Resource Type

Language

Examination of Zinc-Lead Mines in the Wallapai Mining District, Mohave County, Arizona (open access)

Examination of Zinc-Lead Mines in the Wallapai Mining District, Mohave County, Arizona

Report issued by the Bureau of Mines over studies on the zinc-lead mines in Mohave County, Arizona. Descriptions of the characteristics, development, and production of the ore are presented. This report includes tables, maps, and illustrations.
Date: August 1947
Creator: Haury, Peter S.
System: The UNT Digital Library
Flood-Prevention Projects at Pennsylvania Anthracite Mines: Progress Report for 1945 (open access)

Flood-Prevention Projects at Pennsylvania Anthracite Mines: Progress Report for 1945

Report issued by the Bureau of Mines over studies conducted on flood-prevention developed for mine systems. A history of flood prevention procedures as well as updated flood-prevention is presented. This report includes tables, graphs, maps, photographs, and illustrations.
Date: August 1947
Creator: Ash, S. H.; Cassap, W. E.; Westfield, James; Eaton, W. L.; Romischer, W. M.; Podgorski, E. J. et al.
System: The UNT Digital Library
National Motor-Gasoline Survey: Winter 1946-47 (open access)

National Motor-Gasoline Survey: Winter 1946-47

Report issued by the Bureau of Mines over motor-fuels sold during the winter of 1946-1947. Locations and properties of fuel samples are presented. This report includes tables and a map.
Date: August 1947
Creator: Blade, O. C.
System: The UNT Digital Library
Experiment in Underground Gasification of Coal, Gorgas, Alabama (open access)

Experiment in Underground Gasification of Coal, Gorgas, Alabama

Report issued by the Bureau of Mines over studies and experiments conducted on underground coal gasification. The results of the experiments are listed. Description and analysis of the coal and coal bed are also presented. This report includes tables, maps, photographs, and illustrations.
Date: August 1947
Creator: Dowd, James J.; Elder, James L.; Capp, J. P. & Cohen, Paul
System: The UNT Digital Library
Investigations on Reductions of Friction on Wings, in Particular by Means of Boundary Layer Suction (open access)

Investigations on Reductions of Friction on Wings, in Particular by Means of Boundary Layer Suction

Memorandum presenting investigation on reductions of friction on wings, especially by means of boundary-layer suction. The report is broken up into several sections, including: causes of transition, laminar profiles with the transition taking place, laminar boundary-layer suction, investigation of the laminar pressure increase, investigation of the slot flow for laminar boundary-layer suction with single slots, tests about keeping a boundary layer for high Reynolds laminar with the aid of boundary-layer suction, and an investigation of a slightly-cambered laminar suction profile of 10.5-percent thickness.
Date: August 1947
Creator: Pfenninger, Werner
System: The UNT Digital Library
Investigations of Free Turbulent Mixing (open access)

Investigations of Free Turbulent Mixing

Note presenting a discussion of the integral relations for flow of the boundary-layer type. It is shown that the characteristic laws of spread of jets, wakes, and so forth, can be obtained directly for the laminar case and, with the help of dimensional reasoning, for the turbulent case as well. Measurements of the mean velocity, the intensity and scale of the turbulent fluctuations, and of the turbulent shear in a two-dimensional mixing zone are presented.
Date: August 1947
Creator: Liepmann, Hans Wolfgang & Laufer, John
System: The UNT Digital Library
Quarterly Report May 1947 to August 1947 : Biology Division (open access)

Quarterly Report May 1947 to August 1947 : Biology Division

The following documents were compiled into a quarterly report that was to be published in the Radiobiology Volume of the PPR. The following reports provide data from the Biology department of the University of Chicago between May and August of 1947.
Date: August 1, 1947
Creator: Brues, Austin M.
System: The UNT Digital Library
The Heat of Solution of Uranium Tetrachloride in Aqueous Perchloric Acid Solutions (open access)

The Heat of Solution of Uranium Tetrachloride in Aqueous Perchloric Acid Solutions

Abstract: "The heat of solution of UCl4 solid has been measured and found to change appreciably with changing concentration of H+ or ionic strength. The heat of hydrolysis of U+4 to form UOH+3 is probably of the order of +11 kcal per mole" (p. 1).
Date: August 19, 1947
Creator: Fontana, B. J.
System: The UNT Digital Library
Hinge-moment characteristics of balanced elevator and rudder for a specific tail configuration on a fuselage in spinning attitudes (open access)

Hinge-moment characteristics of balanced elevator and rudder for a specific tail configuration on a fuselage in spinning attitudes

Report presenting the results of an investigation of a specific tail configuration in the 15-foot free-spinning tunnel in order to supplement the existing published data on hinge moments of elevators and rudders in spins. Hinge-moment measurements are presented for a balanced elevator equipped with trim tabs and for a balanced rudder. Results regarding elevator hinge moments, rudder hinge moments, and application of hinge-moment data are provided.
Date: August 1947
Creator: Stone, Ralph W., Jr. & Burk, Sanger M., Jr.
System: The UNT Digital Library
Some Considerations on an Airfoil in an Oscillating Stream (open access)

