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Talc Mining in New York

Description: Report issued by the U.S. Bureau of Mines on the talc deposits in New York state. The report includes details on the geology of the deposits, and the mining and milling of the talc. This report contains illustrations.
Date: October 1920
Creator: Ladoo, Raymond B.
Partner: UNT Libraries Government Documents Department
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Inherent Stability of Helicopters

Description: The equilibrium, in still air, of a "stationary" helicopter (i.e., of one having neither vertical nor translational velocity, but a tendency to remain practically motionless within restricted limits of space) presents some difficulty in practice and justifies a theoretical investigation of its "inherent stability," i.e., independent of the pilot.
Date: October 1923
Creator: Crocco, G. Arturo
Partner: UNT Libraries Government Documents Department
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Shortening the Landing Run

Description: Methods for shortening the landing run are discussed as well as the need for more emergency landing fields that will, by necessity, have to be short fields.
Date: October 1923
Creator: Warner, Edward P.
Partner: UNT Libraries Government Documents Department
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Deflection of Propeller Blades While Running

Description: "The forces acting on the blades of a propeller proceed from the mass of the propeller and the resistance of the surrounding medium. The magnitude, direction and point of application of the resultant to the propeller blade is of prime importance for the strength calculation. Since it was obviously impracticable to bring any kind of testing device near the revolving propeller, not so much on account of the element of danger as on account of the resulting considerable disturbance of the air flow, the deflection in both cases was photographically recorded and subsequently measured at leisure" (p. 1).
Date: October 1922
Creator: Katzmayr, R.
Partner: UNT Libraries Government Documents Department
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The Wing With a Pointed Tip

Description: In airplane construction generally one finds an almost exclusive use of wing tips that are practically square end but occasionally those with large rounded tips. For use as a cantilever wing, however, a wing with pointed tips may contain valuable aerodynamic advantages.
Date: October 1922
Creator: v. Prondzynski, Stephan
Partner: UNT Libraries Government Documents Department
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Effect of Periodic Changes of Angle of Attack on Behavior of Airfoils

Description: This report presents the results of a series of experiments, which gave some quantitative results on the effect of periodic changes in the direction of the relative air flow against airfoils. The first series of experiments concerned how the angle of attack of the wing model was changed by causing the latter to oscillate about an axis parallel to the span and at right angles to the air flow. The second series embraced all the experiments in which the direction of the air flow itself was periodically changed.
Date: October 1922
Creator: Katzmayr, R.
Partner: UNT Libraries Government Documents Department
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Training of Aeronautical Engineers

Description: The requirements and preliminary coursework for aeronautical engineering are discussed. Some of the specific mechanical engineering properties that must be understood are provided. The report is incomplete.
Date: October 1922
Creator: Warner, Edward P.
Partner: UNT Libraries Government Documents Department
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Air Transport Economics

Description: Report presenting an exploration of the costs of operation for commercial airlines operating in Europe at the time of the report.
Date: October 1922
Creator: Warner, Edward P.
Partner: UNT Libraries Government Documents Department
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Computative examination of bending strength of girders originally curved and subjected to longitudinal compression

Description: This report examines the stipulation contained in the 1918 BLV, that a girder subjected to longitudinal compression under the influence of half of the specified breaking load, along with Euler bending safety with an initial deflection of 1/200 of the length of the girder can, at most, be subjected to half the stipulated breaking strength.
Date: October 1922
Creator: Hoff, Wilhelm
Partner: UNT Libraries Government Documents Department
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Effect of Protruding Gasoline Tanks Upon the Characteristics of an Airfoil

Description: Note presenting an investigation to determine the effect of a gasoline tank protruding from the center section of a wing on the aerodynamic characteristics of the wing. The results are presented in the form of polar curves, curves of D/L against lift coefficient, and the curves of lift and drag coefficient against the angle of attack.
Date: October 1926
Creator: Jacobs, Eastman N.
Partner: UNT Libraries Government Documents Department
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Mooring Airships

