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Metal-Mine Accidents in the United States During the Calendar Years: 1933-34

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: 1936
Creator: Adams, William W. & Kolhos, M. E.
Partner: UNT Libraries Government Documents Department
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Microscopic Structure and Concentratability of the Important Iron Ores of the United States

Description: Outline of Problem: "This paper covers a survey of 19 ores collected from seven of the more important iron-ore districts of the United States and is a contribution by the ore-dressing section of the United States Bureau of Mines to general research program on iron and steel being conducted by the Bureau."
Date: 1936
Creator: Cooke, S. R. B.
Partner: UNT Libraries Government Documents Department
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Concentration of Copper Ores in North America

Description: From Introduction: "This bulletin summarizes and discusses copper-concentrator methods, results, and costs from 1929 to 1931 and includes an account of trends and developments in the industry."
Date: 1936
Creator: Chapman, Thomas G.
Partner: UNT Libraries Government Documents Department
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Contributions to the Data on Theoretical Metallurgy: [Part] 5. Heats of Fusion of Inorganic Substances

Description: From Introduction: "Examples of the use of the derived heat-of-fusion values in the application of thermodynamics to problems concerning metallurgical practice are not given here, but the reader is referred to the textbook of Lewis and Randall (454), in which the methods and types of calculations are adequately portrayed, and to the papers of Maier (469, 470, 471), in which the application of thermodynamic methods to various problems of metallurgical interest has been illustrated and discussed."
Date: 1936
Creator: Kelley, K. K.
Partner: UNT Libraries Government Documents Department
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Sampling and Examination of Mine Gases and Natural Gas: A Revision of Bulletin 42

Description: Revision of a report by the U.S. Bureau of Mines which described experiments performed in Pittsburgh, Pennsylvania to study mine gases. According to the foreword: "Much of the material is reprinted on the following pages in its original form, and changes have been made only where manifestly necessary. Laboratory methods have been brought up to date. Some types of apparatus described in Bulletin 42 have now become obsolete and newer designs are described instead" (p. 1).
Date: 1936
Creator: Burrell, George A. & Seibert, Frank M.
Partner: UNT Libraries Government Documents Department
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Sponge-Iron Experiments at Mococo

Description: From Forward: "This bulletin covers one phase of the program of the Metallurgical Division of the Bureau of Mines on the direct production of iron from its ores. Another phase of this program has been covered in Bulletin 391, Microscopic Structure and Concentratability of the Important Iron Ores of the United States, by S. R. B. Cooke. Methods of iron-core concentration will be discussed in future bulletins."
Date: 1936
Creator: Maier, Charles G.
Partner: UNT Libraries Government Documents Department
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Coal-Mine Accidents in the United States, 1934

Description: Report compiled by the U.S. Bureau of Mines including statistics on fatal and non-fatal accidents 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: 1936
Creator: Adams, W. W.; Geyer, L. E. & Parry, M. G.
Partner: UNT Libraries Government Documents Department
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Contributions to the Data on Theoretical Metallurgy: [Part] 6. A Revision of the Entropies of Inorganic Substances--1935

Description: From Introduction: "Moreover, a critical study of the existing vapor-pressure data made by the author (98) furnishes entropy of vaporization results suitable for obtaining approximate values of the entropies of a number of gases from the entropies of the solids or liquids. Consequently, it appears worth while at the present time to supplement the former publication, giving the new values now obtainable and making such revision in the older values as the data warrant."
Date: 1936
Creator: Kelley, K. K.
Partner: UNT Libraries Government Documents Department
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Quarry Accidents in the United States During the Calendar Year 1934

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: 1936
Creator: Adams, William W. & Wrenn, Virginia E.
Partner: UNT Libraries Government Documents Department
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United States Earthquakes, 1936

Description: Report discussing earthquake activity in the United States during 1936. The report is broken down by regions and has sections for specific earthquakes.
Date: 1936
Partner: UNT Libraries Government Documents Department
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An Approximate Spin Design Criterion for Monoplanes

