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 Decade: 1920-1929
 Year: 1924
 Collection: Technical Report Archive and Image Library
Revision of the American Pikas (Genus Ochotona)

Revision of the American Pikas (Genus Ochotona)

Date: August 21, 1924
Creator: Howell, Arthur H.
Description: Discusses distribution, habitat, habits, pelage, molt, specimens, history, and nomenclature of pikas. Provides descriptions, locations, and a key for species and subspecies.
Contributing Partner: UNT Libraries Government Documents Department
Permissible Explosives, Mining Equipment, and Apparatus Approved Prior to January 1, 1924

Permissible Explosives, Mining Equipment, and Apparatus Approved Prior to January 1, 1924

Date: 1924
Creator: Crawshaw, John Edward, 1880-; Ilsley, L. C., 1880-; Parker, Dorsey J. & Fieldner, Arno Carl, 1881-1966
Description: Report documenting mining explosives, equipment, and breathing apparatuses approved by the United States Bureau of Mines prior to January 1, 1924.
Contributing Partner: UNT Libraries Government Documents Department
Diaphragms for Aeronautic Instruments

Diaphragms for Aeronautic Instruments

Date: January 1, 1924
Creator: Hersey, M D
Description: This investigation was carried out at the request of the National Advisory Committee for Aeronautics and comprises an outline of historical developments and theoretical principles, together with a discussion of expedients for making the most effective use of existing diaphragms actuated by the hydrostatic pressure form an essential element of a great variety instruments for aeronautic and other technical purposes. The various physical data needed as a foundation for rational methods of diaphragm design have not, however, been available hitherto except in the most fragmentary form.
Contributing Partner: UNT Libraries Government Documents Department
The vector ruling protractor

The vector ruling protractor

Date: March 1, 1924
Creator: Zahm, A F
Description: The theory, structure and working of a vector slide rule is presented in this report. This instrument is used for determining a vector in magnitude and position when given its components and its moment about a point in their plane.
Contributing Partner: UNT Libraries Government Documents Department
Ultra-light alloys and their utilization on aircraft

Ultra-light alloys and their utilization on aircraft

Date: May 1, 1924
Creator: Defleury, R & Portevin, A M
Description: We will arbitrarily call alloys having a specific gravity of less than 2 "ultra-light", in order to distinguish them from "light" alloys with a specific gravity of 2 to 3. Thus far it has been possible to make ultra-light alloys only by employing a large proportion of magnesium.
Contributing Partner: UNT Libraries Government Documents Department
Device for measuring sound in airplane engines

Device for measuring sound in airplane engines

Date: June 1, 1924
Creator: Robrovsky, T
Description: I will here call attention to a device, constructed according to the system of Gati with which it is possible to measure the sound of an engine and test the effect of a silencer.
Contributing Partner: UNT Libraries Government Documents Department
Voyage of the "Dixmude" over northern Africa

Voyage of the "Dixmude" over northern Africa

Date: March 1, 1924
Creator: Lemaire,
Description: This article presents the difficulties and triumphs of the airship Dixmude in its long distance flight over North Africa.
Contributing Partner: UNT Libraries Government Documents Department
Effect of altitude on power of aviation engines

Effect of altitude on power of aviation engines

Date: November 1, 1924
Creator: Raffaelli, Italo
Description: These notes are intended to furnish practical and general data on the effect of altitude on engine power. The effective horsepower of an engine is a function of the mean pressure of the fluid acting on the pistons, of the R.P.M. of the engine and of the mechanical efficiency.
Contributing Partner: UNT Libraries Government Documents Department
Fatigue of internal combustion engines

Fatigue of internal combustion engines

Date: April 1, 1924
Creator: Dumanois, P
Description: The above conditions enable the employment of a criterion of general fatigue which simultaneously takes account of both mechanical and thermal conditions, for the sake of comparing any projected engine with engines of the same type already in use.
Contributing Partner: UNT Libraries Government Documents Department
Experiments on the resistance of airplane wheels and radiators

Experiments on the resistance of airplane wheels and radiators

Date: July 1, 1924
Creator: unknown
Description: Experiments were made on the resistance of four airplane wheels of different sizes and coverings and two Lamblin radiators. The results show the important influence of the wheel coverings. The closing of a shutter, which was fitted to one of the radiators, considerably lessened the resistance.
Contributing Partner: UNT Libraries Government Documents Department
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