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 Decade: 1920-1929
 Year: 1921
 Collection: Technical Report Archive and Image Library
A Biological Survey of Alabama

A Biological Survey of Alabama

Date: October 28, 1921
Creator: Howell, Arthur H.
Description: Booklet describing the biology of Alabama in two sections: (1) physiography and life zones, and (2) mammals. It also includes an annotated species list of mammals, bibliography, and index starting on page 81.
Contributing Partner: UNT Libraries Government Documents Department
The Recovery of Unburned Fuel from Boiler Furnace Refuse

The Recovery of Unburned Fuel from Boiler Furnace Refuse

Date: September 1921
Creator: Fraser, Thomas & Yancey, H. F.
Description: Report on recovering unburned fuel from boiler furnace refuse, based on processes used in Europe and tests in the United States.
Contributing Partner: UNT Libraries Government Documents Department
Discussion of the National Electrical Safety Code: (to Accompany the Third Edition of the Code), October 31, 1920

Discussion of the National Electrical Safety Code: (to Accompany the Third Edition of the Code), October 31, 1920

Date: 1921
Creator: unknown
Description: Discussion of the updated rules in the third edition of the National Electrical Safety Code.
Contributing Partner: UNT Libraries Government Documents Department
Lift theory of supporting surfaces : second article

Lift theory of supporting surfaces : second article

Date: September 1, 1921
Creator: Von Mises, R
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Tin soldering of aluminum and its alloys

Tin soldering of aluminum and its alloys

Date: October 1, 1921
Creator: Gallo, Gino
Description: A method is presented for soldering aluminum to other metals. The method adopted consists of a galvanic application to the surface of the light-metal parts to be soldered, of a layer of another metal, which, without reacting electrolytically on the aluminum, adheres strongly to the surface to which it is applied, and is, on the other hand, adapted to receive the soft solder. The metal found to meet the criteria best was iron.
Contributing Partner: UNT Libraries Government Documents Department
Distant-compass

Distant-compass

Date: June 1, 1921
Creator: Friedensburg, Walter & Miner, D M
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Some new tests at the Gottingen laboratory

Some new tests at the Gottingen laboratory

Date: April 1, 1921
Creator: unknown
Description: The tests at the Gottingen laboratory included: friction tests on a surface treated with omelette, verification tests on the M.V.A. 356 wing, and comparative tests of wing no. 36 at the Eiffel laboratory. The examination of all these experiments leads to the belief that, at large incidences, the speeds registered by the suction manometer of the testing chamber of the Eiffel laboratory wind tunnel are, owing to pressure drop, greater than the actual speeds. Therefore, the values of k(sub x) and k(sub y) measured at the Eiffel laboratory at large incidences are too low.
Contributing Partner: UNT Libraries Government Documents Department
On the definition of the standard atmosphere

On the definition of the standard atmosphere

Date: April 1, 1921
Creator: Grimault, P
Description: On April 15, 1920, the under Secretary of State for Aeronautics and Aerial Transport decided to adopt as Standard Atmosphere for official airplane tests in France, the atmosphere defined by the following law, known as the Law of the S.T.You.(Technical Section of Aeronautics): From 0 to 11,000 m. - 0=15-0.0065 Z and above 11,000 m. - 0= -56.5 degrees being the temperature in centigrade degrees at altitude Z expressed in meters. For altitude 0 the pressure is 760 mm of mercury. In the magazine "L'Aeronautique" Mr. A. Toussaint has already written at length on the first studies which led to the elaboration of this law. Since that time the results obtained have been confirmed by fuller and more abundant data which have justified the official adoption of the Law of the S.T. You. The object of the present article is to give a summary exposition and discussion of the ideas and documents which form the basis of the question.
Contributing Partner: UNT Libraries Government Documents Department
The drawing of experimental curves

The drawing of experimental curves

Date: July 1, 1921
Creator: Norton, F H
Description: This report presents a discussion of how to determine the location of a line or surface from experimental data. What we desire to know practically is the number of ordinates required to obtain a certain probable precision in drawing a line or surface.
Contributing Partner: UNT Libraries Government Documents Department
Analytical methods for computing the polar curves of airplanes

Analytical methods for computing the polar curves of airplanes

Date: March 1, 1921
Creator: LE SUEUR
Description: This report presents a method of calculating polar curves which is at least as precise as graphical methods, but it more rapid. Knowing the wind tunnel test of a wing and the performances of an airplane of the same profile, it is easy to verify the characteristic coefficients and, at the same time, the methods determining induced resistances.
Contributing Partner: UNT Libraries Government Documents Department
Annual Report of the Director [of] the Bureau of Standards to the Secretary of Commerce for the Fiscal Year Ended June 30, 1921

