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  Partner: UNT Libraries Government Documents Department
 Decade: 1930-1939
Follow me! : men 18-19, these can be yours-- apply now at any U.S. Army recruiting and induction station.

Follow me! : men 18-19, these can be yours-- apply now at any U.S. Army recruiting and induction station.

Date: [c.1939 - 1945]
Creator: unknown
Description: Black & white photograph on a yellow background. A soldier climbs a hill, his arm raised as if to wave a group onward. At right is an inset titled, "These can be yours". It shows the insignia and monthly base pay for each Army grade (rank).
Contributing Partner: UNT Libraries Government Documents Department
Her Majesty Queen Elizabeth.

Her Majesty Queen Elizabeth.

Date: [c.1937]
Creator: Wilding, Dorothy, 1893-1976.
Description: Portrait of Elizabeth Bowes-Lyon, Queen Elizabeth [later known as Queen Elizabeth the Queen Mother], Consort of King George VI of England. She wears six strands of pearls, a tiara, and an embroidered dress with three decorations attached to it. One decoration is the Family Order of King George VI, which features a portrait of the King. The decoration on her left breast is the Garter Star, which features St. George's cross.
Contributing Partner: UNT Libraries Government Documents Department
The Breda wind tunnel

The Breda wind tunnel

Date: December 1, 1939
Creator: Pittoni, Mario
Description: A description of the design and construction of the Breda wind tunnel. The tunnel is equipped with a two-meter throat diameter and a 310 kph velocity potential.
Contributing Partner: UNT Libraries Government Documents Department
Contribution to the aerodynamics of rotating-wing aircraft

Contribution to the aerodynamics of rotating-wing aircraft

Date: December 1, 1939
Creator: Sissingh, G
Description: The chief defect of the investigations up to now was the assumption of a more or less arbitrary "mean" drag coefficient for a section of the blade. This defect is remedied through replacement of the constant coefficient by a function of higher order which corresponds to the polar curve of the employed profile. In that way it is possible to extend the theory to include the entire range from "autogyro" without power input to the driven "helicopter" with forward-tilted rotor axis. The treatment includes the twisted rectangular blade and a non-twisted tapered blade. Proceeding from the air flow and stresses on a section of the blade, the formulas for torque, axial and normal thrust of a linearly twisted rectangular blade, and a non-twisted tapered blade, are derived.
Contributing Partner: UNT Libraries Government Documents Department
The Effect of Streamlining the Afterbody of an N.A.C.A. Cowling

The Effect of Streamlining the Afterbody of an N.A.C.A. Cowling

Date: December 1, 1939
Creator: Stickle, George W.; Crigler, John L. & Naiman, Irven
Description: The drag and the power cost associated with the changing of the nose of a nacelle from a streamline shape to a conventional N.A.C.A. cowling shape was investigated in the N.A.C.A. 20-foot tunnel. Full-scale propellers and nacelles were used. The increment of drag associated with the change of nose shapes was found to be critically dependent on the afterbody of the nacelle. Two streamline afterbodies were tested. The results fo the tests with the more streamlined afterbody showed that the added drag due to the open-nose cowling was only one-fourth of the drag increase obtained with the other afterbody. The results of this research indicate that the power cost, in excess of that with a streamline nose, of using an N.A.C.A. cowling in front of a well-designed afterbody to enclose a 1,500-horsepower engine in an airplane with a speed of 300 miles per hour amounts to 1.5 percent of the engine power. If the open-nose cowling is credited with 1 percent because it cools the front of the cylinders, the non-useful power cost amounts to only 0.5 percent of the engine power.
Contributing Partner: UNT Libraries Government Documents Department
The Effect of Streamlining the Aterbody of an NACA Cowling

The Effect of Streamlining the Aterbody of an NACA Cowling

Date: December 1, 1939
Creator: Naiman, Irven
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Fireproofing Christmas trees.

Fireproofing Christmas trees.

Date: December 1939
Creator: Leatherman, Martin, 1902-
Description: Describes the use of fire-resisting chemicals as a way to reduce the fire hazard of Christmas trees.
Contributing Partner: UNT Libraries Government Documents Department
Liquefied gas for the household.

Liquefied gas for the household.

Date: December 1939
Creator: Senner, Arthur H. (Arthur Henry) & Holbrook, Helen S. (Helen Shepard), b. 1882.
Description: Describes the benefits of using liquefied gas as a means of power in the home, how it is measured and distributed, and its comparative costs.
Contributing Partner: UNT Libraries Government Documents Department
Local instability of columns with I-, Z-, channel, and rectangular-tube sections

Local instability of columns with I-, Z-, channel, and rectangular-tube sections

Date: December 1, 1939
Creator: Stowell, Elbridge Z & Lundquist, Eugene E
Description: Charts are presented for the coefficients in the formulas for the critical compressive stress at which cross-sectional distortion begins in thin-wall columns of I-, Z-, channel, and rectangular-tube sections. The energy method of Timoshenko was used in the theoretical calculations required for the construction of the charts. The deflection equations were carefully selected to give good accuracy. The calculation of the critical compressive stress at stresses above the elastic range is briefly discussed in order to demonstrate the use of the formulas and the charts in engineering calculations. Two illustrative problems are included.
Contributing Partner: UNT Libraries Government Documents Department
Measurements of the air-flow velocity in the cylinder of an airplane engine

Measurements of the air-flow velocity in the cylinder of an airplane engine

Date: December 1, 1939
Creator: Wenger, Hermann
Description: The object of the present investigation is to determine the velocity in the BMW-VI cylinder of an externally driven single-cylinder test engine at high engine speeds using the hot-wire method of Ulsamer.
Contributing Partner: UNT Libraries Government Documents Department
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