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[Window display for White Swan Coffee]

Description: Photograph of a window displaying stacked of White Swan Coffee cans. The display includes five advertisements in the window. Also, there is a sign hanging above that reads "featured on WBAP and WBAP-TV."
Date: October 30, 1931
Creator: WBAP-TV (Television station : Fort Worth, Tex.)
Item Type: Refine your search to only Photograph
Partner: UNT Libraries Special Collections

[Window display for Vicks Va-tro-nol nose drop and cough syrup]

Description: Photograph of a window display with signs featuring various Vicks Va-tro-nol nose drops and Vicks Cough Syrup products. In the center, there is a display that reads "Advertised on WBAP 570 ABC and WBAP 820 NBC. Star Telegram Stations" and smaller advertisements in the window.
Date: October 30, 1931
Creator: WBAP-TV (Television station : Fort Worth, Tex.)
Item Type: Refine your search to only Photograph
Partner: UNT Libraries Special Collections
open access

Lift Distribution and Longitudinal Stability of an Airplane

Description: The preliminary calculation of the airplane polar and hence of the flight performances and characteristics rests on the assumption of an elliptical lift distribution at all altitudes. For large angles of attack below C(sub a (sub max)), this method of calculation yields no satisfactory agreement with measurements made in flight. An attempt is made to eliminate the errors in the preliminary calculation by the assumption of a disturbance of the lift distribution in this angle-of-attack range, whi… more
Date: October 1931
Creator: Töpfer, Carl
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Performance of a compression-ignition engine with a precombustion chamber having high-velocity air flow

Description: Presented here are the results of performance tests made with a single-cylinder, four stroke cycle, compression-ignition engine. These tests were made on a precombustion chamber type of cylinder head designed to have air velocity and tangential air flow in both the chamber and cylinder. The performance was investigated for variable load and engine speed, type of fuel spray, valve opening pressure, injection period and, for the spherical chamber, position of the injection spray relative to the a… more
Date: October 1931
Creator: Spanogle, J. A. & Moore, C. S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

The prevention of ice formation on gasoline tank vents

Description: "This investigation was conducted in the refrigerated wind tunnel at the Langley Memorial Aeronautical Laboratory, Langley Field, Va., to determine a suitable method for preventing the formation of ice on the vents of airplane gasoline tanks. Tests were made on a variety of vent forms arranged in a number of different orientations relative to the direction of the air stream. Both the size of the tube and its orientation were found to be of great importance. Small tubes, under equal circumstance… more
Date: October 1931
Creator: Theodorsen, Theodore & Clay, William C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Penetration and Duration of Fuel Sprays From a Pump Injection System

Description: "High-speed motion pictures were taken of individual fuel sprays from a pump injection system. The changes in the spray-tip penetration with changes in the pump speed, injection-valve opening and closing pressures, discharge-orifice area, injection-tube length and diameter, and pump throttle setting were measured. In addition, the effects of the variables on the time lag and duration of injection can be controlled by the dimensions of the injection tube, the area of the discharge orifice, and t… more
Date: October 1931
Creator: Rothrock, A. M. & Marsh, E. T.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Laboratory Testing of the Inflammability of Coal and other Dusts Conducted by the Bureau of Mines

Description: From Introduction: "This paper endeavors to collect and describe all of the work in proper order, as briefly as is consistent with a good understanding thereof, and attempts to evaluate it in the light of present-day knowledge derived from large and small scale experiments in the United States and foreign countries."
Date: October 1931
Creator: Greenwald, H. P.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

On Atomization in Carburetors

Description: The outstanding quantity of the whole atomization problem is the characteristic K, and therefore the ratio of the static pressure of the air stream with respect to the liquid to the surface tension of the liquid. The higher its value, the better the atomization. The shape of the Venturi tube plays a secondary role. The increase of section beyond the throat had best not be too abrupt.
Date: October 1931
Creator: Scheubel, F. N.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Load Assumptions for the Landing Impact of Seaplanes

Description: The formula for the impact of floats must include the enlargement factor itself as well as the type of enlargement. The latter is preferably characterized by the change in surface loading. It is shown that the enlargement of a small seaplane generally results in a changed float (or boat) loading as well as wing loading. The conditions of starting stipulate the retention of the float loading when changing from single-float (boat) to twin-float arrangement. This contingency is followed by an incr… more
Date: October 1931
Creator: Taub, Josef
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Flutter in Propeller Blades

Description: This report considers two different explanations for propeller breaks caused by propeller flutter. The two possibilities are combined vibrations of the blade, similar to those of the wings, which develop by absorbing energy from the air stream and converting it into vibrations without the aid of any periodic external disturbance. The other possibility examined is forced vibrations, which are produced in every structure by periodically variable impulses. Such vibrations are especially dangerous … more
Date: October 1931
Creator: Seewald, Friedrich
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

The Elimination of Fire Hazard Due to Back Fires

Description: "A critical study was made of the operation of a type of back-fire arrester used to reduce the fire hazard of aircraft engines. A flame arrester consisting of a pack or plug of alternate flat and corrugated plates of thin metal was installed in the intake pipe of a gasoline engines; an auxiliary spark plug inserted in the intake manifold permitted the production of artificial back fires at will. It was found possible to design a plug which prevented all back fires from reaching the carburetor" … more
Date: October 13, 1931
Creator: Theodorsen, Theodore & Freeman, Ira M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

The Theory of Wind-Tunnel Wall Interference

Description: This report outlines the development of a general theory for the calculation of the effect of the boundaries of the air stream on the flow past an airfoil. Analytical treatments are given for tunnels with horizontal boundaries only, with vertical boundaries only, and with a bottom boundary only. Formulas are developed for the tunnel wall interference in each case for an airfoil located at the center of the tunnel. The correction is given as a function of the width to height ratio of the tunnel.
Date: October 9, 1931
Creator: Theodorsen, Theodore
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

The 7 by 10 Foot Wind Tunnel of the National Advisory Committee for Aeronautics

Description: This report presents a description of the 7 by 10 foot wind tunnel and associated apparatus of the National Advisory Committee for Aeronautics. Included also are calibration test results and characteristic test data of both static force tests and autorotation tests made in the tunnel.
Date: October 22, 1931
Creator: Harris, Thomas A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Pressure distribution tests on a series of Clark Y biplane cellules with special reference to stability

Description: "The pressure distribution data discussed in this report represents the results of part of an investigation conducted on the factors affecting the aerodynamic safety of airplanes. The present tests were made on semispan, circular-tipped Clark Y airfoil models mounted in the conventional manner on a separation plane. Pressure readings were made simultaneously at all test orifices at each of 20 angles of attack between -8 degrees and +90 degrees. The results of the tests on each wing arrangement … more
Date: October 15, 1931
Creator: Noyes, Richard W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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