118 Matching Results

Search Results

Geology of the Santa Rita Mining Area, New Mexico

Description: From abstract: The Santa Rita mining area (pl. 1), covering 35 square miles of semiarid mountainous land, lies within the Silver City 30-minute quadrangle, Grant County, N. Mex., and includes the most productive part of the Central or Hanover mining district. Ore was produced in this district as early as 1804 and production continued intermittently for a century before the developments were undertaken that led to large-scale copper mining, which began in 1912. The output of zinc, lead, and iron increased markedly about the same time.
Date: 1935
Creator: Spencer, Arthur C. & Paige, Sidney
Partner: UNT Libraries Government Documents Department

The Contact Mining District, Nevada

Description: From abstract: This report summarizes the results of a reexamination, in 1930, of the Contact mining district, in Elko County, northern Nevada. A report published as a result of a visit in 1910 summarizes the major features of the geology of the district, and the principal new data in the present paper pertain to mining development occasioned by the completion of a railroad through the camp in 1925.
Date: 1935
Creator: Schrader, Frank C.
Partner: UNT Libraries Government Documents Department

Geology of the Tonsina District, Alaska

Description: From introduction: The purpose of this paper is to describe the geology and mineral resources of a part of the Copper River Basin between the Richardson Highway and the valley of the Klutina River, together with small areas east of the highway and west of the river. For convenience in reference this area is called the Tonsina district, as the Tonsina River and Tonsina Lake are conspicuous local geographic features, and the Tonsina Road House, on the highway at the crossing of the river, is one of the oldest and best-known settlements in the Copper River Basin.
Date: 1935
Creator: Moffit, Fred H.
Partner: UNT Libraries Government Documents Department

Geology of Big Horn County and the Crow Indian Reservation, Montana: with Special Reference to the Water, Coal, Oil and Gas Resources

Description: From introduction: This report contains information concerning the geology of Big Horn County and the Crow Indian Reservation and their resources in ground water, coal, oil, and gas. These facts were collected in the course of studies for about a dozen field projects, which ranged in character from reconnaissance studies of large areas to very detailed mapping of certain tracts to show the occurrence of oil and gas. Consequently, the information at hand, either as to the geology or the resources, is not equally complete and definite for all parts.
Date: 1935
Creator: Thom, W. T., Jr.; Hall, George Martin; Wegemann, Carroll H. & Moulton, G. F.
Partner: UNT Libraries Government Documents Department

Pre-Cambrian Rocks of the Lake Superior Region: A Review of Newly Discovered Geologic Features, with a Revised Geologic Map

Description: From abstract: Detailed knowledge of the geology of the pre-Cambrian rocks of the Lake Superior region has been greatly augmented since the publication of Monograph 52 by the United States Geological Survey in 1911. The authors have attempted in the present report to assemble as much of this new information as possible, and to give the reader a birdseye view of the geology as seen in the light of all studies made there up to the present time. Detailed descriptions are not presented, and the emphasis is placed upon the major problems of correlation. A revised map of the region, with cross sections, accompanies the report, bringing up to date a knowledge of the areal geology of the region, which otherwise could be gained only by consulting some 150 maps contained in almost as many separate local reports, many of which are unpublished.
Date: 1935
Creator: Leith, C. K.; Lund, Richard Jacob & Leith, Andrew
Partner: UNT Libraries Government Documents Department

The Willow Creek-Kashwitna District, Alaska

Description: From introduction: The district described in this report is a triangular area covering about 300 square miles in the southwestern part of the Talkeetna Mountains. The Kashwitna River forms the northern boundary, the Susitna Valley flats the western, and the Willow Creek gold district, which is in the extreme southwestern part of the Talkeetna Mountains, the southern. As the area examined is not a distinct geographic unit, its boundaries being arbitrarily chosen and set only by the limitation of time spent in the field, a description of its geography applies to practically the entire western and southern portions of the Talkeetna Mountains, of which it is a part.
Date: 1935
Creator: Capps, Stephen R. & Tuck, Ralph
Partner: UNT Libraries Government Documents Department

