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Law of Similitude for the Surface Resistance of Lacquered Planes Moving in a Straight Line Through Water

Description: The proof of the validity of the Reynolds law of similitude for the surface resistance of planes has been developed with an accuracy hitherto unattained and for a large range of lengths and speeds. It has been shown that, in addition to the form resistance, the resistance of the longitudinal edges must be taken into account.
Date: April 1925
Creator: Gebers, Friedrich
Partner: UNT Libraries Government Documents Department
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Light Aeroplane Engine Development

Description: "It has frequently been stated and written that in order to popularize light aircraft the first essential is the production of a reliable engine capable of being easily maintained and having a long life, at the same time selling at a low figure. It is desired to point out the difficulties in the way of realizing this ideal before remarking on the claims of the various types for adoption" (p. 1).
Date: April 1925
Creator: Fell, L. F. R.
Partner: UNT Libraries Government Documents Department
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The "Magnus Effect" - the Principle of the Flettner Rotor

Description: The phenomenon of the Magnus effect consists in the fact that a revolving body moving relatively to the surrounding fluid (air) is subjected not only to drag (i.e., a force acting in a direction opposite to that of the direction of motion), but also to a lift.
Date: April 1925
Creator: Betz, A.
Partner: UNT Libraries Government Documents Department
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The Light Airplane

Description: This report begins with a review and analysis of the work being done to develop light airplanes in the U.S. and abroad. A technical discussion of the construction and innovations in light airplanes is then presented.
Date: April 1925
Creator: Driggs, Ivan H.
Partner: UNT Libraries Government Documents Department
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Hesselman Heavy-Oil High-Compression Engine

Description: Memorandum presenting a description of the Hesselman heavy-oil high-compression engine, which is meant to solve many of the problems associated with standard diesel engines. Specific details of the fuel pump, fuel valve, spraying, and process by which the engine functions are provided.
Date: April 1925
Creator: Hesselman, K. J. E.
Partner: UNT Libraries Government Documents Department
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Structural Methods Employed by the Schutte-Lanz Airship Company

Description: "This article is based on the experience of the Schute-Lanz Airship Company in light construction. The object is to stimulate the employment of these methods in other fields of industry" (p. 1).
Date: May 1925
Creator: Gentzcke
Partner: UNT Libraries Government Documents Department
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Hulls for Large Seaplanes

Description: "In reality, the principle of similitude is not applicable to the hulls, the designing of which increases in difficulty with increasing size of the seaplanes. In order to formulate, at least in a general way, the basic principles of calculation, we must first summarize the essential characteristics of a hull with reference to its gradual enlargement. In this study, we will disregard hulls with wing stubs, as being inapplicable to large seaplanes" (p. 2).
Date: January 1925
Creator: Magaldi, Giulio
Partner: UNT Libraries Government Documents Department
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Experimental Determination of Pressure Drop Caused by Wire Gauze in an Air Stream

Description: "For several kinds of wire gauze the difference in static, dynamic and total or absolute pressure in front of and behind the gauze were determined for comparison with the pressure drop caused by an airplane radiator, such gauze being used on airplane models to represent the radiator" (p. 1).
Date: January 1925
Partner: UNT Libraries Government Documents Department
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Royal Aero Club Light Aeroplane Competition

Description: Memorandum describing the results of the Royal Aero Club light airplane competition and some of the history surrounding the event. A list of the planes that participated and an analysis of the performance of the various aircraft are provided.
Date: January 1925
Creator: Buchanan, J. S.
Partner: UNT Libraries Government Documents Department
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Results of Recent Experiments With Slotted Wings

Description: This report gives the results of a recent series of experiments performed on a wing designed for a cantilever monoplane. Both wings were trapezial in their ground plan, with their tips rounded elliptically. These wing sections combine all known devices for increasing the lift, namely, the slot, the increased camber and angle of attack by means of an aileron running the whole length of the span.
Date: January 1925
Creator: Lachmann, G.
Partner: UNT Libraries Government Documents Department
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Determination of Ignition Points of Liquid Fuels Under Pressure

Description: Two series of experiments were tried, in order to determine the ignition point at any desired pressure, the first series at constant and the second at varying pressure. The results differ greatly and indicate that testing under pressure, in the investigation of liquid fuels, can be done best in the laboratory and that the determination of the ignition points in an open vessel furnishes no certain indication of the behavior of the fuel in the engine.
Date: January 1925
Creator: Tausz, J. & Schulte, F.
Partner: UNT Libraries Government Documents Department
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The Metallurgy of Quicksilver

Description: From General Conclusions: "The main conclusions to be drawn from the work discussed in this bulletin may be summarized as follows: In the direct-furnace treatment of quicksilver ores the major problem in the extraction of quicksilver has been solved. Methods are available whereby low-grade ore can be treated with a remarkably high recovery and at low cost in view of small scale of operations at most plants."
Date: 1925
Creator: Duschak, L. H. & Schuette, C. N.
Partner: UNT Libraries Government Documents Department
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Surface Machinery and Methods for Oil-Well Pumping

