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  Partner: UNT Libraries Government Documents Department
 Decade: 1940-1949
 Year: 1941
Chemical Properties of Uranium Hexafluoride, UF6

Chemical Properties of Uranium Hexafluoride, UF6

Date: June 25, 1941
Creator: Grosse, Aristid V.
Description: Uranium hexafluoride has the distinction of being the only stable gaseous compound of uranium known up to the present moment. Because of this property it is the only compound that can be used for processes of isotope separation, such as diffusion, thermal diffusion, centrifuge separation, distillation, and other of a similar nature. Here is a short description of the properties of UF{sub 6} and is intended for a reader interested only casually in this compound. UF{sub 6} is a very reactive compound and a very strong fluorinating agent. It is immediately hydrolized by water. In fluorinating reactions it is reduced to the green highly stable UF{sub 4}. It reacts instantaneously with hydrogen at room temperature. It fluorinates many metals; sodium and mercury are attacked in the cold, lead, zinc, tin and iron on heating; platinum and gold react only above 400 C. With organic compounds like alcohol, ether, benzene or toluene, immediate fluorination takes place with formation of HF and carbon or carbonaceous material. The compound forms colorless, very volatile, beautiful transparent crystals of high refractive index. Melting point = 69.5{sup o}; boiling point at 760 mm = 56.2{sup o}; D20{sup o} = 4.68. The crystals melt water pressure to ...
Contributing Partner: UNT Libraries Government Documents Department
The Precipitation of Uranium Peroxide in the Presence of Fluorides

The Precipitation of Uranium Peroxide in the Presence of Fluorides

Date: January 1, 1941
Creator: King, Edward J.
Description: The large-scale recovery of uranium from materials which also contained great quantities of fluorides did not give a product which had a low enough fluoride content to be treated satisfactorily by the other extraction process. The objective of the investigations carried out in this laboratory was a method of reducing the amount of fluoride which accompanied the uranium. The material from which the uranium was recovered in the industrial process was a slag containing (in addition to uranium) magnesium fluoride, calcium and dolomitic lines, crucible dross, and other waste products from the reaction of magnesium metal and uranium hexafluoride. Most of the fluoride was removed from this mixture by heating the roasted and ground slag with sulfuric acid. The residue was mixed with water and much of the caclium sulfate and fluoride, magnesium fluoride, and hydrated ferric oxide and alumina was precipitated by reducing the acidity. After filtering off the precipitate, ammonium sulfate was added to the solution and uranium peroxide (UO{sub 4} {center_dot} 2H{sub 2}O) was precipitated by addition of hydrogen peroxide. The pH of the solution was maintained between 3.0 and 3.5 during the precipitation by addition of sodium hydroxide. The uranium peroxide, even after washing, contained between ...
Contributing Partner: UNT Libraries Government Documents Department
Spirit Leveling in Texas: Part 5. South-central Texas, 1896-1938

Spirit Leveling in Texas: Part 5. South-central Texas, 1896-1938

Date: 1941
Creator: Staack, J. G. (John George), 1878-
Description: Report discussing the figures of elevations determined by spirit leveling across particular quadrangles in Texas.
Contributing Partner: UNT Libraries Government Documents Department
Spirit Leveling in Texas: Part 3. West-central Texas, 1896-1938

Spirit Leveling in Texas: Part 3. West-central Texas, 1896-1938

Date: 1941
Creator: Staack, J. G. (John George), 1878-
Description: Report discussing the figures of elevations determined by spirit leveling across particular quadrangles in Texas.
Contributing Partner: UNT Libraries Government Documents Department
Report of the Chief of the Forest Service: 1941

Report of the Chief of the Forest Service: 1941

Date: 1941
Creator: United States. Forest Service.
Description: Annual report from the U.S. Department of Agriculture Forest Service describing activities of the organization, expenditures and receipts, and a discussion of other relevant topics for the fiscal year.
Contributing Partner: UNT Libraries Government Documents Department
Attwater's Prairie Chicken, its Life History and Management

Attwater's Prairie Chicken, its Life History and Management

Date: 1941
Creator: Lehmann, Valgene W.
Description: Summary of the Attwater's prairie chicken, including differences versus other prairie chickens, habits, habitat, limiting factors, management, and threat of extinction due to exploitation by man.
Contributing Partner: UNT Libraries Government Documents Department
Safety Rules for the Installation and Maintenance of Electric Supply and Communication Lines: Comprising Part 2 and the Grounding Rules of the Fifth Edition, National Electrical Safety Code

