Collection
Technical Report Archive and Image Library
431
National Advisory Committee for Aeronautics Collection
366
Texas Attorney General Opinions
258
Office of Scientific & Technical Information Technical Reports
93
TRAIL Microcard Collection
44
World War Two Collection
24
Government Documents A to Z Digitization Project
23
World War Two Newsmaps
18
Texas State Publications
15
USDA Farmers' Bulletins
4
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Flight investigation of the cooling characteristics of a two-row radial engine installation 1: cooling correlation
Report presenting flight tests to determine the cooling characteristics of a two-row radial engine at altitude in a twin-engine airplane and to investigate the accuracy with which low-altitude cooling-correlation equations can be used for making cooling predictions at higher altitudes. Satisfactory correlation of the cooling variables was obtained at both altitudes by the NACA-cooling method.
Date:
July 1946
Creator:
Bell, E. Barton; Morgan, James E.; Disher, John H. & Mercer, Jack R.
Object Type:
Report
System:
The UNT Digital Library
A new device for filtering hydrofluoric acid and other strong acids. Information report
During the course of a research problem involving hydrofluoric acid it became necessary to filter concentrated hydrofluoric solutions to remove various solid materials. The search for a suitable filter media finally led to the use of a commercially manufactured plastic material known as ``Sponge Teflon`` (polytetrafluoroethylone) which is produced by the DuPont Company. This material, which comes in 1/8 in. sheets, is used primarily as a gasket material in acid lines, and is impervious to all acids, including hydrofluorle acid.
Date:
July 9, 1948
Creator:
Bell, R.
Object Type:
Report
System:
The UNT Digital Library
The knock-limited performance of several miscellaneous fuels blended with a base fuel
Report presenting investigations to determine the knock-limited performance of blends of 90 percent by volume AN-F-28, Amendment-2 fuel, and 10 percent by volume of the following fuels: tert-amyl alcohol, 2,6-dimethyl-1, 4-dioxane, methyl tert-butyl ether, methyl tert-butyl ketone, methyl isobutyl ketone, mesityl oxide, acetone, and diisopropyl ketone.
Date:
July 1944
Creator:
Bellman, Donald R.
Object Type:
Report
System:
The UNT Digital Library
Cotton Ginning for Pure-Seed Preservation.
Describes the steps and equipment necessary for cotton ginning and for the prevention of seed mixing.
Date:
July 1942
Creator:
Bennett, Charles A. (Charles Abel), b. 1889 & Gerdes, Francis L. (Francis Leo), 1907-
Object Type:
Book
System:
The UNT Digital Library
The Path of Carbon in Photosynthesis VII Respiration andPhotosynthesis
The relationship of respiration to photosynthesis in barley seedling leaves and the algae, Chlorella and Scenedesmus, has been investigated using radioactive carbon dioxide and the techniques of paper chromatography and radioautography. The plants are allowed to photosynthesize normally for thirty seconds in c{sup 14}O{sub 2} after which they are allowed to respire in air or helium in the light or dark. Respiration of photosynthetic intermediates as evidenced by the appearance of labeled glutomic, isocitric, fumaric and succinic acids is slower in the light than in the dark. Labeled glycolic acid is observed in barley and algae. It disappears rapidly in the dark and is maintained and increased in quantity in the light in C0{sub 2}-free air.
Date:
July 21, 1949
Creator:
Benson, A. A. & Calvin, M.
Object Type:
Report
System:
The UNT Digital Library
Graphical and Analytical Methods for the Determination of a Flow of a Compressible Fluid Around an Obstacle
"Chaplygin introduced the hodograph method in the theory of compressible fluid flows and developed a method for constructing stream functions of such flows. This method, which has been extensively used in investigation of compressible fluid flows, is limited in certain respects. The expression for the stream function obtained in this manner can represent only certain types of flow patterns. In general, flow patterns obtained in this way cannot represent the whole flow around an obstacle, but only a part of such a flow, and therefore several expressions are needed in order to obtain the whole flow" (p. 1).
