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  Partner: UNT Libraries Government Documents Department
 Decade: 1940-1949
 Year: 1940
World news of the week, Monday, Dec. 30, 1940, volume 3, no. 17.

World news of the week, Monday, Dec. 30, 1940, volume 3, no. 17.

Date: December 30, 1940
Creator: unknown
Description: Illustrated color map with textual news highlights for the week of December 20 to December 26, 1940.
Contributing Partner: UNT Libraries Government Documents Department
An Approximate Method of Calculation of Relative Humidity Required to Prevent Frosting on Inside of Aircraft Pressure Cabin Windows, Special Report

An Approximate Method of Calculation of Relative Humidity Required to Prevent Frosting on Inside of Aircraft Pressure Cabin Windows, Special Report

Date: December 5, 1940
Creator: Jones, Alun R.
Description: This report has been prepare in response to a request for information from an aircraft company. A typical example was selected for the presentation of an approximate method of calculation of the relative humidity required to prevent frosting on the inside of a plastic window in a pressure type cabin on a high speed airplane. The results of the study are reviewed.
Contributing Partner: UNT Libraries Government Documents Department
Chordwise load distribution of a simple rectangular wing

Chordwise load distribution of a simple rectangular wing

Date: December 1, 1940
Creator: Wieghardt, Karl
Description: The chordwise distribution theory was taken over from the theory of the infinite wing. Since in this work a series expansion in b/t was used, the computation converges only for large aspect ratios. In this paper a useful approximate solution will be found also for wings with large chord - i.e., small aspect ratio.
Contributing Partner: UNT Libraries Government Documents Department
Cyclic stress-strain studies of metals in torsion

Cyclic stress-strain studies of metals in torsion

Date: December 1, 1940
Creator: Paul, D A & Moore, R L
Description: None
Contributing Partner: UNT Libraries Government Documents Department
The design of cooling ducts with special reference to the boundary layer at the inlet

The design of cooling ducts with special reference to the boundary layer at the inlet

Date: December 1, 1940
Creator: Katzoff, S
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Drag and propulsive characteristics of air-cooled engine-nacelle installations for two-engine airplanes

Drag and propulsive characteristics of air-cooled engine-nacelle installations for two-engine airplanes

Date: December 1, 1940
Creator: Lehr, Robert R
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Drag determination of the forward component of a tricycle landing gear

Drag determination of the forward component of a tricycle landing gear

Date: December 1, 1940
Creator: Harmon, Hubert N
Description: Wind-tunnel tests were performed to determine the drag of the front-wheel arrangements of several types of tricycle landing gear. One wheel was tested in arrangements to simulate both nonretracted and partially retracted types. The landing gears were tested in conjunction with a fuselage, and the effects of wheel extension and longitudinal location were determined. The drag changed very little with either longitudinal location or wheel extension for the landing gear with the lowest drag; a completely faired landing gear of the wheelspan, single-strut type. The drag of the trouser-type landing gear increased considerably, however, with an increase in the wheel extension. The wheel of the unaired retractable landing gear was at least one-half retracted into the fuselage before the drag became less than that of the best nonretracted landing gear. The drag per unit frontal area of the landing gears of the present tests was about the same as that found for similar landing gears in earlier tests.
Contributing Partner: UNT Libraries Government Documents Department
Extension of pack method for compressive tests

Extension of pack method for compressive tests

Date: December 1, 1940
Creator: Aitchison, C S
Description: The pack method for determining compressive stress-strain graphs described in NACA Report No. 649 has been modified to extend it's application to thinner gages and stronger materials. The principal modifications consisted in the provision of additional support against instability cementing the specimens of the pack together with fused shellac and the provision of special clamps to hold the specimens together while the test is in progress. The shellac was found to increase the buckling load of the pack without any appreciable effect on the compressive stress-strain graph of the material. The extended pack method described in this note has made possible the application of stresses in excess of 220 kips per square inch to sheet material having a thickness of only 0.02 inch.
Contributing Partner: UNT Libraries Government Documents Department
Factors affecting heat transfer in the internal-combustion engine

Factors affecting heat transfer in the internal-combustion engine

Date: December 1, 1940
Creator: Ku, P M
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Flow around wings accompanied by separation of vortices

Flow around wings accompanied by separation of vortices

Date: December 1, 1940
Creator: Schmieden, C
Description: The flow around wings computed by the usual method leads in the case of a finite trailing edge to a stagnation point in the trailing edge due to the Kutta-Joukowsky condition of flow governing this region. As a result, the theoretical pressure distribution differs substantially from the experimental values in the vicinity of the trailing edge. The present report describes an alternative method of calculation in which the rear stagnation point no longer appears. The stream leaves the trailing edge tangentially on the pressure side and a similar tangential separation occurs on the suction side of the profile at a point slightly in front of the trailing edge.
Contributing Partner: UNT Libraries Government Documents Department
Frost and the prevention of frost damage.

Frost and the prevention of frost damage.

Date: December 1940
Creator: Young, Floyd D. (Floyd Dillon), 1890-
Description: Describes how frost forms and what can be done to protect farm equipment and plants during a frost.
Contributing Partner: UNT Libraries Government Documents Department
The horn fly and its control.

The horn fly and its control.

Date: December 1940
Creator: Bruce, W. G. (Wesley Gordon), b. 1892.
Description: Describes the life cycle and of the horn fly, the damage it causes to livestock, and steps for controlling it.
Contributing Partner: UNT Libraries Government Documents Department
Materials for slack diaphragms

Materials for slack diaphragms

Date: December 1, 1940
Creator: Puschmann, Traute
Description: This report deals with systematic experiments carried out on five diaphragm materials with different pretreatment, for the purpose of ascertaining the suitability of such materials for slack diaphragms. The relationship of deflection and load, temperature and moisture, was recorded. Of the explored materials, synthetic leather, balloon cloth, goldbeaters skin, Igelit and Buna, synthetic leather treated with castor oil is the most suitable material for the small pressure range required. Balloon cloth is nearly as good, while goldbeaters skin, Igelit and Buna were found to be below the required standards.
Contributing Partner: UNT Libraries Government Documents Department
Mulching to establish vegetation on eroded areas of the Southeast.