Description: "An approximate empirical criterion, based on the projected side area and the mass distribution of the airplane, was formulated. The British results were analyzed and applied to American designs. A simpler design criterion, based solely on the type and the dimensions of the tail, was developed; it is useful in a rapid estimation of whether a new design is likely to comply with the minimum requirements for safety in spinning" (p. 1).
Date: June 1936
Creator: Seidman, Oscar & Donlan, Charles J.
Partner: UNT Libraries Government Documents Department
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Combustion-engine temperatures by the sodium line-reversal method

Description: The sodium line-reversal method has been used in some preliminary measurements of flame temperature. Improvements in the method involving a photographic recorder and a means of correcting for the dirtiness of the windows are described. The temperatures so obtained are compared with those calculated from pressure diagrams.
Date: March 1936
Creator: Brevoort, Maurice J.
Partner: UNT Libraries Government Documents Department
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A Comparison of Corrosion-Resistant Steel (18 Percent Chromium - 8 Percent Nickel) and Aluminum Alloy (24st)

Description: "In the selection of materials for aircraft application, it is not enough to make the selection on a strength-weight basis alone. A strength-weight comparison is significant but other factors must be considered, for while a material with a high ratio of strength to weight may be perfectly satisfactory for one use, it may be totally unfitted for another. It is essential, among other things, that the probable nature, magnitude, and direction of the principal stresses be given special consideration" (p. 1).
Date: March 1936
Creator: Sullivan, J. E.
Partner: UNT Libraries Government Documents Department
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Full-scale wind-tunnel to determine a satisfactory location for a service Pitot-static tube on a low-wing monoplane

Description: Surveys of the air flow over the upper surface of four different airfoils were made in the full-scale wind tunnel to determine a satisfactory location for a fixed Pitot-static tube on a low-wing monoplane. The selection was based on small interference errors, less than 5 percent, and on a consideration of structural and ground handling problems. The most satisfactory location on the airfoils without flaps that were investigated was 10 percent of the chord aft and 25 percent of the chord above the trailing edge of a section approximately 40 percent of the semispan inboard of the wing tip. No satisfactory location was found near the wing when the flaps were deflected.
Date: March 1936
Creator: Parsons, John F.
Partner: UNT Libraries Government Documents Department
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Remarks on the Elastic Axis of Shell Wings

Description: The definitions of flexural center, torsional center, elastic center, and elastic axis are discussed. The calculation of elastic centers is dealt with in principle and a suggestion is made for the design of shear webs.
Date: April 1936
Creator: Kuhn, Paul
Partner: UNT Libraries Government Documents Department
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Tank tests of models of floats for single-float seaplanes - First series

Description: "Large models of the Mark V and Mark VI floats used for single float seaplanes (National Advisory Committee for Aeronautics (NACA) models 41-A and 41-B, respectively) were tested in the NACA tank to provide general test data for typical single floats and a basis for possible improvements of their form. The resistance of model 41-B was greater than that of model 41-A, either when free to trim or at the best trim angle for each. The resistance of model 35-B (a pointed step hull tested free to trim) was less than either of the models at the hump speed, greater at intermediate planing speeds, and less at the speeds and loads near get-away, although the spray was generally worse owing to the absence of transverse flare" (p. 1).
Date: April 1936
Creator: Parkinson, J. B.
Partner: UNT Libraries Government Documents Department
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Procedure for determining speed and climbing performance of airships

Description: From Summary: "The procedure for obtaining air-speed and rate-of-climb measurements in performance tests of airships is described. Two methods of obtaining speed measurements, one by means of instruments in the airship and the other by flight over a measured ground course, are explained. Instruments, their calibrations, necessary correction factors, observations, and calculations are detailed for each method, and also for the rate-of-climb tests. A method of correction for the effect on density of moist air and a description of other methods of speed course testing are appended."
Date: April 1936
Creator: Thompson, F. L.
Partner: UNT Libraries Government Documents Department
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Tank Tests of a Model of the NC Flying-Boat Hull - N.A.C.A. Model 44