Some Considerations on an Airfoil in an Oscillating Stream

Report presenting information regarding the velocity potential, lift force, moment, and propulsive force on a two-dimensional airfoil in a stream of periodically varying angle of attack, as well as an application of the theoretical results.
Date: August 1947
Creator: Greenberg, J. Mayo
System: The UNT Digital Library
Flight Investigation on a Fighter-Type Airplane of Factors Which Affect the Loads and Load Distributions on the Vertical Tail Surfaces During Rudder Kicks and Fishtails (open access)

Flight Investigation on a Fighter-Type Airplane of Factors Which Affect the Loads and Load Distributions on the Vertical Tail Surfaces During Rudder Kicks and Fishtails

Note presenting results of a flight investigation conducted on a fighter-type airplane to determine the factors which affect the loads and load distributions on the vertical tail surfaces in maneuvers. An analysis is made of the data obtained in steady flight, rudder kicks, and fishtail maneuvers.
Date: August 1947
Creator: Boshar, John
System: The UNT Digital Library
A Flight Investigation of the Meteorological Conditions Conducive to the Formation of Ice on Airplanes (open access)

A Flight Investigation of the Meteorological Conditions Conducive to the Formation of Ice on Airplanes

Note presenting data from flight measurements of the meteorological factors related to the intensity of icing conditions. The physical factors that establish the distribution of liquid water in clouds of various types are discussed and the results of the analysis are used to formulate certain rules for the forecasting of icing intensity. Discussion of the results includes the problem of forecasting icing conditions and the problem of defining the physical characteristics of icing conditions for the purpose of the design of ice-protection equipment.
Date: August 1947
Creator: Lewis, William
System: The UNT Digital Library
A method for numerically calculating the area and distribution of water impingement on the leading edge of an airfoil in a cloud (open access)

A method for numerically calculating the area and distribution of water impingement on the leading edge of an airfoil in a cloud

Report presenting a method for determining, by step-by-step integration, the trajectories of water drops around any body in two-dimensional flow for which the streamline velocity components are known or can be computed. The equations are presented in general form and then water-drop trajectories are calculated about a 12-percent-thick symmetric Joukowski profile.
Date: August 1947
Creator: Bergrun, Norman R.
System: The UNT Digital Library
A comparison of flight test results on a scout-bomber airplane with 4.7 degree and with 10 degree geometric dihedral in the wing outer panels (open access)

A comparison of flight test results on a scout-bomber airplane with 4.7 degree and with 10 degree geometric dihedral in the wing outer panels

Report presenting a flight investigation of a scout-bomber airplane with 4.7 degrees and 10 degree geometric dihedral in the wing outer panels in order to obtain flight test results pertaining to the upper limit of the wing-dihedral angle for satisfactory handling qualities. No unusual or undesirable lateral control characteristics were observed with the combinations of stability parameters obtained with the two dihedral angles used.
Date: August 1947
Creator: Forsyth, Charles M. & Gray, William E., Jr.
System: The UNT Digital Library
The effect of modifications to the horizontal-tail profile on the high-speed longitudinal control of a pursuit airplane (open access)

The effect of modifications to the horizontal-tail profile on the high-speed longitudinal control of a pursuit airplane

Report presenting the results of high-speed wind-tunnel research on the effects of modifications to the horizontal tail profile on the static longitudinal stability and control of a pursuit airplane at high speeds. Two symmetrical stabilizers, two flat-sided elevators, and three elevators with bulged profiles were investigated. The pitching-moment and elevator hinge-moment characteristics with various tails are shown.
Date: August 1947
Creator: Hall, Charles F.
System: The UNT Digital Library
Instantaneous ultraviolet knock spectra correlated with high-speed photographs (open access)

Instantaneous ultraviolet knock spectra correlated with high-speed photographs

Report presenting an investigation to obtain a record of any chemical changes directly associated with knock in a spark-ignition engine on a greatly magnified time scale by means of coordinated high-speed motion pictures and spectrograms.
Date: August 1947
Creator: Hirshfeld, M. A. & Miller, Cearcy D.
System: The UNT Digital Library
Design charts for flat compression panels having longitudinal extruded Y-section stiffeners and comparison with panels having formed Z-section stiffeners (open access)

Design charts for flat compression panels having longitudinal extruded Y-section stiffeners and comparison with panels having formed Z-section stiffeners

Report presenting design charts for 24S-T and 75S-T aluminum-alloy flat compression panels with longitudinal extruded Y-section stiffeners. Comparisons are also made among panels designed from these charts and 24S-T aluminum-alloy panels with formed Z-section stiffeners designed from available design charts.
Date: August 1947
Creator: Dow, Norris F. & Hickman, William A.
System: The UNT Digital Library
High-Speed Wind-Tunnel Tests of an NACA 16-009 Airfoil Having a 32.9-Percent-Chord Flap With an Overhang 20.7 Percent of the Flap Chord (open access)

