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Zinc Smelting from a Chemical and Thermodynamic Viewpoint

Description: Report describing a chemical and thermodynamic overview of zinc smelting. The methods described are not new, but the analysis is deeper and more focused than in previous reports.
Date: 1930
Creator: Maier, C. G.
Partner: UNT Libraries Government Documents Department
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Ventilation of the Large Copper Mines of Arizona

Description: Introduction: "This bulletin discusses ventilation methods, practices, and costs at 11 large copper mines in Arizona, as obtained by brief personal studies and from supplementary information furnished by the mine managements. These mines were visited from December, 1928, to November, 1929, and the methods and practices in use when visited are described in some detail."
Date: 1930
Creator: McElroy, G. E.
Partner: UNT Libraries Government Documents Department
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Permissible Methane Detectors

Description: From Function of Methane Detectors: "The object of this paper is to present to the mining public the results of the permissibility tests of the detectors that have been approved, also to give the results of a series of tests conducted to determine their practicability."
Date: 1930
Creator: Hooker, A. B.; Fene, W. J. & Currie, R. D.
Partner: UNT Libraries Government Documents Department
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Permissible Electric Mine Lamps

Description: From Introduction: "This paper gives a brief account of the introduction of electric lighting in mines, reviews some of the preliminary and approval work on electric mine lamps up to July, 1917, when a previous bulletin on electric lamps was issued, and describes the lamp-approval work from that date of July, 1930."
Date: 1930
Creator: Ilsley, L. C. & Hooker, A. B.
Partner: UNT Libraries Government Documents Department
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Refining of Light Petroleum Distillates

Description: From Scope of Report: "The first part of this report deals with the principal methods of refining light petroleum products, the equipment used, and the effects of the different refining agents. The second part of the report deals with a study of the value of fractionation as an aid to the refining of pressure distillates."
Date: 1930
Creator: Rue, H. P. & Espach, Ralph H.
Partner: UNT Libraries Government Documents Department
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Rock-Strata Gases of the Cripple Creek District, Colorado and Their Effect on Mining

Description: From Introduction: "The presence in the Cripple Creek district, Colo., of irrespirable gas or gases, generally known to consist mainly of nitrogen and carbon dioxide, has been recognized by members of the mining industry in that region almost since underground mining was begun there; the occurrence origin, and possible control of these gases have been discussed in several articles cited at various places in this report. Similar gases have also been studied in other metal-mining districts, as la… more
Date: 1930
Creator: Denny, E. H.; Marshall, K. L.; Fieldner, A. C.; Emery, A. H.; Yant, W. P. & Selvig, W. A.
Partner: UNT Libraries Government Documents Department
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Coal-Mine Fatalities in the United States, 1928

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: 1930
Creator: Adams, William W.
Partner: UNT Libraries Government Documents Department
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Innovations in Copper Leaching Employing Ferric Sulphate-Sulphuric Acid

Description: From Introduction: "The Bureau of Mines has attempted to develop a cheap and efficient solvent that would especially meet the requirements of smaller plants. (See Bibliography). A method of producing this solution from sulphurous products and waste liquors was developed by the bureau and tried successfully on a test-plant scale at the Southwest Experiment Station in cooperation with the department of mining and metallurgy, University of Arizona, Tuscon, Ariz."
Date: 1930
Creator: Keyes, Harmon E.
Partner: UNT Libraries Government Documents Department
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Commercial Possibilities of the Texas-New Mexico Potash Deposits

Description: From Introduction Results of Test: "Among the domestic potash resources which were brought to the attention of the country during and after the war but were not utilized as a source of potash, although they indicated that they might furnish the cheap potash desired, were the potash deposits occurring with the think rock-salt formations of western Texas and southeastern New Mexico."
Date: 1930
Creator: Wroth, James S.
Partner: UNT Libraries Government Documents Department
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Greensand Bibliography to 1930 (Annotated): with a Chapter on Zeolite Water Softeners

Description: From Introduction: "The references given herein to the literature of greensand or glauconite are believed to be complete up to about the end of 1929. The aim in this bibliography has been to include with each important reference a short synopsis, generally checked against the original article. These synopses are believed to be sufficiently complete to present a general view of the original article, and in many items specific parts of the article are included."
Date: 1930
Creator: Shreve, R. Norris
Partner: UNT Libraries Government Documents Department
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Quarry Accidents in the United States During the Calendar Year 1928

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: 1930
Creator: Adams, William W.
Partner: UNT Libraries Government Documents Department
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Potash Bibliography to 1928 (Annotated): Review and Compilation of Technical Literature on Potash Salts (including the Alunites) and Their Foreign Occurrences

Description: From Scope and Arrangement of Review: "This review is confined to the technical literature of the origin, history, and foreign occurrences of saline potassium minerals, their mining, description, treatment, and physical-chemical relations. The literature on alunite, jarosite, and related minerals has also been included. The literature on potash minerals associated with the nitrate deposits and on the silicate minerals has been omitted as well as that on analytical methods, statistics, political… more
Date: 1930
Creator: Berliner, J. F. T.
Partner: UNT Libraries Government Documents Department
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Methods and Costs of Stripping and Mining at the United Verde Open-Pit Mine, Jerome, Arizona