Safety Rules for the Installation and Maintenance of Electric Supply and Communication Lines: Comprising Part 2 and the Grounding Rules of the Fifth Edition, National Electrical Safety Code

Date: September 23, 1941
Creator: unknown
Description: A report on the safety rules for the installation and maintenance of electric supply and communication lines.
Contributing Partner: UNT Libraries Government Documents Department
Design of nozzles for the individual cylinder exhaust jet propulsion system

Design of nozzles for the individual cylinder exhaust jet propulsion system

Date: April 1, 1941
Creator: Voss, Fred
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Comparison of Vee-Type and Conventional Tail Surfaces in Combination with Fuselage and Wing in the Variable-Density Tunnel

Comparison of Vee-Type and Conventional Tail Surfaces in Combination with Fuselage and Wing in the Variable-Density Tunnel

Date: July 1, 1941
Creator: Greenberg, Harry
Description: The pitching and the yawing moments of a vee-type and a conventional type of tail surface were measured. The tests were made in the presence of a fuselage and a wing-fuselage combination in such a way as to determine the moments contributed by the tail surfaces. The results showed that the vee-type tail tested, with a dihedral angle of 35.3 deg, was about 71 percent as effective in pitch as the conventional tail and had a yawing-moment to pitching-moment ratio of 0.3. The conventional tail, the panels of which were all congruent to those of the vee-type tail, had a yawing-moment to pitching-moment ratio of 0.48. These ratios are in fair agreement with values calculated by methods shown in this and previous reports. The values of the measured moments were reduced from 15 to 25 percent of the calculated value by fuselage interference.
Contributing Partner: UNT Libraries Government Documents Department
Effects of some present-day airplane design trends on requirements for lateral stability

Effects of some present-day airplane design trends on requirements for lateral stability

Date: June 1, 1941
Creator: Bamber, Millard J
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Methods of analyzing wind-tunnel data for dynamic flight conditions

Methods of analyzing wind-tunnel data for dynamic flight conditions

Date: October 1, 1941
Creator: Donlan, C J & Recant, I G
Description: The effects of power on the stability and the control characteristics of an airplane are discussed and methods of analysis are given for evaluating certain dynamic characteristics of the airplane that are not directly discernible from wind-tunnel tests alone. Data are presented to show how the characteristics of a model tested in a wind tunnel are affected by power. The response of an airplane to a rolling and a yawing disturbance is discussed, particularly in regard to changes in wing dihedral and fin area. Solutions of the lateral equations of motion are given in a form suitable for direct computations. An approximate formula is developed that permits the rapid estimation of the accelerations produced during pull-up maneuvers involving abrupt elevator deflections.
Contributing Partner: UNT Libraries Government Documents Department
Spin tests of two models of a low-wing monoplane to investigate scale effect in the model test range

Spin tests of two models of a low-wing monoplane to investigate scale effect in the model test range

Date: May 1, 1941
Creator: Donlan, Charles C
Description: None
Contributing Partner: UNT Libraries Government Documents Department
The calculation of span LCAD distributions of swept-back wings

The calculation of span LCAD distributions of swept-back wings

Date: December 1, 1941
Creator: Mutterperl, William
Description: Span load distributions of swept-back wings have been calculated. The method used was to replace the wing with a bound vortex at the quarter-chord line and to calculate the downwash due to the system of bound and trailing vortices to conform at the three-quarter-chord line to the slope of the flat-plate wing surface. Results are given for constant-chord and 5:1 tapered plan forms, for sweep-back angles of 0 degrees, 30 degrees, and 45 degrees, and for aspect ratios of 3, 6, and 9. Some comments on the stalling of swept-back wings are included.
Contributing Partner: UNT Libraries Government Documents Department
Supplement to Comparison of automatic control systems

Supplement to Comparison of automatic control systems

Date: August 1941
Creator: Oppelt, W
Description: This analysis deals with the indirect regulator, wherefrom the behavior of the direct regulator is deduced as a limiting case. The prime mover is looked upon as "independent of the load": a change in the adjusting power (to be applied) for the control link (as, for example, in relation to the adjusting path (eta) with pressure valves or the rudder of vessels) does not modify the actions of the prime mover. Mass forces and friction are discounted; "clearance" also is discounted in the transmission links of the regulator.
Contributing Partner: UNT Libraries Government Documents Department
Report of the Thirty-First National Conference on Weights and Measures, 1941

Report of the Thirty-First National Conference on Weights and Measures, 1941

Date: 1941
Creator: United States. National Bureau of Standards.
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.
Contributing Partner: UNT Libraries Government Documents Department
Report of the Thirtieth National Conference on Weights and Measures, 1940

