This technical progress report details 100 Area activities for the time period of May 14 through May 20, 1946.

The problems of static and dynamic longitudinal stability both at high speeds and at low speeds are discussed and data are presented which indicate recent progress made in the solution of these problems.

Report presenting an investigation of the problems of static and dynamic longitudinal stability both at high speeds and low speeds as well as information about progress that has been made to solve these problems. The incorporation of large amounts of sweepback on both the wing and horizontal tail can improve the rate of trim changes and stability. Longitudinal stability has been attained for configurations with a sweep angle of 45 degrees with stall-control devices, but experimental proof is needed for these devices.

This quarterly progress report describes four programs namely (1) The Metabolic Properties of Plutonium and Allied Materials (2) Biological studies of radiation effects, (3) Biological effects of radiation from external and internal sources, and (4) Health Physics and Chemistry. Progress for each program has been separately indexed and abstracted for the database.

Front: Text describes action on various war fronts: Attu, Wake Island, Southwest Pacific, Russia, China-Burma, Air offensive. Large world map is keyed to text and shows United Nations Axis and Axis occupied areas, countries with Axis relations broken, and neutral countries. Additional maps: Mediterranean Sea; Areas held by Japan in the Kurile and Aleutian Islands. Inset map: Attu Island. Photographs: Mass production methods in the southwest Pacific mimic those of Detroit; Red Stars mark Soviet Air Force planes made in America; Nazis frisk Yugoslav peasants accused of guerilla activities Back: The not-so-soft underside [African victory].

Report presenting an investigation of the properties of hydrazine, stability and corrosiveness with a number of construction materials, sensitivity to detonation and temperature, and spontaneous reaction with the oxidants, concentrated hydrogen peroxide, sodium permanganate solution, fuming nitric acid, and tetranitromethane. Results regarding corrosion and stability, sensitivity to temperature and detonation, and theoretical calculations are provided.

An investigation is being conducted to determine the altitude performance characteristics of the British Nene II engine and its components. The present paper presents the preliminary results obtained using a standard jet nozzle. The test results presented are for conditions simulating altitudes from sea level to 60,000 feet and ram pressure ratios from 1.0 to 2.3. These ram pressure ratios correspond to flight Mach numbers between zero and 1.16 assuming a 100 percent ram recovery.

"A theoretical analysis is given for the stresses and deflections of a square plate with clamped edges under normal pressure producing large deflections. Values of the bending stress and membrane stress at the center of the plate and at the midpoint of the edge are given for center deflections up to 1.9 times the plate thickness. The shape of the deflected surface is given for low pressures and for the highest pressure considered" (p. 209).

Describes the mission, organization, and principles of employment of the field artillery unit.

Document issued by the Office of the Attorney General of Texas in Austin, Texas, providing an interpretation of Texas law. It provides the opinion of the Texas Attorney General, Price Daniel, regarding a legal question submitted for clarification: The proper method to be followed to collect delinquent taxes from an Oklahoma truck line doing business in Texas, under the intangible tax law of this State.

Document issued by the Office of the Attorney General of Texas in Austin, Texas, providing an interpretation of Texas law. It provides the opinion of the Texas Attorney General, Price Daniel, regarding a legal question submitted for clarification: The legality of a State Bank Charter amendment to change its domicile from one county to another.

Document issued by the Office of the Attorney General of Texas in Austin, Texas, providing an interpretation of Texas law. It provides the opinion of the Texas Attorney General, Price Daniel, regarding a legal question submitted for clarification: Time limitation, if any, before an election to incorporate a school district may follow an election which abolished an independent school district.

"This report presents the results of pilot observations and photographs of the compression shock wave on the wing of an airplane in flight. A detailed description of the test conditions necessary and the procedure to be following in producing the visible shock are presented. The pilot's observations of the occurrence of an oscillating shock wave and its possible relationship with the airplane buffeting are also presented" (p. 1).