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  Partner: UNT Libraries Government Documents Department
 Decade: 1920-1929
 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: January 1, 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
Air flow through poppet valves

Air flow through poppet valves

Date: January 1, 1920
Creator: Lewis, G W & Nutting, E M
Description: Report discusses the comparative continuous flow characteristics of single and double poppet valves. The experimental data presented affords a direct comparison of valves, single and in pairs of different sizes, tested in a cylinder designed in accordance with current practice in aviation engines.
Contributing Partner: UNT Libraries Government Documents Department
The airplane tensiometer

The airplane tensiometer

Date: January 1, 1920
Creator: Larson, L J
Description: Certain parts of an airplane are subjected not only to the stresses imposed by the aerodynamic or flying load, but also to the initial stresses, caused by the tension in the stay and drift wires. Report describes a tensiometer that measures such stresses which is simple in construction, accurate, and easily and quickly operated even by inexperienced persons. Two sizes of the instrument are available. One is suitable for wires up to one-fourth inch in diameter and the other for wires from one-fourth to three-eights inch in diameter.
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: January 1, 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: January 1, 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: January 1, 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: January 1, 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: None
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: None
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
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
Effect of altitude on radiator performance

Effect of altitude on radiator performance

Date: January 1, 1920
Creator: James, W S & Parsons, S R
Description: As an airplane rises to high altitudes the decrease in the density and the temperature of the air have important effects on the performance of the radiator. This report gives the results of a study of the effect of reduced pressure and temperature upon the capacity of airplane radiators. A method is presented by which the performance of a radiator at an altitude may be estimated for a particular speed of the airplane at a particular altitude.
Contributing Partner: UNT Libraries Government Documents Department
The effect of kiln drying on the strength of airplane woods

The effect of kiln drying on the strength of airplane woods

Date: January 1, 1920
Creator: Wilson, T R C
Description: This report is a very complete treatise on the comparative strength of air and kiln dried wood. The series of tests includes 26 species of wood, approximately 100 kiln runs, and over 10,000 mechanical tests.
Contributing Partner: UNT Libraries Government Documents Department
Effect of temperature and pressure on the sparking voltage

Effect of temperature and pressure on the sparking voltage

Date: January 1, 1920
Creator: Loeb, L B & Silsbee, F B
Description: This report presents the results of an investigation which was to determine how the voltage necessary to produce the proper spark discharge varies with the pressure and temperature of the gas in which the discharge takes place.
Contributing Partner: UNT Libraries Government Documents Department
Experimental research on air propellers II

Experimental research on air propellers II

Date: January 1, 1920
Creator: Durand, William F & Lesley, E P
Description: This report is a continuation of NACA Technical Report 14. It presents the results of an experimental investigation on the performance of air propellers which was divided into five parts, as follows: (1) Tests under conditions of flight on 16 model propellers of different forms, sections, or pitch ratios from those of Technical Report 14; (2) Tests under conditions of flight on one model propeller of variable pitch; (3) Tests under conditions of flight on three sets of right and left hand model propellers in series; (4) Tests on 12 model propellers to determine brake effect or negative thrust at negative slip; (5) Standing thrust and power tests of 67 model propellers.
Contributing Partner: UNT Libraries Government Documents Department
Experimental research on air propellers III

Experimental research on air propellers III

Date: January 1, 1920
Creator: Durand, W F & Lesley, E P
Description: Report presents the results of wind tunnel tests of propellers that examined the influence of the following characteristics: (1) nominal pitch ratio 1.3 combined with a certain number of the more common or standard forms and proportions; (2) driving face slightly rounded or convex; (3) change in the location of the maximum thickness ordinate of the blade section; (4) pushing forward the leading edge of the blade, thus giving a rounded convex surface on the leading side of the driving face. (5) a series of values for the constant "angle of attack" in forming propellers with radially increasing pitch. In accordance with these purposes tests were carried out on 28 propellers.
Contributing Partner: UNT Libraries Government Documents Department
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