Description: From Introduction General Scope: "This bulletin deals with prime movers, power-transmitting machinery, and the surface equipment and methods used to pump oil wells."
Date: 1925
Creator: George, H. C.
Partner: UNT Libraries Government Documents Department
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Mine Timber: Its Selection, Storage, Treatment, and Use

Description: From Introduction Purpose and Scope of Bulletin: "The purpose of this bulletin is to point out some of the benefits and economies to be derived by selecting, preparing, storing, pre-serving, and utilizing mine timber more carefully and to give some specific information on certain preservatives and processes suitable for mine timber."
Date: 1925
Creator: Hornor, R. R. & Tufft, Harry E.
Partner: UNT Libraries Government Documents Department
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Tests of a Large Boiler Fired with Powdered Coal at the Lakeside Station, Milwaukee

Description: From Introduction: "This report gives the results of 26 tests of a four-pass Edgemoor boiler fired with powdered coal at the Lakeside station of the Milwaukee Electric Railway & Light Co.
Date: 1925
Creator: Kreisinger, Henry; Blizard, John; Augustine, C. E. & Cross, B. J.
Partner: UNT Libraries Government Documents Department
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Sources of Limestone, Gypsum, and Anhydrite for Dusting Coal Mines to Prevent Explosions

Description: From Preface: "The writer began testing the rock-dusting method for the Bureau of Mines at the Pittsburgh gallery in 1909, and later continued such testing in the bureau's experimental mine, with favorable results. Beginning in 1911 the bureau issued reports recommending rock dusting as alternative to watering."
Date: 1925
Creator: Bowles, Oliver
Partner: UNT Libraries Government Documents Department
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Metal-Mine Accidents in the United States During the Calendar Year 1923

Description: Report issued by the U.S. Bureau of Mines covering accidents that happened in metal mines located in the United States including statistics for injuries, fatalities, kinds and causes of accidents, and operational data, such as number of mine workers and shifts worked.
Date: 1925
Creator: Adams, William W.
Partner: UNT Libraries Government Documents Department
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Protection of Oil and Gas Field Equipment Against Corrosion

Description: From Introduction: "This bulletin describes common causes and effects of oil and gas field corrosion and outlines methods of abating the damage."
Date: 1925
Creator: Mills, R. Van A.
Partner: UNT Libraries Government Documents Department
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Screen Sizing of Coal, Ores and Other Minerals

Description: From Introduction: "The data in this bulletin were obtained during an investigation of screening practice by the University of Illinois engineering experiment station and the United States Bureau of Mines under a cooperative agreement between them and the State of Illinois Geographical Survey Division. The present investigation was limited to a study of screening as applied in preparing mineral products with the expectation of obtaining more comprehensive information on screening machinery."
Date: 1925
Creator: Holbrook, E. A. & Fraser, Thomas
Partner: UNT Libraries Government Documents Department
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Coal-Mine Fatalities in the United States, 1924

Description: Report compiled by the U.S. Bureau of Mines including statistics on fatalities in coal mines located in the United States as well as data regarding the various operations (e.g., number of miners employed and average production). The information is organized into tables for comparison and the text draws some overall conclusions in the summary.
Date: 1925
Creator: Adams, William W.
Partner: UNT Libraries Government Documents Department
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Review of Safety and Health Conditions in the Mines at Butte

Description: From Introduction: "This review of safety and health conditions in the mines of Butte, Mont., is prepared from data gathered during the period 1916 to 1924, inclusive, chiefly by Daniel Harrington, who was until recently supervising mining engineer of the Bureau of Mines."
Date: 1925
Creator: Rice, G. S. & Sayers, R. R.
Partner: UNT Libraries Government Documents Department
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The Treatment of Manganese-Silver Ores

Description: Report presenting studies regarding the treatment of manganese-silver ores.
Date: 1925
Creator: Clevenger, Galen H. & Caron, Martinus H.
Partner: UNT Libraries Government Documents Department
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Garnet: Its Mining, Milling, and Utilization

Description: From Introduction: "This bulletin presents the results of an investigation conducted by the Bureau of Mines as part of its work for the increase of efficiency and the prevention of waste in the mineral industries."
Date: 1925
Creator: Myers, W. M. & Anderson, C. O.
Partner: UNT Libraries Government Documents Department
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Explosion Hazards From the Use of Pulverized Coal at Industrial Plants

Description: From Introduction: "This bulletin, therefore, presents both bad and the good features of pulverized-coal plants and gives recommendations for safe installation and operation. Consequently, in the preparation of this bulletin much of the material on explosions in plants is based on the results of tests at the experimental mine and in the laboratory dust gallery."
Date: 1925
Creator: Tracy, L. D.
Partner: UNT Libraries Government Documents Department
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