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Electric Shot-Firing in Mines, Quarries, and Tunnels

Description: From Introduction: "Data collected by the Bureau of Mines indicate the United States a large percentage of the blasting in quarries, shafts, and tunnels, and from 15 to 25 percent of the blasts in mining operations, are set off electrically. The Bureau of Mines is interested in electric shot-firing because of its use in mining, and especially because electric methods, when properly applied, are undoubtedly safer than other methods commonly used."
Date: 1926
Creator: Ilsley, L. C. & Hooker, A. B.
Partner: UNT Libraries Government Documents Department
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Manual of Testing Methods for Oil Shale and Shale Oil

Description: From Introduction: "This paper is presented, therefore, as a manual of apparatus and methods that the bureau has developed for work on oil shale and found satisfactory for routine tests and for research. Explanation and discussion of the principles underlying the methods of testing are included wherever necessary for a clearer understanding."
Date: 1926
Creator: Karrick, Lewis C.
Partner: UNT Libraries Government Documents Department
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Oil-Field Emulsions

Description: From Introduction: "This bulletin deals entirely with the cause and removal of water emulsified in crude petroleum and the colloidal theories involved."
Date: 1926
Creator: Dow, D. B.
Partner: UNT Libraries Government Documents Department
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Beneficiation and Utilization of Georgia Clays

Description: From Introduction: "This report is divided into six parts as follows: (1) Occurrence of clays in Georgia and the source of the clays tested; (2) washing tests; (3) physical test; (4) utilization of kaolins white ware; (5) utilization of clays in refractories; and (6) utilization of clays in face brick."
Date: 1926
Creator: Stull, R. T. & Bole, G. A.
Partner: UNT Libraries Government Documents Department
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Possibilities for the Commercial Utilization of Peat

Description: From Introduction: "The characteristics of the numerous varieties and types of peat and their geographic distribution in the United States have been discussed at length in those publications. This report therefore considers these topics only in their relation to the subjects specified in the following act (40 Stat. 1154) authorizing the investigation described herein."
Date: 1926
Creator: Odell, W. W. & Hood, O. P.
Partner: UNT Libraries Government Documents Department
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Quarry Accidents in the United States During the Calendar Year 1924

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: 1926
Creator: Adams, William W.
Partner: UNT Libraries Government Documents Department
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Metal-Mine Accidents in the United States During the Calendar Year 1924

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: 1926
Creator: Adams, William W.
Partner: UNT Libraries Government Documents Department
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Underground Limestone Mining

Description: From Introduction: "The aim of the report is to help the superintendent and the operator to adopt the safest and most efficient methods of removing rock underground."
Date: 1926
Creator: Thoenen, J. R.
Partner: UNT Libraries Government Documents Department
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Coal-Mine Fatalities in the United States, 1925

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: 1926
Creator: Adams, William W.
Partner: UNT Libraries Government Documents Department
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An investigation of the characteristics of steel diaphragms for automatic fuel-injection valves

Description: "This research on steel diaphragms was undertaken at the Langley Memorial Aeronautical Laboratory, as a part of a general investigation on fuel injection engines for aircraft. The work determined the load-deflection, load- deformation and hysteresis characteristics for single diaphragms having thicknesses from 0.00s inch to 0.012 inch, and for similar diaphragms tested in multiple having total thicknesses from 0.012 inch to 0.180 inch. The elastic limit loads and deflections, and rupture points… more
Date: April 1926
Creator: Joachim, W. F.
Partner: UNT Libraries Government Documents Department
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Propeller Design: Practical Application of the Blade Element Theory 1

Description: "This report is the first of a series of four on propeller design and contains a description of the blade elements or modified Drzewiecke theory as used in the Bureau of Aeronautics, U.S. Navy Department. Blade interference corrections are used which were taken from R.& M. NO. 639 of the British Advisory Committee for Aeronautics. The airfoil characteristics used were obtained from tests of model propellers, not from tests of model wings" (p. 1).
Date: May 1926
Creator: Weick, Fred E.
Partner: UNT Libraries Government Documents Department
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Propeller Design: Extension of Test Data on a Family of Model Propellers by Means of the Modified Blade Element Theory 2

Description: This report is the second of a series of four on propeller design, and describes the method used to extend the data obtained from tests on a family of thirteen model propellers to include all propellers of the same form likely to be met in practice. This necessitates the development of a method of propeller analysis which when used to calculate the powers and efficiencies gives results which check the tests throughout their range.
Date: May 1926
Creator: Weick, Fred E.
Partner: UNT Libraries Government Documents Department
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Propeller Design - A Simple System Based on Model Propeller Test Data -III

