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Tabulated Analyses of Texas Crude Oils

Description: Report issued by the Bureau of Mines discussing analyses of Texas crude oils. As stated in the introduction, "this paper makes available in condensed tabular form under one cover all analyses of Texas crude oils made by the Bureau of Mines to March 1939" (p. 1). This report includes tables, and a map.
Date: 1939
Creator: Kraemer, A. J. & Wade, Gustav
Partner: UNT Libraries Government Documents Department

Metal-Mining Practice

Description: Report discussing mining practices of a large number of metal mines in the United States and foreign countries and the adaptation of mining methods best suited to the various natural conditions in mines and their comparative costs. This bulletin is concerned primarily with mining or ore production and discusses milling and marketing only in brief.
Date: 1939
Creator: Jackson, Charles F. & Hedges, J. H.
Partner: UNT Libraries Government Documents Department

Report of the Twenty-Eighth National Conference on Weights and Measures, 1938

Description: Report of the annual conference on weights and measures, hosted by the U.S. National Bureau of Standards in Washington D.C. It includes conference proceedings, a list of attendees, information about committees and officers, and other reports or commentaries discussed at the meetings.
Date: 1939
Creator: United States. National Bureau of Standards.
Partner: UNT Libraries Government Documents Department

Metal-Mine Accidents in the United States During the Calendar Year 1936

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: 1939
Creator: Adams, W. W. & Kolhos, M. E.
Partner: UNT Libraries Government Documents Department

Practices and Methods of Preventing and Treating Crude-Oil Emulsions

Description: From Introduction: "This report describes practical methods of preventing the formation of emulsions in oil-producing operations, modern practices and methods of economically dehydrating crude-oil emulsions, and recent advances in emulsion-treating technique."
Date: 1939
Creator: Shea, G. B.
Partner: UNT Libraries Government Documents Department

Coal-Mine Accidents in the United States, 1936

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: 1939
Creator: Adams, W. W.; Geyer, L. E. & Parry, M. G.
Partner: UNT Libraries Government Documents Department

Coal Mining in Europe: A Study of Practices in Different Coal Formations and Under Various Economic and Regulatory Conditions Compared with Those in the United States

Description: From Introduction: "The major purpose of this bulletin, as indicated in the preface by Dr. John W. Finch, Director of the Bureau of Mines, is to give a critical review of the coal-mining methods used in the principal producing countries of Europe, to describe the reasons underlying the adoption of these methods, and to contrast them with coal-mining methods employed in the United States."
Date: 1939
Creator: Rice, George S. & Hartmann, Irving
Partner: UNT Libraries Government Documents Department

Static Electricity in Nature and Industry

Description: From Introduction: "In this bulletin "static electricity" is used in its commonly accepted meaning to include the various manifestations that result from the coming together or neutralization of positive and negative charges with have been separated by friction between unlike substances or otherwise. Although the scope of the this report is rather broad, it deals primarily with static electricity as a hazard. Casual and experimental observations recorded herein are thus given for a background and for the purpose of suggesting hazards not yet recognized."
Date: 1939
Creator: Guest, Paul G.
Partner: UNT Libraries Government Documents Department

Preliminary Report on the Characteristics of the N.A.C.A. 4400R Series Airfoils

Description: Report presenting tests made in the variable-density wind tunnel of airfoils of the NACA 4400 series modified by reflex at the trailing edge designed to reduce the pitching moment to the value of -0.03. The modified airfoils are designated the NACA 4400R series.
Date: March 1939
Creator: Sherman, Albert
Partner: UNT Libraries Government Documents Department

Some Notes on the Numerical Solution of Shear-Lag and Mathematically Related Problems

Description: "The analysis of box beams with shear deformation of the flanges can be reduced to the solution of a differential equation. The same equation is met in other problems of stress analysis. No analytical solutions of this equation can be given for practical cases, and numerical methods of evaluation must be used. Available methods are briefly discussed. Two numerical examples show the application of the step-by-step method of integration to shear-lag problems" (p. 1).
Date: May 1939
Creator: Kuhn, Paul
Partner: UNT Libraries Government Documents Department

A Theoretical Study of the Moment on a Body in a Compressible Fluid

Description: "The extension to a compressible fluid of Lagally's theorem on the moment on a body in an incompressible fluid and Poggi's method of treating the flow of compressible fluids are employed for the determination of the effect of compressibility on the moment of an arbitrary body. Only the case of the two-dimensional subsonic flow of an ideal compressible fluid is considered. As examples of the application of the general theory, two well-known systems of profiles are treated; namely the elliptic profile and the symmetrical Joukowski profiles with sharp trailing edges" (p. 581).
Date: March 24, 1939
Creator: Kaplan, Carl
Partner: UNT Libraries Government Documents Department

Measurements of the Air-Flow Velocity in the Cylinder of an Airplane Engine

Description: The object of the present investigation is to determine the velocity in the BMW-VI cylinder of an externally driven single-cylinder test engine at high engine speeds using the hot-wire method of Ulsamer.
Date: December 1939
Creator: Wenger, Hermann
Partner: UNT Libraries Government Documents Department

Investigations and Experiments in the Guidonia Wind Tunnel

Description: This paper is a presentation of the experiments and equipment used in investigations at the Guidonia wind tunnel. The equipment consisted of: a number of subsonic and supersonic cones, an aerodynamic balance, and optical instruments operating on the Schlieren and interferometer principle.
Date: July 1939
Creator: Ferri, Antonio
Partner: UNT Libraries Government Documents Department

