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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
Recovery of uranium and plutonium from Redox off-standard aqueous waste streams

Recovery of uranium and plutonium from Redox off-standard aqueous waste streams

Date: December 31, 1949
Creator: Holm, C.H. & Matheson, A.R.
Description: In the operation of countercurrent extraction columns as in the Redox process, it is possible, and probable, that from unexpected behaviour of a column, operator error, colloid formation, etc., there will result from time to time excessive losses of uranium and plutonium in the overall process. These losses will naturally accumulate in the waste streams, particularly in the aqueous waste streams. If the loss is excessively high, and such lost material can be recovered by some additional method, then if economical and within reason, the recovered materials ran be returned to a ISF column for further processing. The objective of this work has been to develop such a method to recover uranium and plutonium from such off-standard waste streams in a form whereby the uranium send plutonium can be returned to the process line and subsequently purified and separated.
Contributing Partner: UNT Libraries Government Documents Department
Nomograms for Obtaining the Compound Composition of Hydrated Limes from the Oxide Analysis

Nomograms for Obtaining the Compound Composition of Hydrated Limes from the Oxide Analysis

Date: December 30, 1949
Creator: Levin, Ernest M.
Description: Report with two nomograms presented for rapidly obtaining the compound composition of hydrated limes from the oxide analysis. The general nomogram can be applied to any commercial hydrated lime and gives values accurate to within 0.3 percent while the special nomogram is applicable only to regularly hydrated and highly hydrated dolomitic limes and is accurate to within 0.1 percent.
Contributing Partner: UNT Libraries Government Documents Department
A PreliminaryReport on the Mechanism of the Decomposition ofDiacetyl Peroxide in Acetic Acid

A PreliminaryReport on the Mechanism of the Decomposition ofDiacetyl Peroxide in Acetic Acid

Date: December 29, 1949
Creator: Fry, A.J.; Tolbert, B.M. & Calvin, Melvin
Description: The decomposition of diacetyl peroxide in acetic acid-2-C{sup 14} has been studied, The activity of the products in general confirmed the mechanism of the reaction as proposed by Kharasch and Gladstone, The presence and distribution of activity in the methyl acetate produced in this reaction is not explained by the previously proposed mechanism. There was no appreciable exchange of acetic acid and diacetyl peroxide under the conditions of the reaction. Essentially no exchange of methyl acetate and acetic acid was observed when those reagents mere heated at 100 for five hours.
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
A free-flight technique for measuring damping in roll by use of rocket-powered models and some initial results for rectangular wings

A free-flight technique for measuring damping in roll by use of rocket-powered models and some initial results for rectangular wings

Date: December 20, 1949
Creator: Edmondson, James L & Sanders, E Claude, Jr
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Comparison of effectiveness of coordinated turns and level sideslips for correcting lateral displacement during landing approaches

Comparison of effectiveness of coordinated turns and level sideslips for correcting lateral displacement during landing approaches

Date: December 15, 1949
Creator: Faber, Stanley
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Low-speed investigation of deflectable wing-tip ailerons on an untapered 45 degrees sweptback semispan wing with and without an end plate

Low-speed investigation of deflectable wing-tip ailerons on an untapered 45 degrees sweptback semispan wing with and without an end plate

Date: December 14, 1949
Creator: Fischel, Jack & Watson, James M
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Preliminary investigation of a variable mass-flow supersonic nose inlet

Preliminary investigation of a variable mass-flow supersonic nose inlet

Date: December 13, 1949
Creator: Hayes, Clyde
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Comparative tests of the rolling effectiveness of constant-chord, full-delta, and half-delta ailerons on delta wings at transonic and supersonic speeds

Comparative tests of the rolling effectiveness of constant-chord, full-delta, and half-delta ailerons on delta wings at transonic and supersonic speeds

Date: December 12, 1949
Creator: Sandahl, Carl A & Strass, H Kurt
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Experimental investigation at supersonic speeds of side scoops employing boundary-layer suction

Experimental investigation at supersonic speeds of side scoops employing boundary-layer suction

Date: December 12, 1949
Creator: Edwards, Sherman S
Description: None
Contributing Partner: UNT Libraries Government Documents Department
The effects of scale and test technique on the validity of small-scale measurements of the aerodynamic characteristics of a wing with the leading edge swept back 63 degrees

The effects of scale and test technique on the validity of small-scale measurements of the aerodynamic characteristics of a wing with the leading edge swept back 63 degrees

Date: December 9, 1949
Creator: Rolls, L Stewart
Description: None
Contributing Partner: UNT Libraries Government Documents Department
An empirical criterion for fin stabilizing jettisonable nose sections of airplanes

An empirical criterion for fin stabilizing jettisonable nose sections of airplanes

Date: December 8, 1949
Creator: Scher, Stanley H
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Investigation of a thin wing of aspect ratio 4 in the Ames 12-foot pressure wind tunnel V : static longitudinal stability and control throughout the subsonic speed range of a semispan model of a supersonic airplane

Investigation of a thin wing of aspect ratio 4 in the Ames 12-foot pressure wind tunnel V : static longitudinal stability and control throughout the subsonic speed range of a semispan model of a supersonic airplane

Date: December 8, 1949
Creator: Johnson, Ben H , Jr & Rollins, Francis W
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Full-Scale Hydrodynamic Evaluation of a Modified Navy J4F-2 Amphibian with a 0.425-Scale XP5M-1 Hull Bottom. TED No. NACA DE325

Full-Scale Hydrodynamic Evaluation of a Modified Navy J4F-2 Amphibian with a 0.425-Scale XP5M-1 Hull Bottom. TED No. NACA DE325

Date: December 7, 1949
Creator: Land, Norman S.; Elliott, John M. & Christopher, Kenneth W.
Description: An investigation was made to evaluate the hydrodynamic qualities of a 0.425-scale model of the Navy XP5M-1 hull, which was installed on a modified Navy J4F-2 amphibian. Longitudinal and directional stability during take-off and landing, low-speed maneuverability, spray characteristics, and take-off performance were investigated. The behavior of the airplane in moderately rough water was also observed. The opinions of three pilots have been correlated with the data.
Contributing Partner: UNT Libraries Government Documents Department
Aerodynamic study of a wing-fuselage combination employing a wing swept back 63 degrees : effects at subsonic speeds of a constant-chord elevon on a wing cambered and twisted for a uniform load at a lift coefficient of 0.25

Aerodynamic study of a wing-fuselage combination employing a wing swept back 63 degrees : effects at subsonic speeds of a constant-chord elevon on a wing cambered and twisted for a uniform load at a lift coefficient of 0.25

Date: December 5, 1949
Creator: Jones, J Lloyd & Demele, Fred A
Description: None
Contributing Partner: UNT Libraries Government Documents Department
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