Description: Report issued by the U.S. Bureau of Mines discussing the mining practices and expenses of the United Verde open-pit mine west of Jerome, Arizona. As stated in the introduction, "the purpose of this paper is to present the methods used in developing and operating the mine, and to discuss the problems encountered" (p. 1). This report includes tables, maps, and illustrations.
Date: February 1930
Creator: Alenius, E. M. J.
Partner: UNT Libraries Government Documents Department
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Experimental Investigation of Aircraft Propellers Exposed to Oblique Air Currents

Description: "Two screw propellers, a normal airplane propeller with a pitch/diameter ratio H/D = 0.5 and a helicopter propeller H/D = 0.2 were tested in the large wind tunnel of the Gottigen Aerodynamic Institute. With both propellers the angle between the propeller axis and the direction of the wind was varied from 0 to 90 degrees. In addition to the three force and the three moment components in a wind-fast coordinate system, the corresponding components in a propeller-fast coordinate system, a total of … more
Date: April 1930
Creator: Flachsbart, O. & Kröber, G.
Partner: UNT Libraries Government Documents Department
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Improving the Performance of Multi-Engined Airplanes by Means of Idling Propellers: The "Free-Wheel" Propeller

Description: In order to demonstrate the importance of free-wheeling propellers, this report considers the braking effect of a propeller on a stopped engine when the propeller is rigidly connected with the engine shaft and also when mounted on a free-wheel hub. The cases of propellers of asymmetric and symmetric section are discussed. The author describes the mechanism of the free-wheel propeller as constructed for this test. The results obtained with the device mounted on a 1,000 horsepower two-engine airp… more
Date: April 1930
Creator: Pillard, M.
Partner: UNT Libraries Government Documents Department
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Ratier Metal Propeller With Pitch Variable in Flight

Description: One of the serious sources of difficulties in variable pitch propellers is the turning moment or torque due to the centrifugal force which tends to bring the mean plane of the blades into the plane of rotation. This moment, which is found elsewhere only in propellers with removable blades, is so great that the aerodynamic forces, as regards their effect on the torsion, become entirely negligible in comparison with it. This report presents the Ratier Company's solution to changing the pitch of a… more
Date: April 1930
Creator: Léglise, Pierre
Partner: UNT Libraries Government Documents Department
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Measurement of Profile Drag on an Airplane in Flight by the Momentum Method: Part 2

Description: The purpose of this section is to survey the present status of scientific knowledge of the causes which produce drag, in order, if possible, to establish the relation between the individual results and the actual phenomena which demonstrate the fundamental importance of surface conditions. A discussion of the boundary layer is followed by: relations between frictional and form drag, application to profile-drag measurements, and different kinds of roughness. High-pressure wind tunnel tests are d… more
Date: March 1930
Creator: Schrenk, Martin
Partner: UNT Libraries Government Documents Department
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Measurement of Profile Drag on an Airplane in Flight by the Momentum Method: Part 1

Description: The present report contains the results thus far obtained and is intended to form the basis of further tests on using the momentum method. The method of testing is presented in detail and the photographs taken during these tests are interpreted.
Date: March 1930
Creator: Schrenk, Martin
Partner: UNT Libraries Government Documents Department
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Identification of Aircraft Tubing by Rockwell Test

Description: Seamless steel tubing is today the principal material of construction for aircraft. The commercial grade of tubing containing about 0.10 to 0.20% carbon at first used is being superseded by two grades which are approved by the army and navy, and which are also becoming standard for commercial airplanes.
Date: June 1930
Creator: Knerr, Horace
Partner: UNT Libraries Government Documents Department
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Riveting in Metal Airplane Construction Part 4: Strength of Riveted Joints in Duralumin (Concluded), Comparative Tests With Riveted Joints

Description: Tests were made to determine the crushing strength of a riveted joint, in order to define the difference in crushing stregth between a strictly bolted joint and a riveted joint. The object was to tabulate the crushing strength by failure on various plate thicknesses for a one-rivet double-shear riveted joint.
Date: December 1930
Creator: Pleines, Wilhelm
Partner: UNT Libraries Government Documents Department
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Riveting in Metal Airplane Construction Part 3: Strength of Riveted Joints in Duralumin (Continued), Test Installation and Arrangement

Description: This report includes strength of riveted joints in duralumin, descriptions of test procedure and results of tests. Tabulated data includes: curshing strength by failure for various conditions, shearing strength of hole edge zone in direction of tearing, tearing strengths of plates weakened by rivet holes, and enlargement of holes at beginning of break.
Date: December 1930
Creator: Pleines, Wilhelm
Partner: UNT Libraries Government Documents Department
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Riveting in Metal Airplane Construction Part 2: Riveting Methods and Equipment (Concluded), Strength of Riveted Joints in Duralumin

Description: This report includes descriptive material on rivet inspection, types of rivets and sizes. Tabular data on shearing strength of rivets at failure, ultimate shear of various rivets, tensile tests of rivet plate, and tensile strength values of riveted joints are provided.
Date: December 1930
Creator: Pleines, Wilhelm
Partner: UNT Libraries Government Documents Department
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