Report issued by the U.S. Bureau of Mines on the motor fuel sold in the U. S. during the winter of 1949-1950. Properties and trend characteristics of the fuel sold are presented. This report includes tables, graphs, and a map.

Report issued by the U.S. Bureau of Mines on the importance and instructions for preparing thin sections of rock for microscopic examination. Proper instructions and methods for preparation of thin sections are presented. The report includes photographs.

From introduction: "This report presents the apparent viscosities of supernate-sludge slurries prepared synthetically to simulate the conditions known to exist in the waste storage tanks, but with fission products and plutonium absent."

Abstract: "Additional work on the flotation of sulphides from high-sulphur pitchblende is described. Data needed for the selection of flotation equipment are presented."

From statement of objectives: The purposes of the work described in this report are to provide data useful for designing and operating the dissolver solution clarification equipment to be installed in the Redox production plant.

Technical report outlining the theoretical study of the sub-critical BNL (Brookhaven National Laboratory) reactor, and a comparison of reactor performance with the purpose of presenting the experimental results of the experimental methods. Presents experimental results and and a detailed discussion of the experimental methods along with theoretical analysis and evaluation of the results.

This report discusses the settling rates and properties of 101-U sludge when slurried with increasing amounts of synthetic supernatant.

Report presenting the variations of pressure distributions and coefficients of wave drag with fineness ratio, Mach number, and area ratio as calculated from linearized theory for a variety of open-nose bodies of revolution at zero angle of attack. Pressure distributions and values of wave-drag coefficients are given for several bodies with curved and straight lips and for design and off-design conditions including the effects of additive drag.

"The use of Stokes' stream function for axially symmetric problems in linearized supersonic flow is discussed. The computation of streamlines away from the body is shown to be facilitated by solving the stream-function problem rather than the potential problem. Use is made of the stream function throughout this report" (p. 1).

Report presenting a performance investigation of an optical torquemeter, which has an indicating system that requires no physical connection to the torsion shaft. Dynamic tests of the torquemeter were made over a range of shaft speeds and torque loads. Results regarding the torsion-shaft static calibration, dynamic operation, and practicability of the instrument are provided.

Report presenting an experimental and analytical investigation to determine the effect of humidity on turbojet-engine performance. The humidity effect was found to be very small with the magnitude depending on the basis of comparison. Results regarding the calculated humidity correction factors, experimental effect of humidity of engine performance, and variation of saturation specific humidity with altitude are provided.

Note presenting the lateral force and yawing moment due to combined angle of attack and rolling, which have been evaluated for families of thin sweptback tapered wings with streamwise tips. Equations were derived for wings that are contained between the Mach cones springing from the wing apex and from the trailing edge of the root section, which are wings with subsonic leading edges and supersonic trailing edges. Some calculations, based on these equations, are included for groups of wings with subsonic trailing edges.

Report presenting tables and charts that give the results of an analysis accounting for variation in specific heats of a nonviscous compressible fluid during a Prandtl-Meyer flow process. The analysis results indicated that the effect of variation in specific heat on the magnitude of parameters pertinent to the flow is appreciable at high temperatures and high expansion pressure ratios.

Report presenting an investigation to study the effect of tetraethyl lead, a knock inhibitor, on isooctane. A brief study of ethyl nitrate was also carried out, which demonstrated that it decreased both the delay and critical explosion pressure. Several series of tests were carried out involving different combinations of lead and fuel-air ratio.

Report presenting a step-by-step numerical procedure based on conformal-mapping theory for the design of a cascade of airfoils with a prescribed dimensionless-velocity distribution in incompressible potential flow. It includes a set of tables to serve as a guide in computation. A comparison of several different types of airfoil design are included to examine the reliability of the procedure.

Note presenting an experimental investigation of the first stage of a two-stage turbine designed for free-vortex flow. The results of the investigation showed that highest adiabatic efficiency was attained when the turbine was operating near the design total-pressure ratio. Results regarding power and efficiency, weight rate of gas flow through the turbine, weight-flow distribution at stator-cascade outlets, stator and rotor flow angles at mean radii, radial distribution of flow angle, radial distribution of the rotor-outlet flow angle, radial distribution of the total pressures at the stator-cascade outlet, and radial distribution of rotor-outlet pressure are provided.

Report presenting a theoretical treatment of absorption problems that considers the following cases: radiation is normal to an absorber with plane parallel surfaces, radiations are of several polyenergetic types, induced radioactive isotopes decay to stable atoms in multistep decay processes, and radiations from the absorber affect the time-dependency of the source activity. Radiation from intermediate isotopes can become more dangerous than the original activity, so the entire range of radiations must be accounted for.

From Summary: "The dynamic characteristics of an axial-piston, variable-stroke, jet-engine fuel pump were experimentally determined by frequency-response tests. It was found that the pump can be approximated by a first-order linear system with an average time constant of 0.04 second. The order of magnitude of the lag of the pump is negligible compared with current jet engines. It was also established that such a pump may be used for obtaining sinusoidal fuel pressures of variable frequency and amplitude."

Report presenting an investigation of the laminar boundary layer on a flat plate in a supersonic stream by means of a Zehnder-Mach interferometer and a total-pressure probe. Results regarding the velocity and density profiles, skin friction, and recovery factor are provided.

Report presenting wind-tunnel testing to determine the temperature-recovery factors for laminar, transitional, and turbulent boundary layers on a flat plate.

Report presenting a critical comparison between experimental and theoretical results for the aerodynamic characteristics of wings at supersonic flight speeds. The lift, pitching moment, and drag characteristics of several families of wings of varying plan form and section in the wind tunnel and compared with values predicted by the three-dimensional linear theory.

Report presenting a Mollier diagram for air saturated with water vapor and charts showing thermodynamic properties of various air-water vapor and exhaust gas-water vapor mixtures as aids in calculating the thrust augmentation theoretically possible by the evaporation of water during compression. A discussion of the theoretical augmentation results is also provided.

Report presenting an investigation of the thrust augmentation of a turbojet engine resulting from the evaporation of water prior to mechanical compression over a range of flight Mach numbers, altitudes, ambient temperatures, and ambient relative humidities. The amount of thrust augmentation possible from compressor-inlet-air saturation increased with an increase in flight Mach number and decreased as the altitude was increased. Results regarding the psychrometric chart, generalized performance analysis, and augmentation calculations are provided.

Report presenting an approximation process that can be used to determine both composition and temperature resulting from a chemical reaction. It is suitable for use with any set of reactants over the complete range of mixture ratios as long as the products of reaction are ideal gases.