Revision of the Mice of the American Genus Peromyscus (open access)

Revision of the Mice of the American Genus Peromyscus

From letter of transmittal: "The work consists of a systematic study of all the members of the genus, and includes keys for the identification of the various forms, together with the necessary illustrations, and maps showing the geographic distribution of the species."
Date: April 17, 1909
Creator: Osgood, Wilfred H.
Object Type: Report
System: The UNT Digital Library
A Systematic Synopsis of the Muskrats (open access)

A Systematic Synopsis of the Muskrats

From introduction: "Systematic account of the genus Fiber through study of over 1,000 specimens, chiefly well-prepared skins, accompanied by skulls, together with many odd skulls and skeletons."
Date: April 29, 1911
Creator: Hollister, N.
Object Type: Report
System: The UNT Digital Library
Hydraulic Mine Filling: Its Use in the Pennsylvania Anthracite Fields, A Preliminary Report (open access)

Hydraulic Mine Filling: Its Use in the Pennsylvania Anthracite Fields, A Preliminary Report

Report issued by the Bureau of Mines over studies conducted on hydraulic mine filling. The different uses of this type of mine filling are discussed. This report includes tables, and illustrations.
Date: April 1913
Creator: Enzian, Charles
Object Type: Report
System: The UNT Digital Library
Methods of Preventing and Limiting Explosions in Coal Mines (open access)

Methods of Preventing and Limiting Explosions in Coal Mines

Technical paper issued by the Bureau of Mines over safety prevention in coal mines. Preventing mine explosions is emphasized. Methods used in mine safety are discussed. This paper includes tables, illustrations, and photographs.
Date: April 1915
Creator: Rice, George S. & Jones, L. M.
Object Type: Report
System: The UNT Digital Library
Revision of the American Marmots (open access)

Revision of the American Marmots

Discusses history, nomenclature, common names, habits, external characters, and specimens of American marmots. Describes, lists locations, and provides a key to species and subspecies.
Date: April 7, 1915
Creator: Howell, Arthur H.
Object Type: Report
System: The UNT Digital Library
Temperature-Viscosity Relations in the Ternary System CaO-Al₂O₃-SiO₂ (open access)

Temperature-Viscosity Relations in the Ternary System CaO-Al₂O₃-SiO₂

Technical paper issued by the Bureau of Mines over studies on the relations of temperature-viscosity. The "observations on the temperature-viscosity relations of silicates" (p. 5) are presented and discussed. This report includes tables, and illustrations.
Date: April 1918
Creator: Feild, Alexander L. & Royster, P. H.
Object Type: Report
System: The UNT Digital Library
Educational Agencies in Mining Communities (open access)

Educational Agencies in Mining Communities

Report on the importance of industrial education in the mining sector. It explains general education and facilities for specialized education for proficiency in a given field.
Date: April 1920
Creator: Read, Thomas Thornton, 1880-1947
Object Type: Report
System: The UNT Digital Library
Fire Tests of Building Columns (open access)

Fire Tests of Building Columns

Technical paper issued by the Bureau of Mines over studies conducted on fire resistance on building columns. As stated in the introduction, "the purpose of this investigation is to ascertain (1) the ultimate resistance against fire, of protected and unprotected columns as used in the interior of buildings; (2) their resistance against impact and sudden cooling from hose streams when in a highly heated condition" (p. 12). This paper includes tables, illustrations.
Date: April 21, 1921
Creator: Ingberg, S. H.; Griffin, H. K.; Robinson, W. C. & Wilson, R. E.
Object Type: Report
System: The UNT Digital Library
Recovery of Gasoline From Uncondensed Still Vapors (open access)

Recovery of Gasoline From Uncondensed Still Vapors

Report issued by the U.S. Bureau of Mines on the possibilities of increasing fuel production from crude oil. Methods of recovering oil that is lost by remaining uncondensed are presented. This report includes tables, graphs, and illustrations.
Date: April 1922
Creator: Dow, Donald B.
Object Type: Report
System: The UNT Digital Library
Measurements on the Thermal Expansion of Fused Silica (open access)