Date:
July 1945
Creator:
Bergman, Stefan
Object Type:
Report
System:
The UNT Digital Library
On the Circulatory Subsonic Flow of a Compressible Fluid Past a Circular Cylinder
"The circulatory subsonic flow around an infinite circular cylinder is computed using the linearized pressure-volume relation, by a method developed in a previous report. Formulas and graphs are given for the velocity and pressure distributions, the circulation, the lift, and the dependence of the critical Mach number upon the position of the stagnation point" (p. 1).
Date:
July 1945
Creator:
Bers, Lipman
Object Type:
Report
System:
The UNT Digital Library
Diagrams for Calculation of Airfoil Lattices
"The field for curved blades is represented by a vortex series with a vortex removed at the blade point. Further, an example of calculation of a curved blade from this series is given, whereby the necessary accuracy required of the different methods in practice is shown according to the case considered" (p. 1).
Date:
July 1942
Creator:
Betz, Albert
Object Type:
Report
System:
The UNT Digital Library
Abstracts Pertaining to Seaplanes
Report discussing about 400 references pertaining to the hydrodynamic design of seaplanes have been compiled, and the information is presented in the form of abstracts classified under six main headings.
Date:
July 24, 1947
Creator:
Bidwell, Jerold M. & King, Douglas A.
Object Type:
Report
System:
The UNT Digital Library
Relation of Preignition and Knock to Allowable Engine Temperatures
"The results are given of an investigation of some of the limitations that now prevent increases in the temperature level of engine cylinder heads, and a review of previous work in the field is included to supplement these results. Attention was given, in particular, to the effects of fuel knock and surface ignition on cylinder temperatures and the effects of cylinder temperatures on performance. Data were obtained from a Wright C9GC air-cooled cylinder and from a Lycoming O-1230 liquid-cooled cylinder" (p. 1).
Date:
July 1943
Creator:
Biermann, Arnold E. & Corrington, Lester C.
Object Type:
Report
System:
The UNT Digital Library
Control of Cylinder Temperatures by Thermostatically Operated Internal-Coolant Valves
Report discusses the results of testing conducted to determine the performance of automatic, internal-coolant valves actuated by cylinder temperatures.The performance of the valves with respect to temperature sensitivity, rapidity of response, and hunting characteristics is described. The relative effects on cylinder performance obtained by internally supplying water and additional fuel were also examined.
Date:
July 1945
Creator:
Biermann, Arnold E.; Henneberry, Hugh M. & Miller, George R.
Object Type:
Report
System:
The UNT Digital Library
Economy of internally cooling only the overheated cylinders of aircraft engines
Report presenting an analysis of cylinder-to-cylinder temperature and mixture distributions of four different aircraft engines to determine the possible economy of automatically supply water or additional fuel to only those cylinders having excessive temperatures. The cooling problem as distinguished from the fuel-knock problem was studied and an analysis limited to those cases in which additional cooling is ordinarily obtained by carburetor enrichment was made.
Date:
July 1945
Creator:
Biermann, Arnold E.; Miller, George R. & Henneberry, Hugh M.
Object Type:
Report
System:
The UNT Digital Library
Wind-Tunnel Tests of Four- and Six-Blade Single- and Dual-Rotating Tractor Propellers
"Test of 10-foot diameter, four and six blade single-rotating and dual-rotating propellers were conducted in the NACA propeller-research tunnel. The propellers were mounted at the front end of a streamline body incorporating spinners to house the hub portions. The effect of a symmetrical wing mounted in the slipstream ranged from 20 degrees to 65 degrees setting corresponds to airplane speeds greater than 500 miles per hour. The results indicate that dual-rotating propellers were from 0 to 6 percent more efficient than single-rotating ones; but, when the propellers operated in the presence of a wing, the gain was reduced by about one-half" (p. 319).
Date:
July 13, 1942
Creator:
Biermann, David & Hartman, Edwin P.
