Report issued by the Bureau of Mines over studies conducted on the pilot plant in Laramie County, Wyoming. As stated in the introduction, "the purpose of this report is to record information derived from recent experimental work that had as its objective the development and demonstration of one method of producing sponge iron" (p. 2). This report includes tables, illustrations, and photographs.

Report issued by the Bureau of Mines over studies conducted on the Melrose zinc-lead deposits. Methods used in the investigation are listed. The characteristics of the zinc-lead deposits are presented also. This report includes tables, maps, and illustrations.

Report issued by the Bureau of Mines over studies conducted on the Blewett zinc-lead mine of Illinois. Samples obtained through churn-drill and diamond drill holes are analyzed. This report includes tables, maps, and illustrations.

Report issued by the Bureau of Mines over studies conducted on the production processes of iron-free alum. This is the second part of the report, and focuses on the development and operation of a continuous pilot plant. This report includes tables, graphs, photographs, and illustrations.

From introduction: "The present investigation of the properties of boron stainless steel is an outgrowth of a project started in 1947. The problem is to replace the present steel used for drop rods in the Hanford piles with a material much less subject to corrosive attack from the humid atmosphere existing at the location of the rods."

This is a geological report on the uranium mine in Hack's Canyon, Mohave County, Arizona.

Report of the annual conference on weights and measures, hosted by the U.S. National Bureau of Standards in Washington D.C. It includes conference proceedings, a list of attendees, information about committees and officers, and other reports or commentaries discussed at the meetings.

Eighteen 24S-T alclad cylinders of 20-inch diameter, with skin thickness varying between 0.012 inch and 0.025 inch and length varying between 40.5 inches and 64 inches, were tested in pure bending. They were reinforced with either 16 or 28 stringers and either 5 or 6 rings. One of the purposes of the investigation was to establish the critical value above which failure would occur by general instability and below which panel instability would take place. This value was found to be between 20 and 40 for cylinders with 16 stringers and between 16 and 74 for cylinders with 28 stringers.

Note presenting an investigation of the effect of flow conditions on the geometry of the turbulent Bunsen flame. Data are presented showing the effect of Reynolds number of flow in the range of 3000 to 35,000 on flame speed for burner diameters from 1/8 to 1 1/8 inches and three fuels - acetylene, ethylene, and propane. Results regarding the geometry of the turbulent Bunsen flames, turbulent flame speeds, nature of turbulence in pipe flow, theories of turbulent flame speed, and the nature of variation of turbulent-flame speed are provided.

Report exploring the use of the Busemann third-order approximation for two-dimensional isentropic flow used in suitable conjunction with three-dimensional solutions found by the linearized theory to determine analytically, for small angles of attack and control deflections, the control-surface characteristics of partial-span constant-chord flaps on rectangular wings having finite thickness. Equations are provided for lift coefficient, rolling-moment coefficient, and hinge-moment coefficient due to control deflection, and for pitching-moment coefficient due to flap lift.

Note presenting an investigation of the weight of a simply supported transversely stiffened compression panel subjected to a given buckling load as a function of the stiffener spacing, plate thickness, and the geometry of the stiffener cross section. Results indicate that there are particular combinations of stiffener spacing and plate thickness, dependent on the geometrical properties of the stiffener cross section, for which the panel weight is a minimum.

"A matrix method of determining transmission, scattering, and absorption of radiation, such as gamma rays and neutrons, in large thickness of matter is presented. Experimental data as yet unavailable are required for complete utilization of the method. Material radioactivity whose intensity may be considered to be independent of time is also treated" (p. 1).

Report presenting an investigation of a method to analyze and to estimate performance of jet engines, which was applied to the study of the characteristics of a research turbojet engine built for the investigation. Results regarding the compressor performance, turbine performance, combustion chamber, and interaction of jet engine components are provided.

From Introduction: "The results of analytical and experimental investigations conducted at the NACA Cleveland laboratory to determine the performance of an explosion-cycle combustion chamber with a timed inlet valve and several fixed-area exhaust nozzles are presented herein. These values are compared with theoretical values obtained from an analysis of an ideal constant-volume cycle and an approximate constant-volume cycle, which is presented."

Report presenting seven uniformly dimensioned 24S-T tension panels with a central circular hole subjected to various loads in order to study the effects of plastic flow at the point of maximum stress concentration. Results regarding the elastic behavior and plastic behavior are provided.

Report presenting a source-distribution method for deriving a solution for the time-dependent surface velocity potential of thin finite wings at supersonic speeds. It is illustrated by evaluating the upwash over the tip of an arbitrary-plan-boundary wing with a supersonic and subsonic leading edge.

Report presenting two Mollier diagrams relating the thermodynamic properties of air saturated with water vapor in equilibrium with water and with ice at low temperatures. The range of the charts created includes temperatures of 400 to 540 degrees R and a pressure range of 2 to 28 pounds per square inch absolute in order to provide the greatest utility concerning icing of aircraft.

Report describing a research program to ascertain the properties of better alloys in the form of large forgings due to the impact of conditions of fabrication. Results regarding hardness surveys, short-time tensile properties, rupture test characteristics, time-deformation characteristics, creep strengths, stability characteristics, and data from tests in other laboratories are provided.

Report presenting testing to determine bearing yield and ultimate strengths for several sizes of rolled and extruded 14S sections and of rolled 24S-T and 75S-T bar. Results regarding the yield strengths, bearing failures, strength values, and ratios of bearing to tensile properties are provided.

"Low-aspect-ratio wings having triangular plan forms are treated on the assumption that the flow potentials in planes at right angles to the long axis of the airfoils are similar to the corresponding two-dimensional potentials. Pressure distributions caused by downward acceleration, pitching, rolling, sideslipping, and yawing are obtained for wings with and without dihedral. The stability derivatives calculated from these distributions are expected to apply at both subsonic and supersonic speeds, with the exception of the transonic region, up to a limiting speed at which the triangle is no longer narrow compared with the Mach cone from its vertex" (p. 1).

Report presenting an investigation to determine the effects of geometric dihedral on the low-speed static stability and yawing characteristics of an untapered 45 degree sweptback wing model of aspect ratio 2.61. Dihedral was found to have an effect on the rolling moment due to sideslip, lift-curve slope, and variation of lateral force with sideslip, but did not have an effect on the yawing moment due to sideslip.

Report describing a research program to ascertain the properties of better alloys in the form of large forgings due to the impact of conditions of fabrication. The properties of two discs of CSA alloy were tested at several temperatures. Results regarding hardness surveys, short-time tensile properties, rupture test characteristics, time-deformation characteristics, creep strengths, stability characteristics, and data from tests in other laboratories are provided.

Report presenting an investigation to determine the aerodynamic characteristics of a group of NACA 16-series airfoils related in camber and thickness over a range of Mach numbers. All of the currently available force-test data for NACA 16-series airfoils obtained under the same test conditions in the 24-inch high-speed tunnel are presented.

Report presenting the lift, drag, and pitching-moment characteristics of several unswept wings as determined by wind-tunnel testing and calculations. The aerodynamic characteristics of the wings were determined experimentally for the smooth and rough model conditions with flaps neutral and partial-span and full-span split flaps deflected 60 degrees.