UNT Libraries Government Documents Department - 195 Matching Results

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An investigation of the coefficient of discharge of liquids through small round orifices

Description: "The work covered by this report was undertaken in connection with a general investigation of fuel injection engine principles as applied to engines for aircraft propulsion, the specific purpose being to obtain information on the coefficient of discharge of small round orifices suitable for use as fuel injection nozzles. Values for the coefficient were determined for the more important conditions of engine service such as discharge under pressures up to 8,000 pounds per square inch, at temperatures between 80 degrees and 180 degrees F And into air compressed to pressures up to 1,000 pounds per square inch. The results show that the coefficient ranges between 0.62 and 0.88 for the different test conditions between 1,000 and 8,000 pounds per square inch hydraulic pressure" (p. 371).
Date: 1926
Creator: Joachim, W. F.

Investigation of turbulence in wind tunnels by a study of the flow about cylinders

Description: "With the assistance and cooperation of the National Advisory Committee for Aeronautics the Bureau of Standards has been engaged for the past year in an investigation of turbulence in wind tunnels, especially in so far as turbulence affects the results of measurements in different wind tunnels. Two methods of making such studies are described in this report together with the results of the use in the 54-inch wind tunnel of the Bureau of Standards. The first method consists in measuring the drag of circular cylinders; the second in measuring the static pressure at some fixed point. Both methods show that the flow is not entirely free from irregularities" (p. 465).
Date: 1926
Creator: Dryden, H. L. & Heald, R. H.

Judging Beef Cattle

Description: Revised edition. Report discussing how buyers of beef cattle can determine the value of cattle offered in public sales. Topics discussed include parts of the carcass and classification systems used in judging cattle. Includes a suggested scorecard.
Date: 1926
Creator: Thompson, E. H.

Kirsten-Boeing propeller

Description: The advantages of the Kirsten-Boeing propeller consist essentially in the adjustability of the thrust in any desired direction, in the plane perpendicular to the axis of rotation of the system, and in its high efficiency. The propeller, which greatly resembles the paddle wheels used on river steamers, differs fundamentally from the latter, in that all the blades work simultaneously in the fluid medium (air or water).
Date: February 1, 1926
Creator: Sachse, H

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.

Laying Out Fields for Tractor Plowing

Description: Revised edition. "Tractor plowing usually requires methods of laying out the land different from those followed when plowing with horses and an ordinary plow. Farmers plowing with a tractor for the first time are often at a loss for the most satisfactory methods of laying out their fields.... This bulletin embodies the descriptions of methods found best suited to their conditions and recommended by a majority of several hundred tractor owners who have reported their methods and experiences. Among these will be found methods of laying out land suited to nearly every farm in this country and to fields of different shapes." -- p. ii
Date: 1926
Creator: Kinsman, C. D. (Claude Dennison), b. 1889 & Reynoldson, L. A. (Le Roy August), b. 1886

Making Woodlands Profitable in the Southern States

Description: Revised Edition. Report discussing farm forestry in the southern United States, which "concerns the farmer chiefly as a matter of dollars and cents. Farm forestry may be said to be the handling of forest trees and woodlands in such a manner as to increase the income and the permanent value of the farm." -- p. 1. Topics discussed include marketing timber, protecting woodlands, and making empty spaces profitable.
Date: 1926
Creator: Mattoon, Wilbur R. (Wilbur Reed), 1875-1941

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.

Measurements on the Thermal Expansion of Fused Silica

Description: 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

Metal airplane construction

Description: It has long been thought that metal construction of airplanes would involve an increase in weight as compared with wood construction. Recent experience has shown that such is not the case. This report describes the materials used, treatment of, and characteristics of metal airplane construction.
Date: May 1, 1926