This document serves to record pertinent information regarding detection and repair of a water leak in Process Tube No. 3169-F in the F File and subsequent steps necessary to remove the water from the pile in order to return to normal level.

Report on the Ouachita Facies, including map areas, geologic examinations, chemical compositions, subsurface, and findings.

The Weissinger method for determining additional span loading for incompressible flow is used to find the damping in roll, the lateral center of pressure of the rolling for wing plan forms of various aspect ratios, taper ratios, and sweep angles. In addition, the applicability of the method to the determination of certain other aerodynamic derivatives is investigated, and corrections for the first-order effects of compressibility are indicated. The agreement obtained between experimentally and theoretically determined values for the aerodynamic coefficients indicates that the method of Weissinger is well suited to the calculation of such resulting aerodynamic derivatives of wings as do not involve considerations of tip suction.

Report issued by the Bureau of Mines on motor fuels sold during the summer of 1948. The properties of the fuel samples are presented. This report includes tables, graphs, and a map.

This document presents details about health concerns resulting from the activities of the Mound Laboratory during the month of August 1948.

This is a progress report from the Brookhaven National Laboratory during the period July 1-December 31, 1948.

A long term study on the possible effect of time on the micro-assay purity of postum product solutions is reported. It was determined that within the time periods studied (up to 102 days) time has no discernible effect on the mass purity of the postum electrodeposited from product solutions.

Experiments are progressing on the development and testing of a special Logac-L contamination shield. Further investigations are being made on the possible effect of time on the mass purity of polonium deposited from product solutions.

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The synthesis of sucrose from C{sup 14}0{sub 22} by green algae has been investigated and the intermediates separated by the method of paper chromatography. It is shown that sucrose is the first free sugar appearing during photosynthesis. It is apparently formed by condensation of the glucose-I-phosphate and a fructose phosphate. A series of radioautographs of paper chromatograms of extracts from plants which have photosynthesized for different periods of time has been prepared. The results indicate that 2-phosphoglyceric acid is the first product synthesized from C0{sub 2} during photosynthesis.

Report issued by the U.S. Bureau of Mines discussing the work completed by the Petroleum and Natural Gas Division during 1947. Petroleum engineering studies and natural gas field studies are presented. This report includes tables, illustrations, and photographs.

An investigation is being conducted to determine the feasibility of studying aileron buzz by means of the wing-flow method. Two semispan models which had an aspect ratio of 6 and a taper ratio of 2 with quarter-chord half-span mass-balanced ailerons have been used. One had an NACA 23012 airfoil section and the second, an NACA 65-212 airfoil section. The ailerons on both models were subject to buzz over a small range of Mach number near 0.9. Data obtained by wing-flow testing agreed reasonably well with full-scale flight results.

The following memorandum outlines the procedures used on the neutralization of HNO3 in redox ICU and IAW streams, and the factors influencing their choice. The procedures involve a) hexone removal by evaporation in the presence of a retardant, b) destruction of the retardant, c) nitric acid elimination by boiling with aluminum and d) concentration of the remaining solution by evaporation.

This document details the activities of the Health Division of the Mound Laboratory during the month of December 1948.

Preliminary study of the characteristics of a now design of a tub type moderator for neutron counting reveals some definite advantages over the laboratory Hanson setup. Two determinations of the purity of postum were made with the vacuum balance apparatus. The first result was 94.81 percent postum and the second 100.5 percent. A redesigned effusion apparatus is described in detail, and results of nine exposures are presented. The data lie fairly close to a straight line on a log p vs 1/T plat, but the line lies much lower and differs in slope from that representing earlier data. A quartz sickle gauge apparatus with a small internal volume is being constructed to be used to measure the vapor pressure of postum. The coefficient of expansion of the low temperature form of postum has been measured in the temperature range of {minus}76{degree}C to 24{degree}C and a preliminary value of 22.0 {plus_minus} 1.5 {times} 10{sup {minus}6} per {degree}C has been obtained.

The quarts gauge apparatus for measuring the vapor pressure of postum was completed. The first sample of postum oxidized in the course of preparation, while in a presumably sealed and evacuated quartz tube. an error of 0.4 per cent appears to be present in the vacuum weighing of postum. a diffusion pump is being installed to reduce the pressure, in the hope of minimizing the radiometer effect. Repetition of the effusion experiment with a rebuilt crucible yielded four points below those reported last time by a factor of ten in pressure. A leak appeared in the crucible, requiring construction of a new one. X-ray patterns were again obtained for the Q metal sample, {number_sign}33, and oxide sample, {number_sign}42. Work on the calibration of the two new powder cameras is proceeding satisfactorily. Two samples of cadmium were made for the purpose of developing a technique for producing single crystals of metals. A sample of tellurium nitrate yielded the same pattern as that reported in the literature. Data on the characteristics of a newly designed tub type moderator as compared with the Hanson cylinder are presented. Some notes on the calculation of probable error show the minimum error to depend upon the …

"A method is presented for calculating the aerodynamic loading, the divergence speed, and certain stability derivatives of wings and tail surfaces of arbitrary plan form and stiffness. Provision is made for using either stiffness curves and root-rotation constants or influence coefficients in the analysis. Computing forms, tables of numerical constants required in the analysis, and an illustrative example are included to facilitate calculations by means of the method" (p. 1).

A method is presented for calculating the aerodynamic loading, the divergence speed, and certain stability derivatives of swept and unswept wings and tail surfaces of arbitrary stiffness. Provision is made for using either stiffness curves and root rotation constants or structural influence coefficients in the analysis. Computing forms, tables of numerical constants required in the analysis, and an illustrative example are included to facilitate calculations by means of the method.

Report presenting the results of a wind-tunnel investigation of the low-speed aerodynamic characteristics of two semispan horizontal tails with unswept and 35 degree sweptback plan forms. Test results are provided for models with and without standard roughness on their leading edges and with sealed and unsealed radius-nose elevators. Results regarding effectiveness and hinge-moment parameters, static longitudinal stability, effect of standard roughness, and effect of removing the elevator nose seal are provided.

Memorandum presenting the results of a wind-tunnel investigation of the low-speed aerodynamic characteristics of a horizontal-tail model of aspect ratio 2 with an unswept plan form and of a two-dimensional model. The two-dimensional model provides data which can be used as the basis for computing the three-dimensional lift and hinge-moment parameters by the lifting-surface-theory procedure. Results regarding the effectiveness and hinge-moment parameters, static longitudinal stability, scale effect, effect of standard roughness, and effect of removing the elevator nose seal are provided.

"The errors involved in using the perfect-gas law pv = RT and the assumption of constant heat capacities are evaluated. The basic equations of gas flows taking into account these phenomena separately and at the same time are presented" (p. 1).

"With the assumptions that Berthelot's equation of state accounts for molecular size and intermolecular force effects, and that changes in the vibrational heat capacities are given by a Planck term, expressions are developed for analyzing one-dimensional flows of a diatomic gas. The special cases of flow through normal and oblique shocks in free air at sea level are investigated. It is found that up to a Mach number 10 pressure ratio across a normal shock differs by less than 6 percent from its ideal gas value; whereas at Mach numbers above 4 the temperature rise is considerable below and hence the density rise is well above that predicted assuming ideal gas behavior" (p. 239).

Sixty-eight samples were assayed. The 5 calorimeters of type 30 were finished. Calorimeter 36, whose construction has been started, is an improved version of 30. A system of switches has been devised. A simple, fast, insensitive calorimeter for measuring high activity samples is being tested. The calculations on the half-life of postum were checked.

This letter discusses the construction of Neuts (neutron detectors) and provides operating instructions for these instruments.