Annual Report of the Director [of] the Bureau of Standards to the Secretary of Commerce for the Fiscal Year Ended June 30, 1921

Date: 1921
Creator: United States. Bureau of Standards.
Description: Report describing the functions and operations of the United States Bureau of Commerce and its divisions during the fiscal year.
Contributing Partner: UNT Libraries Government Documents Department
Gas Masks for Gases Met in Fighting Fires

Gas Masks for Gases Met in Fighting Fires

Date: August 1921
Creator: Fieldner, Arno Carl; Katz, Sidney H. & Kinney, Selwyne P.
Description: Technical paper issued by the Bureau of Mines over the development of gas masks designed for fighting fires. The characteristics of the different types of masks in development are presented. This paper includes tables, illustrations, and photographs.
Contributing Partner: UNT Libraries Government Documents Department
Fire Tests of Building Columns

Fire Tests of Building Columns

Date: April 21, 1921
Creator: Ingberg, S. H.; Griffin, H. K.; Robinson, W. C. & Wilson, R. E.
Description: Technical paper issued by the Bureau of Mines over studies conducted on fire resistance on building columns. As stated in the introduction, "the purpose of this investigation is to ascertain (1) the ultimate resistance against fire, of protected and unprotected columns as used in the interior of buildings; (2) their resistance against impact and sudden cooling from hose streams when in a highly heated condition" (p. 12). This paper includes tables, illustrations.
Contributing Partner: UNT Libraries Government Documents Department
Quarry Accidents in the United States During the Calendar Year 1919

Quarry Accidents in the United States During the Calendar Year 1919

Date: 1921
Creator: Adams, William W.
Description: Technical paper issued by the Bureau of Mines over quarry accidents reported during the year of 1919. The results of the accident reports collected are presented and discussed. This paper includes tables.
Contributing Partner: UNT Libraries Government Documents Department
Petroleum Laws of All America

Petroleum Laws of All America

Date: March 1921
Creator: Thompson, Joseph Wesley
Description: Report issued by the Bureau of Mines covering petroleum laws of the U.S. and surrounding oil producing countries. As stated in the preface, "this bulletin includes the petroleum laws of (1) United States; (2) the several oil-producing States; (3) Canada; (4) Mexico; (5) the Republics of Central and South America" (p. iv).
Contributing Partner: UNT Libraries Government Documents Department
Destructive Distillation of Mixtures of Oil and Coal

Destructive Distillation of Mixtures of Oil and Coal

Date: December 1921
Creator: Davis, Joseph D.; Place, Palmer B. & Scott, G. S.
Description: Report issued by the U.S. Bureau of Mines on the characteristics and behavior of oil and coal distillation processes. The effectiveness of the distillation processes and the properties of the oil and coal mixtures are presented. This report includes tables, graphs, and illustrations.
Contributing Partner: UNT Libraries Government Documents Department
Treatment of the Tungsten Ores of Boulder County, Colo.

Treatment of the Tungsten Ores of Boulder County, Colo.

Date: October 1921
Creator: Bonardi, J. P. & Williams, J. C.
Description: Report discussing the the development of milling practice in Boulder County, the ore-dressing methods in use, and the local manufacture of ferrotungsten and tungstic oxide. Figures giving the production of tungsten concentrates in the Boulder district, in the United States, and in the world; data on the buying of tungsten ores; costs of production; and the normal tungsten requirements in this country are presented.
Contributing Partner: UNT Libraries Government Documents Department
Diagrams of airplane stability

Diagrams of airplane stability

Date: January 1, 1921
Creator: Batemen, H
Description: In this report a study is made of the effect on longitudinal and lateral oscillations of an airplane of simultaneous variations in two resistance derivatives while the remainder of the derivatives are constant. The results are represented by diagrams in which the two variable resistance derivatives are used as coordinates, and curves are plotted along which the modulus of decay of a long oscillation has a constant value. The same type of analysis is also carried out for the stability of the parachute. In discussing the stability of the helicopter it is concluded that the gyroscopic effect on stability will be greater than in the case of the airplane.
Contributing Partner: UNT Libraries Government Documents Department
Analysis of wing truss stresses including the effect of redundancies

