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  Partner: UNT Libraries Government Documents Department
 Decade: 1940-1949
Here's a war job for you : railroad workers urgently needed.

Here's a war job for you : railroad workers urgently needed.

Date: [c.1944]
Creator: Treidler, Adolph, 1886-1981.
Description: Five tracks of locomotives run side by side. One of the trains is transporting army tanks.
Contributing Partner: UNT Libraries Government Documents Department
Keep your Red Cross at his side : give!

Keep your Red Cross at his side : give!

Date: [c. 1945]
Creator: Whitman.
Description: Image of a soldier in a helmet. Green foliage is seen in the background. A large Red Cross symbol appears in the lower right area of the poster.
Contributing Partner: UNT Libraries Government Documents Department
This is the enemy.

This is the enemy.

Date: [c. 1943]
Creator: Koehler, Karl. & Ancona, Victor.
Description: Stylized caricature of a scowling German soldier. There is a swastika on his cap. He wears a monocle in one eye; in the monocle is a reflection of a person hanging on a gallows.
Contributing Partner: UNT Libraries Government Documents Department
With your help China shall teach and lead her own.

With your help China shall teach and lead her own.

Date: [c. 1947]
Creator: Christy, Howard Chandler, 1873-1952.
Description: Color poster shows a painting of a Chinese woman and young boy in traditional Chinese clothing. The woman has black hair and wears a fitted green dress. The boy wears a black and red cap and a red shirt. He holds an open book.
Contributing Partner: UNT Libraries Government Documents Department
Electronics progress report, April 1--30, 1949

Electronics progress report, April 1--30, 1949

Date: December 31, 1949
Creator: Heyd, J.W. & Ohmart, P.E.
Description: Prospectus` of Band Pass Amplifiers for Proportional Counters and Instrumentation for the Study of the Electrodeposition Potential of Radioactive Elements have been submitted for review and approval. An error was found in calculations for the band pass amplifier discussed in Group 9 of the Electronics Progress Report,MLM-306, March 1--31, 1949, on the Cathode-Follower Probe. New calculations have been made and a band pass filter constructed to match the new values. Work on the cathode-follower circuit for coupling a Boron-wall tube to its linear amplifier indicated that the limit to the sharpness of a pulse which could be achieved was possibly caused by poor amplitude versus frequency response of the linear amplifier. To check this theory, modifications were made on an existing scaler which resulted in a frequency response flat up to 4.5 megacycles. Plans are being made to improve the amplitude versus frequency of the higher frequencies. The response curve shows a slightly rising characteristic at 4.5 megacycles and an attenuation at 7 megacycles. Construction of the rf generator has been resumed in an effort to deliver the finished product to Group 4 by approximately May 6, 1949. The meter circuit will measure relative rf output voltage instead of absolute ...
Contributing Partner: UNT Libraries Government Documents Department
Electronics progress report, March 1--31, 1949

Electronics progress report, March 1--31, 1949

Date: December 31, 1949
Creator: Heyd, J.W. & Ohmart, P.E.
Description: With the completion of tests of the prototype cathode-follower, it was decided to produce three more models. These have been constructed and pass the same pulse as that of the prototype. Drawings are being made of these units. By the time these units had been completed, the amplifier of the scaler was modified so that its frequency response was essentially flat up to 4.5 megacycles. Using this amplifier and the cathode-follower, a study of the pulse shapes was made and four different pulse shapes were found to be obtainable. A band pass network between the B-wall tube and the input of the cathode-follower provided a very substantial improvement over the shunt peaking network with a band pass of 1.8 to 6.5 megacycles and provided clean, uniform pulses. Plans are being made to experiment with a filter of narrower band pass, which, if satisfactory, will produce greater amplitude. When the final band pass has been determined, a combination of shunt peaking and band pass networks should provide a net gain of 30% in amplitude. The result of this research is to provide an immediate improvement in resolution loss and a possibility of realizing a still lower minimum resolving time when the ...
Contributing Partner: UNT Libraries Government Documents Department
Instrumental analysis progress report, June 1--30, 1949

