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Variable Pitch Propellers

Description: In this report are described four different types of propellers which appeared at widely separated dates, but which were exhibited together at the last Salon de l'Aeronautique. The four propellers are the Chaviere variable pitch propeller, the variable pitch propeller used on the Clement Bayard dirigible, the variable pitch propeller used on Italian dirigibles, and the Levasseur variable pitch propeller.
Date: November 1920
Creator: Bacon, D. L.
Partner: UNT Libraries Government Documents Department
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Recent Developments in Light Alloys

Description: This report is intended to cover the progress that has been made in both the manufacture and utility of light alloys in the United States since the first part of 1919. Duralumin is extensively discussed both as to manufacture and durability.
Date: November 1920
Creator: Woodward, R. W.
Partner: UNT Libraries Government Documents Department
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Tests of Artificial Flight at High Altitudes

Description: "If we wish to form an accurate idea of the extraordinary progress achieved in aeronautics, a comparison must be made of the latest altitude records and the figures regarded as highest attainable limit some ten years ago. It is desirable, for two reasons, that we should be able to define the limit of the altitudes that can be reached without artificial aid. First, to know to what extent the human body can endure the inhalation of rarified air. Second, the mental capacity of the aviator must be … more
Date: November 1920
Creator: Gradenwitz, Arthur
Partner: UNT Libraries Government Documents Department
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The Photographic Recording of Small Motions

Description: Methods and equipment for recording small and sometimes rapid motions by photographic means are described, and the efficacy of photographic recording in such instances is evaluated. The optical system consisting of the light source, the mirror or prism for transmitting motion to the emergent beam, and a means of bringing the rays into focus on the film are discussed. Attention is given to the critical issue of mirror mounting.
Date: November 1920
Creator: Norton, F. H.
Partner: UNT Libraries Government Documents Department
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Italian and French Experiments on Wind Tunnels

Description: Given here are the results of experiments conducted by Colonel Costanzi of the Italian Army to determine the influence of the surrounding building in which a wind tunnel was installed on the efficiency of the installation, and how the efficiency of the installation was affected by the design of the tunnel. Also given are the results of a series of experiments by Eiffel on 34 models of tunnels of different dimensions. This series of experiments was started in order to find out if, by changing th… more
Date: November 1920
Creator: Knight, William
Partner: UNT Libraries Government Documents Department
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Göttingen Wind Tunnel for Testing Aircraft Models

Description: Given here is a brief description of the Göttingen wind tunnel for the testing of aircraft models, preceded by a history of its development. Included are a number of diagrams illustrating, among other things, a sectional elevation of the wind tunnel, the pressure regulator, the entrance cone and method of supporting a model for simple drag tests, a three-component balance, and a propeller testing device, all of which are discussed in the text.
Date: November 1920
Creator: Prandtl, L.
Partner: UNT Libraries Government Documents Department
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Horizontal Buoyancy in Wind Tunnels

Description: Note presenting an examination of horizontal buoyancy in wind tunnels, including an examination of the relative flow, static pressure gradient, horizontal buoyancy computation, and methods of computation in practical use are provided.
Date: November 1920
Creator: Zahm, A. F.
Partner: UNT Libraries Government Documents Department
open access

Development of the Inflow Theory of the Propeller

Description: Report discusses the theory of inflow of the propeller and the fact that both suctional axial velocity and suctional tangential velocity must be considered when calculating the maximum efficiency.
Date: November 1920
Creator: Betz, A.
Partner: UNT Libraries Government Documents Department
open access

Analyses of Air from Burning Buildings

Description: This report provides results of analyses and pertinent fata regarding eleven samples taken from the composition of the air in burning buildings.
Date: November 1920
Creator: Katz, S. H.
Partner: UNT Libraries Government Documents Department
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