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  Partner: UNT Libraries Government Documents Department
 Decade: 1940-1949
 Year: 1940
Coal-Mine Accidents in the United States, 1937

Coal-Mine Accidents in the United States, 1937

Date: 1940
Creator: Adams, William W.
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.
Contributing Partner: UNT Libraries Government Documents Department
Quarry Accidents in the United States During the Calendar Year 1938

Quarry Accidents in the United States During the Calendar Year 1938

Date: 1940
Creator: Adams, William W.
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.).
Contributing Partner: UNT Libraries Government Documents Department
Quarry Accidents in the United States During the Calendar Year 1937

Quarry Accidents in the United States During the Calendar Year 1937

Date: 1940
Creator: Adams, William Waugh & Wrenn, Virginia E.
Description: Report issued by the Bureau of Mines over quarry accidents in the U.S. during 1937. The number, type, and location of the accidents are presented and discussed. This report includes tables.
Contributing Partner: UNT Libraries Government Documents Department
Extension of pack method for compressive tests

Extension of pack method for compressive tests

Date: December 1, 1940
Creator: Aitchison, C S
Description: The pack method for determining compressive stress-strain graphs described in NACA Report No. 649 has been modified to extend it's application to thinner gages and stronger materials. The principal modifications consisted in the provision of additional support against instability cementing the specimens of the pack together with fused shellac and the provision of special clamps to hold the specimens together while the test is in progress. The shellac was found to increase the buckling load of the pack without any appreciable effect on the compressive stress-strain graph of the material. The extended pack method described in this note has made possible the application of stresses in excess of 220 kips per square inch to sheet material having a thickness of only 0.02 inch.
Contributing Partner: UNT Libraries Government Documents Department
Reconnaissance of Gold-Mining Districts in the Black Hills, South Dakota

Reconnaissance of Gold-Mining Districts in the Black Hills, South Dakota

Date: 1940
Creator: Allsman, Paul T.
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Pressure-distribution investigation on an NACA 0009 airfoil with a 30-percent-chord plain flap and three tabs

Pressure-distribution investigation on an NACA 0009 airfoil with a 30-percent-chord plain flap and three tabs

Date: May 1, 1940
Creator: Ames, Milton B
Description: Pressure-distribution tests of an NACA 0009 airfoil with a 30-percent-chord plain flap and three plain tabs, having chords 10, 20, and 30 percent of the flap chord, were made. The purpose of these tests was to continue an investigation to supply structural and aerodynamic section data that may be applied to the design of horizontal and vertical tail surfaces. The results are presented as diagrams of resultant pressures and of resultant-pressure increments for the airfoil with the flap and the 20-percent-chord tab. Increments of normal-force and hinge-moment coefficients for the airfoil, the flap, and the three tabs are also given. At all unstalled flap and tab deflections, the experimental distributions agree well with those calculated by an analytical method. The agreement is poor, however, then the stalled or the unstalled condition of the flap or tab deflected alone was changed to an unstalled or stalled condition by the simultaneous deflection of both the flap and the tab.
Contributing Partner: UNT Libraries Government Documents Department
Pressure-distribution investigation of an NACA 0009 airfoil with an 80-percent-chord plain flap and three tabs

Pressure-distribution investigation of an NACA 0009 airfoil with an 80-percent-chord plain flap and three tabs

Date: May 1, 1940
Creator: Ames, Milton B , Jr
Description: Pressure-distribution tests of an NACA 0009 airfoil with an 80-percent-chord plain flap and three plain tabs, having chord of 10, 20, and 30 percent of the flap chord, were made. Section data suitable for application to the design of horizontal and vertical tail surfaces were obtained. Resultant-pressure diagrams for the airfoil with the flap and the 20-percent-chord tab are presented. Plots are also given of increments of normal-force and hinge-moment coefficients for the airfoil, the flap, and the three tabs. A comparison of some characteristic slopes for the 30-, the 50-, and the 80-percent-chord flaps, tested in the general investigation of plain flaps for control surfaces, is included. Section aerodynamic and load data have been made available for a wide range of flap and a tab chords to be used on an NACA 0009 airfoil or on other conventional sections.
Contributing Partner: UNT Libraries Government Documents Department
Wind-tunnel investigation of two airfoils with 25-percent-chord Gwinn and plain flaps

Wind-tunnel investigation of two airfoils with 25-percent-chord Gwinn and plain flaps

Date: May 1, 1940
Creator: Ames, Milton B , Jr
Description: Aerodynamic force tests of an NACA 23018 airfoil with a Gwinn flap having a chord 25 percent of the overall chord and of an NACA 23015 airfoil with a plain flap having a 25-percent chord were conducted to determine the relative merits of the Gwinn and the plain flaps. The tests indicated that, based on speed-range ratios, the plain flap was more effective than the Gwinn flap. At small flap deflections, the plain flap had lower drag coefficients at lift-coefficient values less than 0.70. For lift coefficients greater than 0.70, however, the Gwinn flap at all downward flap deflections had the lower drag coefficients.
Contributing Partner: UNT Libraries Government Documents Department
Safety Factors in Construction and Ventilation, Wawona Vehicular Tunnel, Yosemite National Park, California

Safety Factors in Construction and Ventilation, Wawona Vehicular Tunnel, Yosemite National Park, California

Date: 1940
Creator: Ash, S. H.
Description: Report issued by the Bureau of Mines discussing the safety and ventilation hazards presented during the construction of the Wawona tunnel in Yosemite National Park. Safety precautions and procedures used during the construction are presented. This report includes tables, illustrations, and photographs.
Contributing Partner: UNT Libraries Government Documents Department
Farm horseshoeing.

Farm horseshoeing.

Date: 1940
Creator: Asmus, Henry, 1873-1939. & Williams, J. O. (John Oscar), 1885-
Description: Describes the need for shoeing horses, and the steps that should be taken to successfully shoe horses on the farm.
Contributing Partner: UNT Libraries Government Documents Department
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