Description: "This report, the third of a series of four, describes a simple system for designing propellers of a standard form. In this report, the system is based on tests of a family of model propellers of standard Navy form, the data from which have been extended by means of calculations to cover the complete range likely to be found in practice. However, it can be worked out for any family having propellers of one general form" (p. 1).
Date: May 1926
Creator: Wieck, Fred E.
Partner: UNT Libraries Government Documents Department
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Propeller Design - A Simple Method for Determining the Strength of Propellers - IV

Description: "The object of this report, the last of a series of four on propeller design, is to describe a simple method for determining whether the strength of a propeller of a standard form is sufficient for safe operation. An approximate method of stress analysis is also given" (p. 1).
Date: June 1926
Creator: Weick, Fred E.
Partner: UNT Libraries Government Documents Department
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Steam Power Plants in Aircraft

Description: "The employment of steam power plants in aircraft has been frequently proposed. Arguments pro and con have appeared in many journals. It is the purpose of this paper to make a brief analysis of the proposal from the broad general viewpoint of aircraft power plants. Any such analysis may be general or detailed" (p. 1).
Date: June 1926
Creator: Wilson, E. E.
Partner: UNT Libraries Government Documents Department
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The N.A.C.A. CYH airfoil section

Description: The NACA CYH airfoil section is described and its aerodynamic characteristics are given as tested in the NACA variable density wind tunnel at twenty atmosphere pressure. This section has a low drag, a high maximum lift, and a small travel of center of pressure.
Date: June 1926
Creator: Higgins, George J.
Partner: UNT Libraries Government Documents Department
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The Spacing of Orifices for the Measure of Pressure Distributions

Description: "The following report has been prepared for publication by the NACA. Suitable locations of orifices for the measurement of pressure distributions have been discussed. Tables are given for quickly laying out these locations and for quickly and easily computing the resultant air forces from the result of the measurements" (p. 1).
Date: January 1926
Creator: Munk, Max M.
Partner: UNT Libraries Government Documents Department
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The Resistance to the Steady Motion of Small Spheres in Fluids

Description: "There seems to be little reliable information conveniently available as to the resistance encountered by small spheres moving steadily at moderate speeds in fluids. The present paper, while presenting nothing new in the way of either theory or data, has three objects: first to show that published data are sufficient to furnish approximate information; second to present this information in form convenient for computation; and, third to indicate where further research is needed" (p. 1).
Date: February 1926
Creator: Castleman, R. A.
Partner: UNT Libraries Government Documents Department
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The Lateral Failure of Spars

Description: It was concluded that after the critical span or depth-breadth ratio has been reached, the modulus of rupture varies approximately inversely as the first power of the span and of the depth-breadth ratio. The direction of the lateral deflection is alternate between successive supports. For this reason, we believe that rib spacing along the spar is more important in reducing lateral deflection than the distance between supports at the strut points.
Date: March 1926
Creator: Bromley, Stevens & Robinson, William H., Jr.
Partner: UNT Libraries Government Documents Department
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N.A.C.A. Flight-Path Angle and Air-Speed Recorder

Description: "A new trailing bomb-type instrument for photographically recording the flight-path angle and air speed of aircraft in unaccelerated flight is described. The instrument consists essentially of an inclinometer, air-speed meter and a film-drum case. The inclinometer carries an oil-damped pendulum which records optically the flight-path angle upon a rotating motor-driven film drum. The air-speed meter consists of a taut metal diaphragm of high natural frequency which is acted upon by the pressure … more
Date: April 1926
Creator: Coleman, Donald G.
Partner: UNT Libraries Government Documents Department
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Tests of Several Bearing Materials Lubricated by Gasoline

Description: "This investigation on the relative wear of several bearing materials lubricated by gasoline was conducted at the Langley Memorial Aeronautical Laboratory, as part of a general research on fuel injection engines for aircraft. The specific purpose of the work was to find a durable bearing material for gear pumps to be used for the delivery of gasoline and diesel engine fuel oil at moderate pressures to the high pressure pumps of fuel injection engines" (p. 1).
Date: July 1926
Creator: Joachim, W. F. & Case, Harold W.
Partner: UNT Libraries Government Documents Department
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The characteristics of the N.A.C.A. M-12 airfoil section

Description: The data obtained on the NACA M-12 airfoil, tested at twenty atmosphere density in the NACA variable density wind tunnel, have been extended by additional tests at one and at twenty atmospheres under improved conditions. The results of these tests are given. Considerable scale effect was found.
Date: August 1926
Creator: Higgins, George J.
Partner: UNT Libraries Government Documents Department
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Navy Propeller Section Characteristics as Used in Propeller Design

Description: "This report contains artificial aerodynamic characteristics of a set of propeller sections to be used in designing propellers by means of the blade element theory. Characteristics computed from model propeller tests for a single section are extended to cover sections of Navy propeller sections at high Reynolds Number in the variable density tunnel of the NACA" (p. 1).
Date: August 1926
Creator: Weick, Fred E.
Partner: UNT Libraries Government Documents Department
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