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  Partner: UNT Libraries Government Documents Department
 Decade: 1920-1929
 Year: 1920
 Collection: Technical Report Archive and Image Library
Abstracts of Current Decisions on Mines and Mining: May to August, 1919

Abstracts of Current Decisions on Mines and Mining: May to August, 1919

Date: 1920
Creator: Thompson, J. W.
Description: Bulletin issued by the U.S. Bureau of Mines: "This publication is devoted exclusively to a review and abstracts of decisions based on the laws governing the rights and duties of mine owners, operators, miners, and persons trafficking in all kinds of mining properties. It includes abstracts of current decisions of all the Federal and State courts of last resort on questions relating to the mining industries" (Bulletin 61, p. 9).
Contributing Partner: UNT Libraries Government Documents Department
The aerodynamic properties of thick aerofoils suitable for internal bracing

The aerodynamic properties of thick aerofoils suitable for internal bracing

Date: 1920
Creator: Norton, F H
Description: The object of this investigation was to determine the characteristics of various types of wings having sufficient depth to entirely inclose the wing bracing, and also to provide data for the further design of such sections. This type of wing is of interest because it eliminates the resistance of the interplane bracing, a portion of the airplane that sometimes absorbs one-quarter of the total power required to fly, and because these wings may be made to give a very high maximum lift. Results of the investigation of the following subjects are given: (1) effect of changing the upper and lower camber of thick aerofoils of uniform section; (2) effect of thickening the center and thinning the tips of a thin aerofoil; (3) effect of adding a convex lower surface to a tapered section; (4) effect of changing the mean thickness with constant center and tip sections; and (5) effect of varying the chord along the span.
Contributing Partner: UNT Libraries Government Documents Department
Airplane performance as influenced by the use of a supercharged engine

Airplane performance as influenced by the use of a supercharged engine

Date: May 1920
Creator: De Bothezat, George
Description: The question of the influence of a supercharged engine on airplane performance is treated here in a first approximation, but one that gives an exact idea of the advantage of supercharging. Considered here is an airplane that climbs first with an ordinary engine, not supercharged, and afterwards climbs with a supercharged engine. The aim is to find the difference of the ceilings reached in the two cases. In the case of our figure, the ceiling from 25,000 feet is increased to 37,000 feet, the supercharging maintaining the power only up to 20,000 feet. This makes, in comparison with an engine without supercharging, an increase of about 50 percent.
Contributing Partner: UNT Libraries Government Documents Department
The altitude laboratory for the test of aircraft engines

The altitude laboratory for the test of aircraft engines

Date: 1920?~
Creator: Dickinson, H C & Boutell, H G
Description: Report presents descriptions, schematics, and photographs of the altitude laboratory for the testing of aircraft engines constructed at the Bureau of Standards for the National Advisory Committee for Aeronautics.
Contributing Partner: UNT Libraries Government Documents Department
Aluminum and its light alloys

Aluminum and its light alloys

Date: 1920?~
Creator: Merica, Paul D
Description: Report is a summary of research work which has been done here and abroad on the constitution and mechanical properties of the various alloy systems with aluminum. The mechanical properties and compositions of commercial light alloys for casting, forging, or rolling, obtainable in this country are described.
Contributing Partner: UNT Libraries Government Documents Department
Annual report of the National Advisory Committee for Aeronautics (4th).administrative report including Technical Reports nos. 24 to 50

Annual report of the National Advisory Committee for Aeronautics (4th).administrative report including Technical Reports nos. 24 to 50

Date: 1920
Creator: unknown
Description: 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, expenditures, problems, recommendations, and a compilation of technical reports produced.
Contributing Partner: UNT Libraries Government Documents Department
Annual report of the National Advisory Committee for Aeronautics (5th).administrative report including Technical Reports nos. 51 to 82

Annual report of the National Advisory Committee for Aeronautics (5th).administrative report including Technical Reports nos. 51 to 82

Date: 1920
Creator: unknown
Description: 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, expenditures, and a compilation of technical reports produced.
Contributing Partner: UNT Libraries Government Documents Department
Approved Explosion-Proof Coal-Cutting Equipment

Approved Explosion-Proof Coal-Cutting Equipment

Date: 1920
Creator: Ilsley, L. C. & Gleim, E. J.
Description: Report discussing description of equipment tested to prevent explosions when using coal-cutting explosions and provides explanation of fire damp protection theory.
Contributing Partner: UNT Libraries Government Documents Department
Bibliography of Petroleum and Allied Substances, 1917

Bibliography of Petroleum and Allied Substances, 1917

Date: 1920
Creator: Burroughs, E. H.
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Bomb trajectories

Bomb trajectories

Date: January 1, 1920
Creator: Wilson, Edwin Bidwell
Description: The report is a mathematical treatise dealing with the trajectories of bombs of high terminal velocity, dropped from a great altitude.
Contributing Partner: UNT Libraries Government Documents Department
Calculation of low-pressure indicator diagrams

Calculation of low-pressure indicator diagrams

Date: January 1, 1920
Creator: Kemble, E C
Description: Report develops a fundamental conception and partial application of a method for calculating the pressure-volume relationships to be expected for any given engine design. It outlines a method of computing and interpreting low-pressure indicator cards.
Contributing Partner: UNT Libraries Government Documents Department
Carbureting conditions characteristics of aircraft engines