High-Speed Wind-Tunnel Tests of an NACA 16-009 Airfoil Having a 32.9-Percent-Chord Flap With an Overhang 20.7 Percent of the Flap Chord

Report presenting an investigation to determine the effects of compressibility on the aerodynamic characteristics of a 5-inch-chord NACA 16-009 airfoil with a 32.9-percent-chord flap with a nose overhang and an unsealed gap. Airfoil lift and pitching moment and flap hinge moments were obtained for a range of angles of attack, flap angle ranges, and Mach numbers.
Date: August 1947
Creator: Stevenson, David B. & Byrne, Robert W.
System: The UNT Digital Library
The optical system of the NACA 400,000-frame-per-second motion-picture camera (open access)

The optical system of the NACA 400,000-frame-per-second motion-picture camera

Report presenting the optical principle of the NACA ultrahigh-speed camera. Simplified sketches are included illustrating the optical principle and main design features of the camera, but without minor design details. A detailed description of the camera is provided as well as some sample photographs taken with the camera.
Date: August 1947
Creator: Miller, Cearcy D.
System: The UNT Digital Library
Numerical evaluation of mass-flow coefficient and associated parameters from wake-survey equations (open access)

Numerical evaluation of mass-flow coefficient and associated parameters from wake-survey equations

Report presenting a method for the determination by use of charts of mass-flow coefficient and associated flow parameters from pressure surveys in internal-flow systems. The charts presented cover a wide range of specific parameters through the complete range of subsonic Mach numbers. The equations have also been evaluated for flows that involve the adding of mechanical or thermal energy, such as flows behind radiators or propellers.
Date: August 1947
Creator: Smith, Norman F.
System: The UNT Digital Library
Wind-tunnel investigation of drooped ailerons on a 16-percent-thick low-drag airfoil (open access)

Wind-tunnel investigation of drooped ailerons on a 16-percent-thick low-drag airfoil

Report presenting a wind-tunnel investigation to determine the practicability of the dropped-aileron-type lateral-control device on NACA low-drag airfoils. Section aerodynamic characteristics of an NACA 66(215)-216 airfoil with an aileron of normal profile and an aileron of straight-sided profile with a modified nose shape are presented for various aileron locations, hinge centers, and aerodynamic balances.
Date: August 1947
Creator: Holtzclaw, Ralph W. & Dods, Jules B., Jr.
System: The UNT Digital Library
A preliminary correlation of the behavior of water rudders on seaplanes and flying boats (open access)

A preliminary correlation of the behavior of water rudders on seaplanes and flying boats

From Summary: "This report presents a rough correlation of the dimensions of water rudders of various actual seaplanes and flying boats as related to their behavior. The correlation should be useful for determining the size of a water rudder which will give adequate control for maneuvering at low speeds."
Date: August 1947
Creator: Locke, F. W. S., Jr.
System: The UNT Digital Library
Investigation of a Spoiler-Type Lateral Control System on a Wing with Full-Span Flaps in the Langley 19-Foot Pressure Tunnel (open access)

Investigation of a Spoiler-Type Lateral Control System on a Wing with Full-Span Flaps in the Langley 19-Foot Pressure Tunnel

"Tests of a partial-span model of a large bomber-type airplane were conducted to determine the aerodynamic characteristics of the wing equipped with full-span flaps and a retractable spoiler end aileron lateral control system. The arrangement consisted of (1) a double slotted flap extending over aproximate1y 86 percent of the wing semispan, (2) a 20-percent constant-percentage-chord aileron extending from the outboard end of the flap to the wing tip, and (3) a retractable spoiler, located at the 65-percent wing-chord station and extending from approximately 63 percent of the wing semispan to the wing tip. In addition, tests were made of a wing vent (of 1 and 2 percent of the wing chord located directly behind the spoiler), perforations in the spoiler, a blot or cut-out along the lower edge of the spoiler and spoilers of various spans" (p. 1).
Date: August 1947
Creator: Deters, Owen J. & Russell, Robert T.
System: The UNT Digital Library
Performance and Ranges of Application of Various Types of Aircraft-Propulsion System (open access)

Performance and Ranges of Application of Various Types of Aircraft-Propulsion System

Note presenting a discussion of the performance characteristics of the compound engine, the turbine-propeller engine, the turbojet engine, the turbo ramjet engine, the ramjet engine, and the rocket engine. Insight is provided into the proper position of each of these engine types in the speed-range spectrum of aircraft operation. It is shown that the compound engine, which has the greatest weight per unit thrust and also the lowest specific fuel consumption, gives the longest range.
Date: August 1947
Creator: Cleveland Laboratory Staff
System: The UNT Digital Library