Analysis of wing truss stresses including the effect of redundancies

Date: January 1, 1921
Creator: Warner, E P & Miller, R G
Description: Airplane wing trusses are generally designed to contain redundant members (stagger wires and external drag wires) which, according to common practice, are not taken into account in calculations, so as to simplify the stress analysis by rendering the structure statically determinate. A more accurate method, in which the redundancies are included, involves a solution by means of Castigliano's method of least work. For the purpose of demonstrating the practical application of the method of least work this report presents examples for stresses of several cases of loading worked out for a structure similar to that of the Curtiss JN-4h. Case 1 was taken as the condition of velocity of 100 miles per hour combined with the angle of attack of maximum lift. Case 1a assumed the same loading but neglected the distortion of wooden members in the least-work analysis. So little error was involved in case 1a that this simplified method was employed for each succeeding case. Case 2 assumed a diving speed of 120 miles per hour and an angle of attack of no lift. Case 3 was worked out for the conditions imposed by the sand load recommended in NACA technical note no. 6.
Contributing Partner: UNT Libraries Government Documents Department
The efficiency of small bearings in instruments of the type used in aircraft

The efficiency of small bearings in instruments of the type used in aircraft

Date: January 1, 1921
Creator: Norton, F H
Description: This report deals with the construction and properties of bearings and pivots for use in instruments. The static and running friction for both thrust and radial loads was determined for a number of conical pivots and cylindrical and ball bearings. The static rocking friction was also measured for several conical and ball bearings under a heavy load, especially to determine their suitability for use in N. P. L. (National Physical Laboratory) type wind tunnel balance. In constructing conical pivots and sockets it was found that the pivots should be hardened and highly polished, preferably with a revolving lap, and that the sockets should be made by punching with a hardened and polished punch. It was found that for a light load the conical pivots give less friction than any other type, and their wearing qualities when hardened are excellent. Very small ball bearings are unsatisfactory because the proportional accuracy of the balls and races is not high enough to insure smooth running. For rocking pivots under heavy loads it was found that a ball-and-socket bearing, consisting of a hemispherical socket and a sphere of smaller diameter concentric with it, with a row of small balls resting between the two, was ...
Contributing Partner: UNT Libraries Government Documents Department
Moisture resistant finishes for airplane woods

Moisture resistant finishes for airplane woods

Date: January 1, 1921
Creator: Dunlap, M E
Description: This report describes briefly a series of experiments made at the Forest Products Laboratory, Madison, Wisconsin, to determine the comparative moisture resistance of linseed oil, impregnation treatments, condensation varnishes, oil varnishes, enamels, cellulose varnishes, rubber, electroplated and sprayed metal coatings, and metal-leaf coatings when applied to wood. All coatings except rubber and electroplated metal coatings, which were not developed sufficiently to make them practical, admitted moisture in varying degrees. The most effective and most practical coating was found to be that of aluminum leaf.
Contributing Partner: UNT Libraries Government Documents Department
Data on the design of plywood for aircraft

Data on the design of plywood for aircraft

Date: January 1, 1921
Creator: Elmendorf, Armin
Description: This report makes available data which will aid the designer in determining the plywood that is best adapted to various aircraft parts. It gives the results of investigations made by the Forest Products Laboratory of the United States Forest Service at Madison, Wisconsin, for the Army and Navy Departments, and is one of a series of reports on the use of wood in aircraft prepared by the Forest Products Laboratory for publication by the National Advisory Committee for Aeronautics. The object of the study was to determine, through comprehensive tests, the mechanical and physical properties of plywood and how these properties vary with density, number, thickness, arrangement of the plies and direction of grain of the plies.
Contributing Partner: UNT Libraries Government Documents Department
Wind tunnel studies in aerodynamic phenomena at high speed

Wind tunnel studies in aerodynamic phenomena at high speed

Date: January 1, 1921
Creator: Caldwell, F W & Fales, E N
Description: A great amount of research and experimental work has been done and fair success obtained in an effort to place airplane and propeller design upon an empirical basis. However, one can not fail to be impressed by the apparent lack of data available toward establishing flow phenomena upon a rational basis, such that they may be interpreted in terms of the laws of physics. With this end in view it was the object of the authors to design a wind tunnel differing from the usual type especially in regard to large power and speed of flow. This report describes the wind tunnel at Mccook Field and gives the results of experiments conducted in testing the efficiency of the wind tunnel.
Contributing Partner: UNT Libraries Government Documents Department
Experimental research on air propellers  IV

Experimental research on air propellers IV

Date: January 1, 1921
Creator: Durand, W F & Lesley, E P
Description: This report states the results of investigations made upon numerous propeller models at the request of the Subcommittee on Aerodynamics, and contains valuable data for those interested in the design of air propellers.
Contributing Partner: UNT Libraries Government Documents Department
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