Carbureting conditions characteristics of aircraft engines

Date: January 1, 1920
Creator: Tice, Percival S
Description: Tests were conducted at the altitude laboratory erected at the Bureau of Standards for the National Advisory Committee for Aeronautics to determine the changes in engine performance with changes in atmospheric temperature and pressure at various levels above the earth's surface, with special reference to (a) the variables affecting the functioning of the carburetor and (b) the changes in performance resulting from variables in the carburetor itself. This report constitutes a concise statement of the difficulties to be encountered in this branch of carburetion.
Contributing Partner: UNT Libraries Government Documents Department
Casing Troubles and Fishing Methods in Oil Wells

Casing Troubles and Fishing Methods in Oil Wells

Date: 1920
Creator: Curtin, Thomas
Description: From introduction: "The Bureau of Mines, in its researches aimed to prevent wastes and to increase efficiency in oil-well practice, has investigated the matter of casing troubles and fishing methods. The results of the investigation are set forth in this paper."
Contributing Partner: UNT Libraries Government Documents Department
Characteristics of high-tension magnetos

Characteristics of high-tension magnetos

Date: January 1, 1920
Creator: Silsbee, F. B.
Description: This report gives the results of an investigation made into the fundamental physical characteristics of high-tension ignition magnetos, and also describes the methods used for measuring the quantities involved.
Contributing Partner: UNT Libraries Government Documents Department
Coal-Mine Fatalities in the United States, 1919: and Coal-Mine Statistics Supplementing Those Published in Bulletin 115

Coal-Mine Fatalities in the United States, 1919: and Coal-Mine Statistics Supplementing Those Published in Bulletin 115

Date: 1920
Creator: Fay, Albert H.
Description: Supplementary report published by the U.S. Bureau of Mines regarding fatalities in coal mines located in the United States: "In addition to giving monthly fatality tables for 1919, this report includes several tables that were published in various monthly statements since 1914, thus making available in one publication all of the data compiled since that time" (p. 9).
Contributing Partner: UNT Libraries Government Documents Department
Comparison of United States and British standard pitot tubes

Comparison of United States and British standard pitot tubes

Date: January 1, 1920
Creator: Zahm, A. F. & Smith, R. H.
Description: The results shown in this report give a comprehensive comparison of the accuracy of United States and British standard pitot tubes.
Contributing Partner: UNT Libraries Government Documents Department
Construction of models for tests in wind tunnels

Construction of models for tests in wind tunnels

Date: January 1, 1920
Creator: Norton, F H
Description: Report deals with the methods of constructing aerofoils and all other parts of a model airplane, including discussion of the degree of accuracy.
Contributing Partner: UNT Libraries Government Documents Department
Design of recording wind tunnel balances

Design of recording wind tunnel balances

Date: December 1, 1920
Creator: Norton, F H
Description: Given here is a description of the design of a scientific recording wind tunnel balance. It was decided that the most satisfactory arrangement would be a rigid ring completely surrounding the tunnel or wind stream, so that the model could be supported from it by wires or any arrangement of spindles. The forces and moments acting on this ring can then be recorded by suitable weighing apparatus. The methods available for recording forces on the arms are explained. The proposed type of balance will support the model rigidly in a variety of ways, will make a complete test without attention, and will plot the results so that all computations are avoided.
Contributing Partner: UNT Libraries Government Documents Department
Development of air speed nozzles

Development of air speed nozzles

Date: January 1, 1920
Creator: Zahm, A F
Description: Report describes the development of a suitable speed nozzle for the first few thousand airplanes made by the United States during the recent war in Europe, and to furnish a basis for more mature instruments in the future. Requirements for the project were to provide a suitable pressure collector for aircraft speed meters and to develop a speed nozzle which would be waterproof, powerful, unaffected by slight pitch and yaw, rugged and easy to manufacture, and uniform in structure and reading, so as not to require individual calibration.
Contributing Partner: UNT Libraries Government Documents Department
Development of the inflow theory of the propeller

Development of the inflow theory of the propeller

Date: November 1, 1920
Creator: Betz, A
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Drag or negative traction of geared-down supporting propellers in the downward vertical glide of a helicopter

Drag or negative traction of geared-down supporting propellers in the downward vertical glide of a helicopter

Date: September 1, 1920
Creator: Toussaint, A
Description: Discussed here are computations of drag or negative traction of geared down supporting propellers in the downward vertical glide of a helicopter. By means of Frounde's Theory, the maximum value of the drag of a windmill is calculated. For wooden propellers, the author finds that the difference between the drag and the weight is proportional to the number of blades and is larger for propellers of small diameter; thus it is 25 kg. for a six blade propeller with a diameter of 2 m. 50. The author notes that if we are to adopt large propellers, we must have recourse to a different method of construction, resulting in large dimension propellers much lighter than those made of wood. In discussing insufficient drag, the author notes that the question of the drag of geared down supporting propellers can only be decided by experiment.
Contributing Partner: UNT Libraries Government Documents Department
Duralumin

Duralumin

Date: July 1, 1920
Creator: Unger, E & Schmidt, E
Description: The use of duralumin in the construction of aircraft makes an account of the properties of this material desirable especially with reference to its working qualities as developed by experience.
Contributing Partner: UNT Libraries Government Documents Department
The dynamometer hub

The dynamometer hub

Date: September 1, 1920
Creator: Stieber, W
Description: The construction of the dynamometer hub is illustrated and explained, and its electrical and aviation motor tests, as well as those in free flight, described.
Contributing Partner: UNT Libraries Government Documents Department
Educational Agencies in Mining Communities

Educational Agencies in Mining Communities

Date: April 1920
Creator: Read, T. T.
Description: Report on the importance of industrial education in the mining sector. It explains general education and facilities for specialized education for proficiency in a given field.
Contributing Partner: UNT Libraries Government Documents Department
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