Investigations and Tests in the Towing Basin at Guidonia

Description: The experimental methods at the Guidonia towing basin are discussed including specifications. Some of the components examined are the bridge towing carriage, side towing carriage, catapult installation, and dynamometer systems. Tests were performed on hulls and floats, as well as motor boats and torpedo shaped bodies. Theoretical investigations were also performed to determine pressure distributions on geometrically simple bodies, propagation of small wave motions, and planing and submerged surfaces.
Date: April 1939
Creator: Cremona, C.
Partner: UNT Libraries Government Documents Department

Measurement of the True Dynamic and Static Pressures in Flight

Description: In this report, two reliable methods are presented, with the aid of which the undisturbed flight dynamic pressure and the true static pressure may be determined without error. These problems were solved chiefly through practical flight tests.
Date: October 1939
Creator: Kiel, Georg
Partner: UNT Libraries Government Documents Department

Local Instability of Centrally Loaded Columns of Channel Section and Z-Section

Description: "Charts are presented for the coefficients in formulas for the critical compressive stress at which cross-sectional distortion begins in a thin-wall member with either a channel section or a Z-section with identical flanges. The energy method of Timoshenko was used in the theoretical calculations required for the construction of the charts. The deflection equations were carefully selected to give good accuracy. The calculation of the critical compressive stress at stresses beyond the elastic range is briefly discussed. In order to demonstrate the use of the formulas and the charts in engineering calculations, two illustrative problems are included" (p. 1).
Date: August 1939
Creator: Lundquist, Eugene E.
Partner: UNT Libraries Government Documents Department

Loads Imposed on Intermediate Frames of Stiffened Shells

Description: "The loads imposed on intermediate frames by the curvature of the longitudinal and by the diagonal-tension effects are treated. A new empirical method is proposed for analyzing diagonal-tension effects. The basic formulas of the pure diagonal-tension theory are used, and the part of the total shear S carried by diagonal tension is assumed to be given the expression S (sub DT) = S (1-tau sub o/tau)(sup n) where tau (sub o) is the critical shear stress, tau the total (nominal shear stress), and n = 3 - sigma/tau where sigma is the stress in the intermediate frame. Numerical examples illustrate all cases treated" (p. 1).
Date: February 1939
Creator: Kuhn, Paul
Partner: UNT Libraries Government Documents Department

Photoelastic Analysis of Three-Dimensional Stress Systems Using Scattered Light

Description: "A method has been developed for making photoelastic analyses of three-dimensional stress systems by utilizing the polarization phenomena associated with the scattering of light. By this method, the maximum shear and the directions of the three principal stresses at any point within a model can be determined, and the two principal stresses at a free-bounding surface can be separately evaluated. Polarized light is projected into the model through a slit so that it illuminates a plane section" (p. 1).
Date: November 1939
Creator: Weller, R. & Bussey, J. K.
Partner: UNT Libraries Government Documents Department

Pressure-Distribution Investigation of an N.A.C.A. 0009 Airfoil With a 50-Percent-Chord Plain Flap and Three Tabs

Description: "Pressure-distribution tests of an N.A.C.A. 0009 airfoil with a 50-percent-chord plain flap and three plain tabs, having chords 10, 20, and 30 percent of the flap chord, were made in the N.A.C.A. 4- by 6- foot vertical tunnel. The tests supplied aerodynamic section data that may be applied to the design of horizontal and vertical tail surfaces. The results are presented as resultant-pressure diagrams for the airfoil with the flap and the 20-percent-chord tab" (p. 1).
Date: November 1939
Creator: Street, William G. & Ames, Milton B., Jr.
Partner: UNT Libraries Government Documents Department

Local Instability of Symmetrical Rectangular Tubes Under Axial Compression

Description: "A chart is presented for the coefficient in the formula for the critical compressive stress at which cross sectional distortion begins in a thin-wall tube of rectangular section symmetrical about its two principal axes. The energy method of Timoshenko was used in the theoretical calculations required for the construction of the chart. The deflection equation used in this method was selected to give good accuracy" (p. 1).
Date: February 1939
Creator: Lundquist, Eugene E.
Partner: UNT Libraries Government Documents Department

Report on Ice Formation on Aircraft

Description: The physical phenomena involved in the icing of aircraft have been analyzed and measured. Recommendations on warning devices are made as well as the different types of ice and glazing that can occur on airplanes are examined and discussed.
Date: November 1939
Partner: UNT Libraries Government Documents Department

Ice Formation on Wings

Description: This report makes use of the results obtained in the Gottingen ice tunnel in which the atmospheric conditions are simulated and the process of ice formation photographed. The effect of ice formation is threefold: 1) added weight to the airplane; 2) a change in the lift and drag forces; 3) a change in the stability characteristics.
Date: February 1939
Creator: Ritz, L.
Partner: UNT Libraries Government Documents Department

Propeller Tests to Determine the Effect of Number of Blades at Two Typical Solidities

Description: "Propellers with equal total blade area, but with different numbers, were tested at Stanford University. The tests show generally that, for equal total blade area, propellers with the larger number of blades absorb the greater power and, provided hubs have equal drag, develop the higher efficiency. It is shown that the differences found are in agreement, qualitatively, with what might be predicted from simple blade-element theory" (p. 1).
Date: April 1939
Creator: Lesley, E. P.
Partner: UNT Libraries Government Documents Department

Heat-Transfer Tests of a Steel Cylinder Barrel With Aluminum Fins

Description: Report presenting tests conducted on a steel cylinder barrel with aluminum fins in order to determine the heat-transfer coefficients of the cylinder and the excellence of the bond between the steel barrel and the aluminum fins. Results regarding the heat-transfer tests and physical tests are provided.
Date: August 1939
Creator: Ellerbrock, Herman H., Jr.
Partner: UNT Libraries Government Documents Department