Lead and Zinc Mining and Milling in the United States: Current Practices and Costs

Description: From Object and Scope of Bulletin: "The purpose of this paper to combine in a single volume discussions of the winning of lead and zinc ores from the mines and of the milling of the ores with descriptions of practices at typical properties in the United States."
Date: 1935
Creator: Jackson, Charles F.; Knaebel, John B. & Wright, C. A.
Partner: UNT Libraries Government Documents Department

Engineering Factors in the Ventilation of Metal Mines

Description: From Introduction Purpose and Scope of Report: "In the belief that the quickest and cheapest method of obtaining effective ventilation of metal mines with regard to air conditions that promote efficiency, health, and safety is through more general application of the engineering factors involved rather than by trial and error and this method of attacking ventilation problems will be facilitated by a simple, concise statement of these factors and the methods of using them, an attempt is made in this bulletin to present the subject of metal-mine ventilation to mine operators in a practical way."
Date: 1935
Creator: McElroy, G. E.
Partner: UNT Libraries Government Documents Department

Quarry Accidents in the United States During the Calendar Year 1933

Description: 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.).
Date: 1935
Creator: Adams, William W. & Erwin, Virginia E.
Partner: UNT Libraries Government Documents Department

Coal-Mine Accidents in the United States, 1933

Description: Report compiled by the U.S. Bureau of Mines including statistics on fatal and non-fatal accidents 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.
Date: 1935
Creator: Adams, W. W. & Geyer, L. E.
Partner: UNT Libraries Government Documents Department

Contributions to the Data on Theoretical Metallurgy: [Part] 3. The Free Energies of Vaporization and Vapor Pressures of Inorganic Substances

Description: From Introduction: "It is the purpose of this present work (1) to apply the previously compiled entropy values and specific-heat equations to vapor-pressure and other pertinent data in obtaining heat and free energy of vaporization equations for inorganic substances valid up to the normal boiling or sublimation points (760 mm pressure), (2) to supplement wherever possible the data on heats and entropies of transformations and fusions, (3) to supplement wherever possible the data on heats and entropies of gases, and (4) to supply tables of vapor pressures for inorganic substances at various temperatures up to and including the boiling or sublimation point."
Date: 1935
Creator: Kelley, K. K.
Partner: UNT Libraries Government Documents Department

Contributions to the Data on Theoretical Metallurgy: [Part] 4. Metal Carbonates--Correlations ans Applications of Thermodynamic Properties

Description: From Introduction: "This publication proposes to assemble existing thermodynamic data for carbonates and to correlate so far as possible the results of decomposition-pressure determinations with the calorimetrically determined heats of formation and entropy values on the one hand and with solubility and standard electrode-potential data on the other."
Date: 1935
Creator: Kelley, K. K. & Anderson, C. T.
Partner: UNT Libraries Government Documents Department

Manufacture of Paraffin Wax from Petroleum

Description: From Introduction: "The primary purpose of this bulletin is to describe the metallurgical treatment and properties of the alloys as developed in research at the laboratories of the Bureau of Mines at Rolla, Mo., and to present a substantial amount of unpublished data."
Date: 1935
Creator: Espach, Ralph H.
Partner: UNT Libraries Government Documents Department

The Relative Hydrodynamic Resistance of Various Types of Rivet Heads from Tests of Planning Surfaces, Special Report

Description: The Committee was requested to investigate the effect of various types of rivet heads on hydrodynamic resistance. The proposal was made to obtain the resistance of the various types of rivets by tests of planing surfaces on which the full size rivets would be arranged. The testing methods, results and conclusions are given.
Date: July 1935
Creator: Truscott, Starr & Parksinson, John B.
Partner: UNT Libraries Government Documents Department

