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  • Other Sources  (130)
  • NASA Technical Reports  (128)
  • Bibliography on Seismology  (2)
  • 1920-1924  (130)
  • 1921  (130)
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  • Other Sources  (130)
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  • 1920-1924  (130)
Year
  • 1
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    The phenomena of rupture and flow in solids (1921)
    In:  Phil. Trans. Roy. Soc., London, Dt. Geophys. Ges. e. V., vol. A221, no. B11, pp. 163-198, pp. L06304, (ISBN: 0534351875, 2nd edition)
    Details
    Publication Date: 1921
    Keywords: Rock mechanics ; cracks and fractures (.NE. fracturing) ; Fracture ; Rheology
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    BIBLIOGRAPHY SEISMOLOGY
  • 2
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    Untersuchungen über die Bodenunruhe mit Perioden von 4s-2usds0 - 10s-2usds0 in Europa, 106 S. (1921)
    In:  Veröffentlichungen des Zentralbureaus der Internationalen Seismologischen Assoziation, Straßburg, Universität Göttingen, 40 S., vol. 10, no. GL-TR-89-0230, pp. 49-62, (ISBN 3-933346-037)
    Details
    Publication Date: 1921
    Keywords: Seismology ; NOISE ; ENDNOTE?
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    BIBLIOGRAPHY SEISMOLOGY
  • 3
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    Bibliography of Aeronautics 1909-1916 (1921)
    In:  CASI
    Details
    Publication Date: 2018-06-05
    Description: No abstract available
    Keywords: Aeronautics (General)
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Design of Wind Tunnels and Wind Tunnel Propellers, II (1921)
    In:  CASI
    Details
    Publication Date: 2019-05-10
    Description: No abstract available
    Keywords: ELECTRONICS
    Type: NACA-TR-98
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Aerodynamic characteristics of aerofoils I (1921)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The object of this report is to bring together the investigations of the various aerodynamic laboratories in this country and Europe upon the subject of aerofoils suitable for use as lifting or control surfaces on aircraft. The data have been so arranged as to be of most use to designing engineers and for the purposes of general reference. The absolute system of coefficients has been used, since it is thought by the National Advisory Committee for Aeronautics that this system is the one most suited for international use, and yet is one for which a desired transformation can be easily made. For this purpose a set of transformation constants is included in this report.
    Type: NACA-TR-93
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Comparison of hecter fuel with export aviation gasoline (1921)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Among the fuels which will operate at compression ratios up to at least 8.0 without preignition or "pinking" is hecter fuel, whence a careful determination of its performance is of importance. For the test data presented in this report the hecter fuel used was a mixture of 30 per cent benzol and 70 per cent cyclohexane, having a low freezing point, and distilling from first drop to 90 per cent at nearly a constant temperature, about 20 degrees c. below the average distillation temperature ("mean volatility") of the x gasoline (export grade). The results of these experiments show that the power developed by hecter fuel is the same as that developed by export aviation gasoline at about 1,800 r.p.m. at all altitudes. At lower speeds differences in the power developed by the fuels become evident. Comparisons at ground level were omitted to avoid any possibility of damaging the engine by operating with open throttle on gasoline at so high a compression. The fuel consumption per unit power based on weight, not volume, averaged more than 10 per cent greater with hecter than with x gasoline. The thermal efficiency of the engine when using hecter is less than when using gasoline, particularly at higher speeds. A generalization of the difference for all altitudes and speeds being 8 per cent. A general deduction from these facts is that more hecter is exhausted unburnt. Hecter can withstand high compression pressures and temperature without preignition. (author)
    Type: NACA-TR-90
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    The Efficiency of Small Bearings in Instruments of the Type Used in Aircraft (1921)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    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 superior to a pivot resting in a socket. It was found that vibration such as occurs in an airplane will greatly reduce the static friction of a pivot or bearing, in some cases to as little as one-twentieth of its static value.
    Type: NACA-TR-94
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    Theory of the Ideal Windmill (1921)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Type: NACA-TN-46
    Format: application/pdf
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  • 9
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    Recent European Developments in Helicopters (1921)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Descriptions are given of two captured helicopters, one driven by electric power, the other by a gasoline engine. An account is given of flight tests of the gasoline powered vehicle. After 15 successful flight tests, the gasoline powered vehicle crashed due to the insufficient thrust. Also discussed here are the applications of helicopters for military observations, for meteorological work, and for carrying radio antennas.
    Type: NACA-TN-47
    Format: application/pdf
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  • 10
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    Extract from a Report on the Resistance of Spheres of Small Diameter in an Airstream of High Velocity (1921)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Much attention is given here to the design of the wind tunnel and the experimental set-up. In comparing their results on the wind resistance of spheres to the results of other researchers, the authors find wide discrepancies. They are unable to explain the cause of the discrepancies, concluding, as they do, that the differing results could not be explained by the action of the wind tunnel walls.
    Type: NACA-TN-45
    Format: application/pdf
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