Technical Report Archive and Image Library (TRAIL) - 117 Matching Results

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Model tests on the economy and effectiveness of helicopter propellers

Description: The average velocity of helicopter blades relative to the air is greater than that of airplane wings. The helicopter may turn out to be more economical than the airplane wing for extreme velocities of horizontal flight, the airplane then requiring a very great speed range.
Date: January 1, 1925
Creator: Munk, Max M.
Partner: UNT Libraries Government Documents Department

Wind tunnel tests of fuselages and windshields

Description: The tests described herein were made in 1918, in the old four-foot wind tunnel at the Massachusetts Institute of Technology and at the request of the Engineering Division of the U.S. Army Air Service. The results were given circulation only in official circles at that time. The interest of the work appears sufficient to justify its wider distribution even at this very late date.
Date: September 1, 1925
Creator: Warner, Edward P.
Partner: UNT Libraries Government Documents Department

The velocity distribution caused by an airplane at the points of a vertical plane containing the span

Description: A formula for the computation of the vertical velocity component on all sides of an airplane is deduced and discussed. The formation is of value for the interpretation of such free flight tests where two airplanes fly alongside each other to facilitate observation.
Date: March 1, 1925
Creator: Munk, Max M.
Partner: UNT Libraries Government Documents Department

The comparison of well-known and new wing sections tested in the variable density wind tunnel

Description: Three groups of airfoils have been tested in the variable density wind tunnel. The first group contains three airfoils. The second group is a systematic series of twenty-seven airfoils. The third group consists of several frequently used wing sections.
Date: May 1925
Creator: Higgins, George J.
Partner: UNT Libraries Government Documents Department

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

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

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

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

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

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

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

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

Quarry Accidents in the United States During the Calendar Year 1923

Description: Report published by the U.S. Bureau of Mines which is a compilation of accidents in quarries located in the United States with data regarding the number and kinds of accidents as well as information about the mining operations (e.g., number of men employed, kinds of quarries, amount of work performed, etc.).
Date: 1925
Creator: Adams, William W.
Partner: UNT Libraries Government Documents Department