Report issued by the Bureau of Mines over the Leadville Drainage Tunnel. Descriptions and details about the tunnel are presented. This report includes tables, maps, illustrations, and photographs.

Report issued by the Bureau of Mines over studies conducted on the vanadium deposits of Lincoln County, Wyoming. As stated in the introduction, "the work performed by the Bureau of Mines is explained in detail and supplemented with plans, sections, and a complete set of sample analyses. Proposed mining methods are discussed, and metallurgical tests are outlined" (p. 2). This report includes tables, maps, and illustrations.

Report issued by the Bureau of Mines over a large chromite deposit on Casper Mountain. Description of the deposit is listed. This report includes tables, maps, and illustrations.

Report issued by the Bureau of Mines on iron deposits located in Lincoln County. Properties of the iron deposits are presented. This report includes tables, maps, and illustrations.

The cyclotron is the only practical source of many carrier-free radioisotopes. The preparation and radiochemical isolation of a number of these activities, produced in the 60-inch cyclotron of Crocker Laboratory, will be presented in this paper and in subsequent papers of this series. In most cases the carrier-free radioisotopes were prepared for use in biological systems and the final preparations were in the form of isotonic saline solutions at a range of pH from 5 to 8. The present paper reports the radiochemical isolation of carrier-free Sn{sup 113} and In{sup 114} produced by bombarding cadmium with 38 Mev alpha-particles. At this energy, Sn{sup 113} and In{sup 114} are produced in a thick target by the nuclear reactions; Cd{sup 110}({alpha},n)Sn{sup 113}, Cd{sup 111}({alpha},2n)Sn{sup 113}, Cd{sup 112}({alpha},3n)Sn{sup 113}, Cd{sup 111}({alpha},p)In{sup 114}, Cd{sup 112}({alpha},pn) In{sup 114}. The shorter-lived tin and indium activities together with the possible radioisotopes of silver produced by (n,p) reactions, were allowed to decay out prior to the chemical separations.

A report which summarizes the performance data obtained from Redox solvent extraction IC Column studies made prior to January 15, 1949 in accordance with conditions of the A.N.L. June 1, 1948, Flowsheet.

Report discussing tests of a new colorimetric method. From abstract: "A colorimetric method, which is a modification of the classical phosphomolybdic acid method, has been developed for the determination of phosphate in synthetic uranium waste solutions...The chief advantage of the method, over those presently included in HW Manuals, is the rapidity with which determinations may be carried out."

A report discussing an experiment conducted to determine the effect of radiation on the melting point of Tempilaq, a commercially available, temperature-indicating liquid.

Abstract: "Small amounts of acetic acid, equivalent to 400 ul. of 0.3 to 0.13 g/L. can be titrated coulonatrically in the presence of a 10 to 25-fold excess of HN03 in 70%, isopropanol. An accuracy of +/- 0.1% and a precision of +/- 8.5% (99% limite) are obtained.

The progress report discusses activities of the P Division for the month of July, 1949. The B and F piles operated at 275 megawatts and the D pile at 305 megawatts throughout the month except for outages listed under Area Activities. A total of 57.5 tons of metal, at an average concentration of 363 megawatt days/ton (MWD/ton) was discharged from the piles during the month. This included 41.9 tons of Class V (alpha-rolled, triple-dipped, completely transformed) metal at an average concentration of 397 MWD/ton which was discharged without difficulty. A portion of this material was inspected and appears to be satisfactory for exposures at this concentration.

None

The pile physics group reports on reactivity power coefficients from the production test No. 105-248-P, the water leak in B pile, graphite properties, xenon equations from the B pile shutdown of March 1946, and reactivity balance. The experimental physics group headed by J.M. West reports on graphite testing, the P-11 project, and shielding. The experimental physics group headed by E.B. Montgomery reports on diffusion length measurements in the DR and H piles. (GHH)

The redox and pile operations are reported on. Construction in 100 (Pile), 200 (Separation), and 300 (Metal Fabrication) areas is described. General work in the Richland commercial areas and on the Southern Railroad connection is also described. Personnel information is disclosed.

The available information on the ionic and radiochemical composition of current and aged bismuth phosphate process wastes is tabulated here for the convenience of those concerned with metal recovery. In addition to its application in the design of research and development experiments, the compilation may serve to suggest specific needs for additional analytical data. For convenience in chemical calculation, molar compositions have been calculated for the ionic constituents based on the g/1 values usually reported. The dates of radiochemical analyses required for decay calculations should be available from the Analytical Sections at ORNL and HW.

On June 29th and July 13th, 1949, the Industrial Hygiene Group of the Health Instrument Divisions at HAPO conducted a study of the health aspects of the degreaser operations carried on in the Airlock adjoining the 105 Building in the 100 H Area. This was done at the request of the Medical Division. The results of the study, together with certain pertinent information concerning degreaser operation, are reported in this report.

A potential source of dangerous concentrations of hydrogen cyanide exists in the plating room of the Machine Shop where open plating baths containing cyanide salts are maintained and where solid cyanide salts are stored. Also the use of hydrogen sulfide in certain steps of the waste disposal process has lead to noticeable and sometimes objectionable concentrations of this gas in the air of the "WD" Building. In view of the toxic properties of these two gases, it was desirable to set up suitable tests to determine the actual concentrations present in the air of the respective working areas.

The general principles of a liquid-liquid solvent extraction method for the separation of metallic elements are outlined.

A high resolution scale-of-four has been developed to be used in conjunction with the nuclear particle detection devices in applications where the counting rate is unusually high. Specifically, it is intended to preceed the commercially available medium resolution scaling circuits and so decrease the resolving time of the counting system. The circuit will function reliably on continuously recurring pulses separated by less than 0.1 μ sec. It will resolve two pulses (occuring at a moderate repetition rate) which are spaced at 0.04 μ sec. A five-volt input signal is sufficient to actuate the device.

The following document presents designs and blueprints to the bubble-cap column built to replace a nitric acid concentrator.

A method of calibrating the static-pressure source of a pitot static airspeed installation on an airplane in level flight, dives, and other maneuvers at high altitude and at transonic and supersonic speeds is described. The method principally involves the use of radar-phototheodolite tracking equipment. The various sources of error in the method are discussed and sample calibrations are included.

Report presenting the boundary-layer and stalling characteristics on an NACA 64A006 airfoil section at a Reynolds number of 5,800,000. Data included measurements of lift, drag, and pitching moment, chordwise distributions of pressure, visual studies of the boundary-layer flow, and surveys of the static-pressure and velocity distribution within the boundary layer. Results regarding force and moment characteristics, pressure distributions, and boundary-layer characteristics are provided.

"A solution is presented for the problem of the buckling of curved rectangular panels subjected to combined shear and direct axial stress. Charts giving theoretical critical combinations of shear and direct axial stress are presented for panels having five different length-width ratios. Because the actual critical compressive stress of rectangular panels having substantial curvature is known to be much lower than the theoretical value, a semiempirical method of analysis of curved panels subjected to combined shear and direct axial stress is presented for use in design" (p. 1).

Report presenting six numerical examples for steady, two-dimensional, compressible, nonviscous flow in centrifugal compressors with straight blades, the center lines of which generate a right circular cone when rotated about the axis of the compressors. A seventh example is presented for incompressible flow. Correlation equations are developed whereby the flow conditions in any impeller with straight blades can be determined for all operating conditions.

Results are presented for the moments and position of force centers of a series of cambered round bodies derived from a torpedo-like body of revolution. The effects of placing fins on the rear of the body of revolution are also included.