Measurements on the Thermal Expansion of Fused Silica

Scientific paper issued by the Bureau of Standards over thermal expansion of fused silica. As stated in the abstract, "this paper gives the results of an investigation on the thermal expansion of transparent and nontransparent fused silica for various temperature ranges between -125 and +1,000 degrees Celsius. A detailed description of the apparatus and the methods used in this research and a summary of available data obtained by previous observers on the thermal expansion of fused silica are given" (p. 1). This paper includes tables, photographs, and illustrations.
Date: April 13, 1926
Creator: Souder, Wilmer H. & Hidnert, Peter
Object Type: Report
System: The UNT Digital Library
The Manganese Situation from a Domestic Standpoint (open access)

The Manganese Situation from a Domestic Standpoint

From page 1: The purpose of this circular is to show the degree of dependence of the United States upon foreign sources for the manganese required by its industries.
Date: April 1927
Creator: Furness, J. W.
Object Type: Report
System: The UNT Digital Library
Safety Rules for the Installation and Maintenance of Electrical Supply and Communication Lines: Comprising Part 2 of the Fourth Edition National Electrical Safety Code (open access)

Safety Rules for the Installation and Maintenance of Electrical Supply and Communication Lines: Comprising Part 2 of the Fourth Edition National Electrical Safety Code

Report containing information regarding "the construction and maintenance of overhead and underground electrical supply and communication lines" (p. ii).
Date: April 15, 1927
Creator: United States. Bureau of Standards.
Object Type: Book
System: The UNT Digital Library
Review of State Mine Inspector's Reports as They Relate to Accidents from Falls of Roof (open access)

Review of State Mine Inspector's Reports as They Relate to Accidents from Falls of Roof

Report issued by the U.S. Bureau of Mines over state mine inspection reports from 19 U.S. states. The information in the reports includes details of accidents, locations that specific accidents occurred, and proposed remedies for prevention of future accidents. This report includes tables.
Date: April 1929
Creator: Paul, James Washington
Object Type: Report
System: The UNT Digital Library
Survey of Gravities of Domestic Crudes (open access)

Survey of Gravities of Domestic Crudes

Report on the comparative gravities of oil extracted from different regions of the United States.
Date: April 1929
Creator: Hopkins, G. R. & Coons, A. B.
Object Type: Report
System: The UNT Digital Library
Coal-Mine Fatalities in March, 1931 (open access)

Coal-Mine Fatalities in March, 1931

Report issued by the U.S. Bureau of Mines on the coal mine related deaths that occurred during the month of March, 1931. The number of fatalities and their causes are listed. This report includes tables.
Date: April 1931
Creator: Adams, William Waugh & Chenoweth, L.
Object Type: Report
System: The UNT Digital Library
Air conditions close to the ground and the effect on airplane landings (open access)

Air conditions close to the ground and the effect on airplane landings

This report presents the results of an investigation undertaken to determine the feasibility of making glide landings in gusty air. Wind velocities were measured at several stations between the ground and a height of 51 feet, and flight tests were made to determine the actual influence of gusts on an airplane gliding close to the ground.
Date: April 3, 1934
Creator: Thompson, F. L.; Peck, W. C. & Beard, A. P.
Object Type: Report
System: The UNT Digital Library
Revision of the North American Ground Squirrels: With a Classification of the North American Sciuridæ (open access)

Revision of the North American Ground Squirrels: With a Classification of the North American Sciuridæ

Summary of the geographic distribution, habits and economic relations, and descriptions of the subspecies of the North American Sciuridæ.
Date: April 1938
Creator: Howell, Arthur H.
Object Type: Report
System: The UNT Digital Library
Model Study of Plans for Channel Improvement at Dogtooth Bend, Mississippi River, Folder 1 (open access)

Model Study of Plans for Channel Improvement at Dogtooth Bend, Mississippi River, Folder 1

This memorandum, constitutes a report on the results of experiments conducted at the U. S. Waterways Experiment Station on a small scale model of that reach of the Mississippi River near and including Dogtooth Bend (Mile 32.7 above to Mile 4.0 below Cairo).
Date: April 2, 1938
Creator: Waterways Experiment Station (U.S.)
Object Type: Report
System: The UNT Digital Library
Interaction of Be with Fission Neutrons (open access)