Mulching to establish vegetation on eroded areas of the Southeast.

Date: December 1940
Creator: Franklin, Sydney.
Description: Describes how using mulch can prevent erosion and enable new plant growth on eroded farm field borders in the southeastern United States.
Contributing Partner: UNT Libraries Government Documents Department
Recent work on airfoil theory

Recent work on airfoil theory

Date: December 1, 1940
Creator: Prandtl, L
Description: The basic ideas of a new method for treating the problem of the airfoil are presented, and a review is given of the problems thus far computed for incompressible and supersonic flows. Test results are reported for the airfoil of circular plan form and the results are shown to agree well with the theory. As a supplement, a theory based on the older methods is presented for the rectangular of small aspect ratio.
Contributing Partner: UNT Libraries Government Documents Department
Rectangular shell plating under uniformly distributed hydrostatic pressure

Rectangular shell plating under uniformly distributed hydrostatic pressure

Date: December 1, 1940
Creator: Neubert, M & Sommer, A
Description: A check of the calculation methods used by Foppl and Henky for investigating the reliability of shell plating under hydrostatic pressure has proved that the formulas yield practical results within the elastic range of the material. Foppl's approximate calculation leaves one on the safe side. It further was found on the basis of the marked ductility of the shell plating under tensile stress that the strength is from 50 to 100 percent higher in the elastic range than expected by either method.
Contributing Partner: UNT Libraries Government Documents Department
Lathes

Lathes

Date: November 29, 1940
Creator: United States. Army. Air Corps
Description: A guide to the operation and maintenance of lathes for general shop work.
Contributing Partner: UNT Libraries Government Documents Department
Railway shop battalion.

Railway shop battalion.

Date: November 29, 1940
Creator: United States. War Department. Office of the Chief of Engineers.
Description: "This manual explains the organization and operation of railway shop battalion for employment on a standard military railway. Its purpose is to assist railway shop battalion officers in the training and operation of their units, and to guide command and staff officers charged with the employment of railway shop battalions."
Contributing Partner: UNT Libraries Government Documents Department
Grinding machines

Grinding machines

Date: November 26, 1940
Creator: United States. Army. Air Corps
Description: This report provides the definition of grinding and discusses different processes, types, and operations of grinding.
Contributing Partner: UNT Libraries Government Documents Department
Creep strength of stabilized wrought-aluminum alloys

Creep strength of stabilized wrought-aluminum alloys

Date: November 1, 1940
Creator: Muller, W
Description: Rohn-type equipment has been mounted on rubber blocks, for the purpose of damping the vibrations of the ground and of rendering the plastic yielding of the test bars less subject to outside interferences. New equipment also included three shockproof creep-testing machines with the Martens mirror instruments for recording the strain curve of the fatigue-tested specimens.
Contributing Partner: UNT Libraries Government Documents Department
The Effect of Initial Displacement of the Center Support on the Buckling of a Column Continuous Over Three Supports

The Effect of Initial Displacement of the Center Support on the Buckling of a Column Continuous Over Three Supports

Date: November 1, 1940
Creator: Kotanchik, Joseph N
Description: None
Contributing Partner: UNT Libraries Government Documents Department
The Effect of Initial Displacement of the Center Support on the Buckling of a Column Continuous over Three Supports

The Effect of Initial Displacement of the Center Support on the Buckling of a Column Continuous over Three Supports

Date: November 1, 1940
Creator: Lunquist, Eugene E. & Kotanchik, Joseph N.
Description: The test indicate that "an indiscriminate single application of the Southwell method (for analyzing Exp. Observations in problems of elastic stability)--can result in definite and measurable errors" The test also indicate "that the effect of curvature due to bending on the critical load for the compression flange material of a box beam is probably small and can be neglected." We have not found this to be true in our tests. It is believed that the effect of curvature, together with a small amount of fixity at the ribs, tends to force the stiffeners to bow in each bay thus effectively increasing their end fixity and thereby raising their allowable loads.
Contributing Partner: UNT Libraries Government Documents Department
Feeding dairy cows.

Feeding dairy cows.

Date: November 1940
Creator: Woodward, T. E. (Thompson Elwyn) & Nystrom, Amer Benjamin, 1885-
Description: Describes many types of dairy-cow feeds, their nutritive value, and their functions. Includes instructions for feed preparation and feeding recommendations for various situations.
Contributing Partner: UNT Libraries Government Documents Department
A Flight Investigation of Exhaust-Heat De-Icing

A Flight Investigation of Exhaust-Heat De-Icing

Date: November 1, 1940
Creator: Jones, Alun R & Rodert, Lewis A
Description: The National Advisory Committee for Aeronautics conducted exhaust-heat de-icing tests in flight to provide data needed in the application of this method. The capacity to extract heat from the exhaust gas for de-icing purposes, the quantity of heat required, and other factors were examined. The results indicate that a wing-heating system employing a spanwise exhaust tube within the leading edge of the wing removed 30 to 35 percent of the heat from exhaust gas entering the wing. Data are given from which the heat required for ice prevention can be calculated. Sample calculations have been made on the basis of existing engine power/wing area ratios to show that sufficient heating can be obtained for ice protection on modern transportation airplanes, provided that uniform distribution of the heat can be secured.
Contributing Partner: UNT Libraries Government Documents Department
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