Report of the Thirtieth National Conference on Weights and Measures, 1940

Date: 1941
Creator: United States. National Bureau of Standards.
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.
Contributing Partner: UNT Libraries Government Documents Department
Collecting and Examining Subsurface Samples of Petroleum

Collecting and Examining Subsurface Samples of Petroleum

Date: 1941
Creator: Grandone, Peter & Cook, Alton B.
Description: Report issued by the Bureau of Mines discussing subsurface samples of petroleum. As stated in the scope of report, "the Bureau of Mines has developed special equipment and procedures for obtaining samples of petroleum under pressure from the bottom of wells and for examining these samples in the laboratory" (p. 4). This report includes tables, illustrations, and a photograph.
Contributing Partner: UNT Libraries Government Documents Department
Analyses of Washington Coals: Supplement to Technical Paper 491

Analyses of Washington Coals: Supplement to Technical Paper 491

Date: 1941
Creator: Yancey, H. F. & Geer, M. R.
Description: Report issued by the Bureau of Mines discussing the technological advances made in the mining industry between 1931 and 1941. Mechanized methods for mining operations are presented. This report includes tables, illustrations, and a map.
Contributing Partner: UNT Libraries Government Documents Department
Petroleum and Natural-Gas Fields in Wyoming

Petroleum and Natural-Gas Fields in Wyoming

Date: 1941
Creator: Espach, Ralph H. & Nichols, H. Dale
Description: Report issued by the Bureau of Mines discussing 75 petroleum and natural gas fields studied throughout Wyoming. History, geographic location, geology, drilling methods, and detailed analyses are presented. This report includes tables, maps, and illustrations.
Contributing Partner: UNT Libraries Government Documents Department
Mining Practices and Safety at the Lava Cap Gold Mining Corporation Mines, Nevada City-Grass Valley District, California

Mining Practices and Safety at the Lava Cap Gold Mining Corporation Mines, Nevada City-Grass Valley District, California

Date: 1941
Creator: Ash, S. H.
Description: Report issued by the Bureau of Mines discussing mining safety in the Grass Valley mining district. As stated in the introduction, "the purpose of this paper is not to present an outstanding safety record but to show that gold mining can be pursued with the same degree of safety and improvement as any other industry, if and when the management recognizes that it can and must be done" (p. 1). This report includes tables, maps, illustrations, and photographs.
Contributing Partner: UNT Libraries Government Documents Department
Annual Report of Research and Technologic Work on Coal: Fiscal Year 1941

Annual Report of Research and Technologic Work on Coal: Fiscal Year 1941

Date: November 1941
Creator: Fieldner, Arno Carl & Schmidt, L. D.
Description: Report issued by the U.S. Bureau of Mines discussing the annual report over the research and technology of coal during 1941. As stated in the foreword, "these investigations increase our fund of exact knowledge on the properties and composition of American coals and lead to better methods in mining, preparing, storing, and utilizing coal" (p. 4). This report includes tables, illustrations, photographs, and a map.
Contributing Partner: UNT Libraries Government Documents Department
Magnetic Separation of Ores

Magnetic Separation of Ores

Date: 1941
Creator: Dean, Reginald S. & Davis, Charles Wesley
Description: Report issued by the Bureau of Mines over studies conducted on the removal of magnetic materials from iron ores. As stated in the introduction, "this report discusses briefly operations and trends in magnetic separation, explains magnetic separation, describes and classifies the machines used, and outlines their development" (p. 1). This report includes tables, and illustrations.
Contributing Partner: UNT Libraries Government Documents Department
Brucellosis of Cattle (Bang's Disease, Infectious Abortion)

Brucellosis of Cattle (Bang's Disease, Infectious Abortion)

Date: 1941
Creator: Eichhorn, A. & Crawford, A. B.
Description: This bulletin discusses the infectious disease common in cattle called brucellosis (also known as Bang's disease), which causes abortion. The causes, symptoms, and diagnosis of the disease are discussed as well as various treatments, prevention and control measures, and attempts at eradication.
Contributing Partner: UNT Libraries Government Documents Department
Bacterial Wilt of Corn

Bacterial Wilt of Corn

Date: 1941
Creator: Elliott, Charlotte
Description: This bulletin discusses bacterial wilt, which is a destructive disease of corn and is particularly destructive to sweet corn. It describes the causes and symptoms of the disease, methods of transmission, the effect of weather, and control measures.
Contributing Partner: UNT Libraries Government Documents Department
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