UNT Libraries Government Documents Department - 604 Matching Results

Search Results

Adaptor for measuring principal strains with Tuckerman strain gage

Description: Report discussing an adapter which uses three Tuckerman optical strain gages to measure the displacement of the three vortices of an equilateral triangle along lines 120 degrees apart. These displacements are substituted in well-known equations in order to compute the magnitude and direction of the principal strains. Tests of the adaptor indicate that principal strains over a gage length of 1.42 inch may be measured with a systematic error not exceeding 4 percent and a mean observational error of the order of + or minus 0.000006. The maximum observed error in strain was of the order of 0.00006. The directions of principal strains for unidirectional stress were measured with the adaptor with an average error of the order of 1 degree.
Date: June 1943
Creator: Mcpherson, A E

Aerodynamic and hydrodynamic tests of a family of models of flying hulls derived from a streamline body -- NACA model 84 series

Description: Report discussing a series of related forms of flying-boat hulls representing various degrees of compromise between aerodynamic and hydrodynamic requirements was tested in Langley Tank No. 1 and in the Langley 8-foot high-speed tunnel. The purpose of the investigation was to provide information regarding the penalties in water performance resulting from further aerodynamic refinement and, as a corollary, to provide information regarding the penalties in range or payload resulting from the retention of certain desirable hydrodynamic characteristics. The information should form a basis for over-all improvements in hull form.
Date: 1943?
Creator: Parkinson, John B; Olson, Roland E; Draley, Eugene C & Luoma, Arvo A

Aircraft insignia.

Description: Twenty different types of airplanes fly across the scene, each with distinct markings. The main background is of clouds in the sky. The border is comprised of insignia of aircraft from 47 countries.
Date: 1943
Creator: Coggins, Jack

Airplane inspection guide.

Description: "The purpose of this manual is to furnish to mechanics, inspectors, and other personnel, ..., the necessary information relative to the inspection of airplanes, airplane engines, and auxiliary equipment."
Date: August 17, 1943
Creator: United States. War Department.

Altitude rating of electrical apparatus

Description: From Introduction: "This paper studies the effect of altitude on the ratings of rotating electric machines and after determining the fundamental principles involved, discusses these in relation to the application of such machines in modern aircraft."
Date: January 1943
Creator: Lebenbaum, Paul, Jr

American Junior Red Cross.

Description: A color illustration of a neatly dressed young man and woman. The young man holds a raised Red Cross flag in one hand; his other hand is raised and index finger extended. The young woman wears a yellow dress and carries a Red Cross box, a wooden board-game box, and a child's dress in her arms. A town is seen in the background.
Date: 1943
Creator: Humphrey, Walter Beach, 1892-1966.

Americans suffer when careless talk kills!

Description: Color illustration of an older man in overalls, with his arm around a weeping older woman in a simple dress and apron. The woman holds a "Western Union" telegram and wipes her tears with her apron skirt. On the wall behind them hangs a service flag with a blue star centered on a white background, with a red border. (A blue star signifies a family member who is alive and serving in the war.)
Date: 1943
Creator: Anderson, Harry Martin

The analysis of strains indicated by multiple-strand resistance-type wire strain gages used as rosettes

Description: From Summary: "Methods are given for making the necessary corrections to the strains indicated by multiple-strand resistance-type wire strain gages used singly or as rosettes to measure strains at an angle to the principal strain. The results of tests to determine the validity of the methods of correction are reported."
Date: January 1, 1943
Creator: Dow, Norris F

Analysis of wind-tunnel stability and control tests in terms of flying qualities of full-scale airplanes

Description: From Introduction: "The purpose of this paper is to outline a suggested form of presentation of the results of a stability and control investigation in terms of flying qualities as defined in reference 1 and to systematize and review briefly the analytical work required for this type of presentation. No effort is made to specify definite test procedures."
Date: April 1, 1943
Creator: Kayten, Gerald G

Annual Report of Research and Technologic Work on Coal: Fiscal Year 1942

Description: Report issued by the U.S. Bureau of Mines discussing studies over the research and technology of coal during 1942. As stated in the introduction, "the annual reports of the research and technologic investigations conducted by the Bureau of Mines on the occurrence, properties, mining, preparation, and uses of coal, of which the present report is the seventh, are intended to be brief summaries of progress" (p. 4). This report includes tables, illustrations, and photographs.
Date: May 1943
Creator: Fieldner, Arno Carl & Rice, W. E.