Ice Prevention on Aircraft by Means of Impregnated Leather Covers, Special Report

Description: The National Advisory Committee for Aeronautics is testing the effectiveness of a method to prevent the formation of ice on airplanes. The system makes use of a leather cover that is attached to the leading edge of the wing. A small tube, attached to the inner surface of the leather, distributes to the leading edge a solution that permeates throughout the leather and inhibits the formation of ice on the surface. About 25 pounds of the liquid per hour would be sufficient to prevent ice from forming on a wing of 50-foot span. The additional gross weight of the system will not be excessive. The tests are not yet completed but the method is thought to be practicable for the wing and it may also be adaptable to the propeller.
Date: August 1935
Creator: Clay, William C.
Partner: UNT Libraries Government Documents Department

Gliding in convection currents

Description: A survey of the possibilities of gliding in convection currents reveals that heretofore only the most simple kind of ascending convection currents, that is, the "thermic" of insolation, has been utilized to any extent. With the increasing experience in gliding, the utilization of the peculiar nature of the "wind thermic" and increased glider speed promises further advances. Evening, ocean, and height "thermic" are still in the exploration stage, and therefore not amenable to survey in their effects.
Date: January 1, 1935
Creator: Georgii, W
Partner: UNT Libraries Government Documents Department

The interdependence of profile drag and lift with Joukowski type and related airfoils

Description: On the basis of a systematic investigation of Gottingen wind-tunnel data on Joukowski type and related airfoils, it is shown in what manner the profile drag coefficient is dependent on the lift coefficient. The individual factors for the construction of the profile drag polars are given. They afford a more accurate calculation of the performance coefficients of airplane designs than otherwise attainable with the conventional assumption of constant drag coefficient.
Date: March 1, 1935
Creator: Muttray, H
Partner: UNT Libraries Government Documents Department

Modification of wing-section shape to assure a predetermined change in pressure distribution

Description: In order to find an airfoil for a predetermined pressure distribution, the problem must be posed so that the pressure distribution creates no drag. Another fundamental difficulty is that it is impossible to specify a pressure distribution without first knowing the place where these pressures are to be applied, i.e., the wing-section shape. This difficulty may be avoided by directing the pressure distribution along the contour of the wing section. Then it becomes possible to define the change in wing-section shape which effects a certain modification of the wing-section shape. The limitations underlying the required pressure distribution are discussed and it is found that the sole essential limitation is zero drag. The method is illustrated with an example.
Date: March 1935
Creator: Betz, A.
Partner: UNT Libraries Government Documents Department

The aeronautical laboratory of the Stockholm Technical Institute

Description: This report presents a detailed analysis and history of the construction and operation of the aeronautical laboratory of the Stockholm Technical Institute. Engines and balances are discussed and experimental results are also given.
Date: March 1935
Creator: Malmer, Ivar
Partner: UNT Libraries Government Documents Department

The 1934 contest for the Deutsch de la Meurthe trophy

Description: This report presents a description of the rules, history and new technical innovations in the Deutsch de la Meurthe Cup race of 1934.
Date: February 1935
Creator: Leglise, Pierre
Partner: UNT Libraries Government Documents Department

The aerodynamic aspect of wing-fuselage fillets

Description: Report discussing model tests prove the feasibility of enhancing the aerodynamic qualities of wing-fuselage fillets by appropriate design of fuselage and wing roots. Abrupt changes from maximum fuselage height to wing chord must be avoided and every longitudinal section of fuselage and wing roots must be so faired and arranged as to preserve the original lift distribution of the continuous wing. Adapting the fuselage to the curvilinear circulation of the wing affords further improvement. The polars of such arrangements are almost the same as those of the "wing alone," thus voiding the superiority of the high-wing type airplane known with conventional design.
Date: February 1935
Creator: Muttray, H
Partner: UNT Libraries Government Documents Department