Description: The purpose of this paper is to summarize the present status of the problem of mooring airships. Mooring with one, two and even three cables are all discussed.
Date: October 1924
Creator: Crocco, G. A.
Partner: UNT Libraries Government Documents Department
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Duralumin, Its Properties and Uses

Description: A historical sketch of duralumin is presented, especially in regards to its manufacture by various countries. The properties of duralumin are discussed and strength characteristics listed. Increasing the hardness of duralumin by tempering is discussed as well as the uses of the metal.
Date: October 1924
Creator: Beck, R.
Partner: UNT Libraries Government Documents Department
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Calculation of the hull and of the car-suspension systems of airships

Description: Differential and integral curves are presented and well as numerous calculations relating to hulls. Some of the calculations include those relating to hulls, those relating to the invariability of the shape of the hulls, and those relating to the suspension of the hull.
Date: October 1924
Creator: Verduzio, R.
Partner: UNT Libraries Government Documents Department
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Results of Experiments With Slotted Wings

Description: This report recounts some of the successful experiments conducted in England and Germany on slotted wings and ailerons. Wind tunnel test results are given and examples of aircraft constructed with these new wing components are described.
Date: October 1924
Creator: Lachmann, G.
Partner: UNT Libraries Government Documents Department
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Efficiencies in the Use of Bituminous Coking Coal as Water-Gas Generator Fuel

Description: Technical paper issued by the Bureau of Mines over the use of coking coal as a generator fuel. The results of using coking coal as fuel are presented and discussed. This paper includes tables, and illustrations.
Date: October 1923
Creator: Odell, W. W.
Partner: UNT Libraries Government Documents Department
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Recovery of Gold from Black Sand Tailings

Description: Report on the recovery of gold from black sand tailings, based on tests conducted at the U.S. Bureau of Mines' Alaska Station.
Date: October 1920
Creator: Gross, John
Partner: UNT Libraries Government Documents Department
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Combustion of Liquid Fuels in Diesel Engine

Description: Hitherto, definite specifications have always been made for fuel oils and they have been classified as more or less good or non-utilizable. The present aim, however, is to build Diesel engines capable of using even the poorest liquid fuels and especially the waste products of the oil industry, without special chemical or physical preparation.
Date: October 1924
Creator: Alt, Otto
Partner: UNT Libraries Government Documents Department
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The Caproni Monoplanes "Ca 97" (Italian)

Description: The Ca 97 is constructed with wings half overhung, a large fuselage, all metal construction, and can be configured with 1 to 3 engines.
Date: October 1928
Partner: UNT Libraries Government Documents Department
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The Fairchild "All-Purpose" Cabin Monoplane

Description: The Fairchild "all-purpose" is a 4 seater with a large luggage compartment, good visibility, and can be configured for surveying work. It is rated at 200 HP. at 1800 R.P.M., but can deliver over 220 HP.
Date: October 1927
Partner: UNT Libraries Government Documents Department
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The De Havilland "Tiger Moth": A Low Wing Monoplane

Description: With a speed of 186.5 M.P.H. and an operational altitude of 20,000 feet the De Havilland Tiger Moth has caused comment as it was introduced just before the King's Cup race of 1927. It is a single seater with unusual control configuration due to the cramped cockpit area.
Date: October 1927
Partner: UNT Libraries Government Documents Department
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Concrete Airship Sheds at Orly, France Part 1: General Aspect of the Problem, Basic Principles of the Final Project, Principal Structural Elements

Description: This report details the contest to design and build concrete airship hangers. The difficulty lies in the magnitude of the absolute dimensions. An airship shed must withstand two principal types of stresses: those resulting from its own weight and those due to the wind. This report discusses both problems in detail.
Date: October 1925
Creator: Freyssinet
Partner: UNT Libraries Government Documents Department
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Information Obtained From Airplane Flight Tests in the Year 1927-1928

Description: The information obtained from flight tests in 1927-1928 covers chiefly the effect of the structural features of an airplane on its stability, controllability, maneuverability and spinning characteristics.
Date: October 1929
Creator: Hübner, W.
Partner: UNT Libraries Government Documents Department
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