The following report discusses measurements for slow and fast neutrons from cadmium coated ionization chambers.

A report on the SOM-vanadium occurrences of the Huerfano Park District.

Report discussing an investigation of the flight qualities of the Bell P-39D-1 airplane. Information about the longitudinal stability and control characteristics, lateral and directional stability and control, stalling characteristics, and control friction is provided.

"Following a brief history of the NACA investigation of jet propulsion, a discussion is given of the general investigation and analysis leading to the construction of the jet-propulsion ground-test mock-up. The results of burning experiments and of test measurements designed to allow quantitative flight performance predictions of the system are presented and correlated with calculations. These calculations are then used to determine the performance of the system on the ground and in the air at various speeds and altitudes under various burning conditions. The application of the system to an experimental airplane is described and some performance predictions for this airplane are made" (p. 1).

"Panels of aluminum alloy sheets, framed by side and end stiffeners, were subjected to combined loading by means of offset knife edges applying loads to top and bottom end plates with reacting forces against the end plates supplied by laterally acting rollers. The test specimens were 17S-T aluminum alloy shoots 0.040 inch thick in panels of 10-inch width and three different lengths (approximately 10, 26, and 30 inch). Data were obtained for the bowing of transverse and longitudinal ribs of rectangular cross section and varying depths mounted on one side of the sheet only, for several ratios of compression to shear loads" (p. 1).

"An iteration method is employed to obtain the flow of a compressible fluid past a curved surface. The first approximation which leads to the Prandtl-Glauert rule, is based on the assumption that the flow differs but little from a pure translation. The iteration process then consists in improving this first approximation in order that it will apply to a flow differing from pure translatory motion to a greater degree. The method fails when the Mach number of the undisturbed stream reaches unity but permits a transition from subsonic to supersonic conditions without the appearance of a compression shock" (p. 305).

Report compiled regarding financial statements for flight activities at the Plosser-Prince Air Academy in Sweetwater, Texas. It includes explanations from the auditors and two exhibits showing the financial condition of the organization (as of July 31) and a statement of profit and loss (for October 1, 1942-July 31, 1943). The opening letter notes that flight operations at the Academy have ended as of April 3, 1943 and that the organization closing down.

Report compiled regarding financial statements for flight activities at the Plosser-Prince Air Academy in Sweetwater, Texas. It includes explanations from the auditors and two exhibits showing the financial condition of the organization (as of July 31) and a statement of profit and loss (for October 1, 1942-July 31, 1943). The opening letter notes that flight operations at the Academy have ended as of April 3, 1943 and that the organization closing down.

Report compiled regarding financial statements for flight activities at the Plosser-Prince Air Academy in Sweetwater, Texas. It includes explanations from the auditors and two exhibits showing the financial condition of the organization (as of July 31) and a statement of profit and loss (for October 1, 1942-July 31, 1943). The opening letter notes that flight operations at the Academy have ended as of April 3, 1943 and that the organization closing down.

Report compiled regarding financial statements for a component of the Plosser-Prince Air Academy in Sweetwater, Texas, documented under the name "Texas Commissary Company." It includes explanations from the auditors and two exhibits showing the financial condition of the organization (as of July 31) and a statement of profit and loss (for October 1, 1942-July 31, 1943).

Report compiled regarding financial statements for a component of the Plosser-Prince Air Academy in Sweetwater, Texas, documented under the name "Texas Commissary Company." It includes explanations from the auditors and two exhibits showing the financial condition of the organization (as of July 31) and a statement of profit and loss (for October 1, 1942-July 31, 1943).

Report compiled regarding financial statements for a component of the Plosser-Prince Air Academy in Sweetwater, Texas, documented under the name "Texas Commissary Company." It includes explanations from the auditors and two exhibits showing the financial condition of the organization (as of July 31) and a statement of profit and loss (for October 1, 1942-July 31, 1943).

Report compiled regarding financial statements for a component of the Plosser-Prince Air Academy in Sweetwater, Texas, documented under the name "Texas Commissary Company." It includes explanations from the auditors and two exhibits showing the financial condition of the organization (as of July 31) and a statement of profit and loss (for October 1, 1942-July 31, 1943).

None

Report presenting a series of related flying-boat hull forms with various combinations of aerodynamic and hydrodynamic requirements that were tested in an NACA tank and high-speed tunnel. Effects explored included varying the height of the bow, varying the height of the stern, increasing the angle of dead rise at the bow, decreasing the angle of dead rise on the afterbody, increasing the depth of step, increasing the angle of afterbody keel, adding chine flare, adding a third planing surface, and rounded chines at the bow.

Report discussing strain measurements made on a box beam of triangular cross section and on two beams of D-section under transverse bending. Information about the arrangement of the beams and experimental and calculated stresses for different boxes.

Monthly report from the Public Relations Department to the National Board of Directors for the American Women's Voluntary Services discussing their news and activities including resolutions of previous issues and reports of resignations.

Report presenting results of flight tests to determine the turning performance of a Navy F2A-3 airplane over a range of speeds for three flap deflections at two altitudes. The results are correlated with an analytical study of turning performance in which the effect of thrust on maximum lift coefficient was considered.

"A formula is given for the critical compressive stress for slightly curved sheet with equal elastic restraints against rotation along the unloaded edges. The theory of small deflections is used and the formula reduces to that given by Timoshenko for the case of simply-supported edges. For larger curvatures, a modification of Redshaw's formula to include the effect of edge restraint is suggested" (p. 1).

Report presenting testing of the effect of xylidines on the load-carrying capacity of an aircraft-engine oil in several test devices. There is also interest in the suitability of xylidines as an antiknock component in aviation gasoline, so xylidines were added to the gasoline mixes used in several different machines.

"The effect of variations in the type of mean line on the section characteristics of several representative NACA low-drag airfoils was investigated. The test results are compared with theoretical predictions and indicate trends that facilitate the choice of mean line in the absence of tests" (p. 1).

Included in this semi-monthly report written in 1943 are progress with neutron beams, neutron absorption in enriched materials, equipment operation and maintenance reports of the cyclotron neutron source facility, and instrumentation maintenance activities of individuals in the cyclotron group. (GHT)

Report presenting evidence in support of the propriety of substituting a general porpoising test of flying boat hull models in place of the usual specific test. The results of a general test are presented and compared with the results of a specific test of the same model.

"The "general Prandtl number" Pr(exp 1) - A(sub q)/A Pr, aside from the Reynolds number determines the ratio of turbulent to molecular heat transfer, and the temperature distribution in turbulent friction layers. A(sub q) = exchange coefficient for heat; A = exchange coefficient for momentum transfer. A formula is derived from the equation defining the general Prandtl number which describes the temperature as a function of the velocity" (p. 1).