Interaction of Be with Fission Neutrons

To determine whether or not the (n,2n) reaction in Be would produce a net increase in fission neutrons in a power plant, the distribution of In resonance neutrons slowed down from fission energies in a graphite block was measured with and without a 2" of Be in front of a U3O8 slab undergoing fission. The thermal neutrons producing the fissions were obtained by slowing down neutrons from a cyclotron source. The observed distribution without Be was well represented by a Gaussian source range 36 cm. (corresponding to an initial fission energy of 3 MeV) and a similar sink of range 7.8 cm. The total In resonance intensity with Be was 5% less than without Be. On the assumption that the effect of the Be is entirely due to its different mean free path and moderating power, the In distribution with Be was calculated. Since the m.f.p. as a function of energy is not known for Be, two separate calculations were made using the highest (2.9 cm.) and the lowest (1.80 cm.) possible values for the effective Be m.f.p. Both calculated curves were found to be higher than the observed Be distribution, indicating that at least 10% of the fission neutrons …
Date: April 29, 1942
Creator: Borst, L.; Allison, S. K.; Wheeler, John Archibald, 1911-2008 & Weinberg, Alvin Martin, 1915-2006
Object Type: Report
System: The UNT Digital Library
An Attempted Separation of Mercury Isotopes (open access)

An Attempted Separation of Mercury Isotopes

The following document describes the analysis on an attempt at separating mercury isotopes by making their environments as widely different as possible.
Date: April 30, 1942
Creator: Kauzmann, Walter, 1916-
Object Type: Report
System: The UNT Digital Library
Diesel Engines Underground: [Part] 4. Effect on Composition of Exhaust Gas of Variables Influencing Fuel Injection (open access)

Diesel Engines Underground: [Part] 4. Effect on Composition of Exhaust Gas of Variables Influencing Fuel Injection

Report issued by the Bureau of Mines over diesel engine operations. As stated in the introduction, "it is the purpose of this report to present such data and to reemphasize the importance of adequate maintenance for diesel engines used underground" (p. 2). This report includes tables, and illustrations.
Date: April 1943
Creator: Holtz, John C.; Berger, L. B.; Elliott, M. A. & Schrenk, H. H.
Object Type: Report
System: The UNT Digital Library
Report on the Coyote area district, Dolores Plateau area, Colorado (open access)

Report on the Coyote area district, Dolores Plateau area, Colorado

Report and corollary maps on the Coyote Mesa District, Dolores Plateau Area, Colorado
Date: April 1943
Creator: Wardwell, Henry Russel, 1913-
Object Type: Report
System: The UNT Digital Library
Work of the Safety Division, Fiscal Year 1942 (open access)

Work of the Safety Division, Fiscal Year 1942

Report issued by the U.S. Bureau of Mines on the investigative and educational work done by the Safety Division during 1942. Accident prevention methods and safety incentives are presented. These include first-aid and mine rescue training programs. This report includes tables, and photographs.
Date: April 1943
Creator: United States. Bureau of Mines. Safety Division.
Object Type: Report
System: The UNT Digital Library
Memorandum Listing the Areas in Colorado, Utah, Arizona and New Mexico that are Geologically Favorable for Developing Large Reserves of Vanadium Ore by Prospecting (open access)

Memorandum Listing the Areas in Colorado, Utah, Arizona and New Mexico that are Geologically Favorable for Developing Large Reserves of Vanadium Ore by Prospecting

Introduction: Vanadium ore is being mined at many places in western Colorado, southeastern Utah, northeastern Arizona, and northwestern New Mexico (fig. 1). Eight mills in this region produced about 4,300,000 pounds of V2 05 in 1942, representing about 90 percent of the vanadium obtained from domestic sources. Although ore production has mostly exceeded mill capacity since 1937, production during the last half of 1942 averaged only about 19,000 tons or ore a month, whereas the capacity of these mills total about 22,000 tons a month. At the expected rate of ore production, ore stockpiles will be exhausted sometime in 1944, and these mills will then have excess capacity. With more intensive prospecting than now practiced, however, it is believed that sufficient reserves can be indicated to sustain capacity operation of these mills for several years. This memorandum is prepared to specify those areas that are considered most favorable from a geologic standpoint for developing large reserves of vanadium ore by prospecting. It is based on intensive studies by the Geological Survey since 1939 in most of the areas that produce vanadium ore.
Date: April 10, 1943
Creator: Fischer, R. P.
Object Type: Report
System: The UNT Digital Library