Description: "A 1/7.06 full-size model of the NC-type hull was tested in the N.A.C.A. tank by both the general method and the specific or free-to-trim method. The results of the tests are given in curves plotted as non dimensional coefficients and are compared with the test results of N.A.C.A. model 11-A. The NC model (N.A.C.A. model 44) shows higher resistance than model 11-A at hump speed but lower resistance at high speeds. Model 44 has a higher best trim angle at the jump and a lower maximum positive trimming moment than model 11-A. At high speeds the best trim angle and the trimming moments of the two models are approximately the same" (p. 1).
Date: May 1936
Creator: Bell, Joe W.
Partner: UNT Libraries Government Documents Department
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Tests of N.A.C.A. airfoils in the variable-density wind tunnel. Series 230

Description: The results of tests of six airfoils having the N.A.C.A. 230 mean line and varying in thickness from 0.06c to 0.21c are presented. These results agree with previous findings in showing that aerodynamically the best section is one of moderate thickness. The data are of value mainly in connection with the design of tapered wings having sections based on the N.A.C.A. 230 mean line.
Date: May 1936
Creator: Jacobs, Eastman N. & Pinkerton, Robert M.
Partner: UNT Libraries Government Documents Department
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Calculated Effect of Various Types of Flap on Take-Off Over Obstacles

Description: "In order to determine whether or not flaps could be expected to have any beneficial effect on take-off performance, the distances required to take off and climb to an altitude of 50 feet were calculated for hypothetical airplanes, corresponding to relatively high-speed types and equipped with several types of flap. The types considered are the Fowler wing, the Hall wing, the split flap, the balanced split flap, the plain flap, and the external-airfoil flap. The results indicate that substantial reductions in take-off distance are possible through the use of flaps, provided that the proper flap angle corresponding to a given set of conditions is used" (p. 1).
Date: May 1936
Creator: Wetmore, J. W.
Partner: UNT Libraries Government Documents Department
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Performance of Air-Cooled Engine Cylinders Using Blower Cooling

Description: "An investigation was made to obtain information on the minimum quantity of air and power required to cool conventional air cooled cylinders at various operating conditions when using a blower. The results of these tests show that the minimum power required for satisfactory cooling with an overall blower efficiency of 100 percent varied from 2 to 6 percent of the engine power depending on the operating conditions. The shape of the jacket had a large effect on the cylinder temperatures. Increasing the air speed over the front of the cylinder by keeping the greater part of the circumference of the cylinder covered by the jacket reduced the temperatures over the entire cylinder" (p. 1).
Date: July 1936
Creator: Schey, Oscar W. & Ellerbrock, Herman H., Jr.
Partner: UNT Libraries Government Documents Department
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Carbon-monoxide indicators for aircraft

Description: Several improvements that have been made on commercially available carbon-monoxide indicators to make them more suitable for aircraft use are described. These improvements include an automatic flow regulator, which permits the use of a simplified instrument on aircraft where a source of suction is available, and a more reliable alarm attachment. A field method for testing instruments on standard samples of carbon monoxide is described. Performance data and instructions in operation and maintenance are given.
Date: July 1936
Creator: Womack, S. H. J. & Peterson, J. B.
Partner: UNT Libraries Government Documents Department
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Tank tests of models of flying boat hulls having longitudinal steps

Description: Four models with longitudinal steps on the forebody were developed by modification of a model of a conventional hull and were tested in the National Advisory Committee for Aeronautics (NACA) tank. Models with longitudinal steps were found to have smaller resistance at high speed and greater resistance at low speed than the parent model that had the same afterbody but a conventional V-section forebody. The models with a single longitudinal step had better performance at hump speed and as low high-speed resistance except at very light loads. Spray strips at angles from 0 degrees to 45 degrees to the horizontal were fitted at the longitudinal steps and at the chine on one of the two step models having two longitudinal steps. The resistance and the height of the spray were less with each of the spray strips than without; the most favorable angle was found to lie between 15 degrees and 30 degrees.
Date: July 1936
Creator: Allison, John M. & Ward, Kenneth E.
Partner: UNT Libraries Government Documents Department
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