creek District, Colorado and Their Effect on Mining
From Introduction: "The presence in the Cripple Creek district, Colo., of irrespirable gas or gases, generally known to consist mainly of nitrogen and carbon dioxide, has been recognized by members of the mining industry in that region almost since underground mining was begun there; the occurrence origin, and possible control of these gases have been discussed in several articles cited at various places in this report. Similar gases have also been studied in other metal-mining districts, as later discussed."
Shorter Contributions to General Geology, 1929
From introduction: This report describes the deposits of analcite in the Green River formation, to compare them with other similar deposits, and to present them with other similar deposits, and to present the observations and inferences that led him to explain them as alteration products of volcanic ash that fell into an ancient saline lake. The report also records the occurrence of several thin beds of sepiolite, or meerschaum, in the Green River formation and presents new data on the molds of saline minerals of the Green River formation whose determination affects directly the interpretation of the analcite and sepiolite deposits.
Structural Details of the Giant Dornier Seaplane "Do X."
Memorandum presenting a description of the Dornier seaplane Do X. Details of the general description, materials, details of the main wing and upper wing, details of the hull and of the wing stubs, tail surfaces and control lines, power plant, and launching car and floating dock are provided.
Summarized Data of Silver Production
Report presenting information on the production of silver around the world.
Tests of Five Metal Model Propellers With Various Pitch Distributions in a Free Wind Stream and in Combination With Model VE-7 Fuselage
"This report describes the tests of five adjustable blade metal model propellers both in a free wind stream and in combination with a model fuselage with stub wings. The propellers are of the same form and cross section but have variations in radial distributions of pitch. By making a survey of the radial distribution of air velocity through the propeller plane of the model fuselage it was found that this velocity varies from zero at the hub center to approximately free stream velocity at the blade tip" (p. 501).
The Torsion of Members Having Sections Common in Aircraft Construction
"Within recent years a great variety of approximate torsion formulas and drafting-room processes have been advocated. In some of these, especially where mathematical considerations are involved, the results are extremely complex and are not generally intelligible to engineers. The principal object of this investigation was to determine by experiment and theoretical investigation how accurate the more common of these formulas are and on what assumptions they are founded and, if none of the proposed methods proved to be reasonable accurate in practice, to produce simple, practical formulas from reasonably correct assumptions, backed by experiment. A second object was to collect in readily accessible form the most useful of known results for the more common sections" (p. 675).
United States Earthquakes, 1928
Report discussing earthquake activity in the United States during 1928. The report is broken down by regions and has sections for specific earthquakes.
The Upper Cretaceous Floras of Alaska
From foreword: This report describes the upper cretaceous floras and rocks south of the Brooks Range in Alaska.
Ventilation of the Large Copper Mines of Arizona
Introduction: "This bulletin discusses ventilation methods, practices, and costs at 11 large copper mines in Arizona, as obtained by brief personal studies and from supplementary information furnished by the mine managements. These mines were visited from December, 1928, to November, 1929, and the methods and practices in use when visited are described in some detail."
The Weymann-Lepère W.E.L. 10 Observation Airplane (French): A High-Wing Monoplane
Circular presenting a description of the Weymann-Lepère W.E.L. 10. Some of the characteristics described include the principles of the construction, aerodynamics, descriptions of the components, flight characteristics, and photographs and blueprints.
Wind-Tunnel Tests on a Series of Wing Models Through a Large Angle of Attack Range Part 1: Force Tests
"This investigation covers force tests through a large range of angle of attack on a series of monoplane and biplane wing models. The tests were conducted in the atmospheric wind tunnel of the National Advisory Committee for Aeronautics. The models were arranged in such a manner as to make possible a determination of the effects of variations in tip shape, aspect ratio, flap setting, stagger, gap, decalage, sweep back, and airfoil profile. The arrangements represented most of the types of wing systems in use on modern airplanes" (p. 3).
Zinc Smelting from a Chemical and Thermodynamic Viewpoint
Report describing a chemical and thermodynamic overview of zinc smelting. The methods described are not new, but the analysis is deeper and more focused than in previous reports.
The Design of Airplane Wing Ribs
"The purpose of this investigation was to obtain information for use in the design of truss and plywood forms, particularly with reference to wing ribs. Tests were made on many designs of wing ribs, comparing different types in various sizes. Many tests were also made on parallel-chord specimens of truss and plywood forms in place of the actual ribs and on parts of wing ribs, such as truss diagonals and sections of cap strips" (p. 223).
Airfoil Pressure Distribution Investigation in the Variable Density Wind Tunnel
Report presents the results of wind tunnel tests of pressure distribution measurements over one section each of six airfoils. Pressure distribution diagrams, as well as the integrated characteristics of the airfoils, are given for both a high and a low dynamic scale or, Reynolds number VL/V, for comparison with flight and other wind-tunnel tests, respectively. It is concluded that the scale effect is very important only at angles of attack near the burble.
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