Instrumental analysis progress report, June 1--30, 1949

Date: December 31, 1949
Creator: Timma, D.L.
Description: Several bismuth compounds have been submitted by E. Orban for examination by x-ray diffraction. The sample of polonium in contact with platinum mentioned in the May progress report was received and identified tentatively from its x-ray diffraction pattern as PtPo{sub 2}. Calibration of the Perkin-Elmer infrared spectrophotometer has been completed and a preliminary study of the infrared absorption of NiCO{sub 4} made. Data showing the spectral purity obtainable on three ultraviolet-visible spectrophotometers have been completed. The emission spectrum of a sample of volatile impurity from the operations process has been obtained.
Contributing Partner: UNT Libraries Government Documents Department
Production research progress report, March 1--31, 1949

Production research progress report, March 1--31, 1949

Date: December 31, 1949
Creator: Payne, J.H. Jr.
Description: A study has been made of the time and temperature required to anneal Teflon and Fluorothene. It has been found that, by proper annealing, the strains my be removed and cold-flow prevented. The disk stopcocks prepared with annealed plastics have not developed leaks on standing. A description is given of the modified slug-dissolver heating unit which has been installed in the Bismuth-II Process Line. Work has been continued on the absorption spectra of bismuth in hydrochloric acid solutions. Two methods have been described for the interpretation of absorption spectra data. The transmission curve of the Evelyn colorimeter filters have been measured on the Cary recording spectrophotometer. The resulting curves should aid in the selection of the proper filter for a given calorimetric analyses. A brief outline for the proposed method of decontaminating platinum has been presented.
Contributing Partner: UNT Libraries Government Documents Department
Ditching Investigation of a 1/18-Scale Model of the North American B-45 Airplane

Ditching Investigation of a 1/18-Scale Model of the North American B-45 Airplane

Date: December 22, 1949
Creator: Fisher, Lloyd J. & Thompson, William C.
Description: An investigation of a 1/18-scale dynamically similar model of the North American B-45 airplane was made to observe the ditching behavior and determine the proper landing technique to be used in an emergency water landing. Various conditions of damage were simulated to determine the behavior which probably would occur in a full-scale ditching. The behavior of the model was determined from high-speed motion-picture records, time-history acceleration records, and visual observations. It was concluded that the airplane should be ditched at the maximum nose-high attitude with the landing flaps full down for minimum landing speed. During the ditching, the nose-wheel and bomb-bay doors probably will be torn away and the rear of the fuselage flooded. A violent dive will very likely occur. Longitudinal decelerations of approximately 5g and vertical accelerations of approximately -6g (including gravity) will be experienced near the pilots' compartment. Ditching braces installed in the bomb bay will tend to improve the behavior slightly but will be torn away along with the bomb-bay doors. A hydroflap installed ahead of the nose-wheel doors will eliminate the dive and failure of the nose-wheel doors, and substantially reduce the motions and accelerations.
Contributing Partner: UNT Libraries Government Documents Department
Flight Test of the Aerojet 7KS-6000 T-27 Jato Rocket Motor

Flight Test of the Aerojet 7KS-6000 T-27 Jato Rocket Motor

Date: December 20, 1949
Creator: Bond, Aleck C. & Thibodaux, Joseph G., Jr.
Description: A flight test of the Aero jet Engineering Corporation's 7KS-6000 T-27 Jato rocket motor was conducted at the Langley Pilotless Aircraft Research Station at Wallops Island, Va, to determine the flight performance characteristics of the motor. The flight test imposed an absolute longitudinal acceleration of 9.8 g upon the rocket motor at 2.8 seconds after launching. The total impulse developed by the motor was 43,400 pound-seconds, and the thrusting time was 7.58 seconds. The maximum thrust was 7200 pounds and occurred at 4.8 seconds after launching. No thrust irregularities attributable to effects of the flight longitudinal acceleration were observed. Certain small thrust irregularities occurred in the flight test which appear to correspond to irregularities observed in static tests conducted elsewhere. A hypothesis regarding the origin of these small irregularities is presented.
Contributing Partner: UNT Libraries Government Documents Department
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