Object Type:
Report
System:
The UNT Digital Library
Calculation of the Pressure Distribution on Bodies of Revolution in the Subsonic Flow of a Gas Part 1 - Axially Symmetrical Flow
"The present report concerns a method of computing the velocity and pressure distributions on bodies of revolution in axially symmetrical flow in the subsonic range. The differential equation for the velocity potential Phi of a compressible fluid motion is linearized tn the conventional manner, and then put in the form Delta(Phi) = 0 by affine transformation. The quantity Phi represents the velocity potential of a fictitious incompressible flow, for which a constant superposition of sources by sections is secured by a method patterned after von Karman which must comply with the boundary condition delta(phi)/delta(n) = 0 at the originally specified contour" (p. 1).
Date:
July 1947
Creator:
Bilharz, Herbert & Hölder, Ernst
Object Type:
Report
System:
The UNT Digital Library
Effect of leakage past aileron nose on aerodynamic characteristics of plain and internally balanced ailerons on NACA 66(215)-216, a = 1.0 airfoil
Report presenting an investigation in two-dimensional flow to determine the effect of leakage past the aileron nose on the aerodynamic characteristics of ailerons. The effects of amount and type of leakage, aileron contour, and Mach and Reynolds number are investigated.
Date:
July 1945
Creator:
Bird, J. D.
Object Type:
Report
System:
The UNT Digital Library
National Motor-Gasoline Survey: Winter 1947-48
Report issued by the Bureau of Mines on the motor-fuels sold during the winter of 1947-1948. Characteristics of the fuel samples obtained are listed. This report includes tables, graphs, and a map.
Date:
July 1948
Creator:
Blade, O. C.
Object Type:
Report
System:
The UNT Digital Library
National Motor-Gasoline Survey: Winter 1948-49
Report issued by the Bureau of Mines over surveys conducted on the motor fuels sold during the winter of 1948-1949. The properties of the fuels sampled are presented. This report includes tables, graphs, and maps.
Date:
July 1949
Creator:
Blade, O. C.
Object Type:
Report
System:
The UNT Digital Library
National Motor-Gasoline Survey: Winter 1945-46
Report issued by the U.S. Bureau of Mines on the motor fuels sold during the winter of 1945-46. The characteristics of the fuels sold, and the regions they were sold in are listed. This report includes tables, and maps.
Date:
July 1946
Creator:
Blade, O. C. & Sponsler, C. R.
Object Type:
Report
System:
The UNT Digital Library
Tables and Charts for the Evaluation of Profile Drag From Wake Surveys at High Subsonic Speeds
Report presents tables and charts for the evaluation of profile drag from wake surveys at high supersonic speeds. Two methods of evaluation are presented: an exact method that can be used on a wake of any shape and a simple approximate method that can be used when the variation of total-pressure loss across the wave has a typical form.
Date:
July 1945
Creator:
Block, Myron J. & Katzoff, S.
Object Type:
Report
System:
The UNT Digital Library
An Investigation of Aircraft Heaters 26: Development of a Sensitive Plated-Type Thermopile for Measuring Radiation
Report presenting an analysis of the factors determining the power efficiency of radiation thermopiles of the type in which receivers consist of parts of conducts themselves or of coatings or other electrically insulating materials in intimate contact with the conductors. Criterions for maximum power efficiency are calculated for these thermopiles, which can then be applied to general thermopile designs.
Date:
July 1948
Creator:
Boelter, L. M. K.; Dempster, E. R.; Bromberg, R. & Gier, J. T.
Object Type:
Report
System:
The UNT Digital Library
An investigation of aircraft heaters 31: summary of laboratory testing of several exhaust-gas and air heat exchangers
Report presenting a comparison of the thermal performance and pressure-drop characteristics of heat exchangers on a heat-exchanger test stand. The exchangers included parallel and cross-flow units as well as extended-surface and all-prime-surface units.
Date:
July 1949
Creator:
Boelter, L. M. K.; Guibert, A. G.; Romie, F. E.; Sanders, V. D. & Rademacher, J. M.
Object Type:
Report
System:
The UNT Digital Library
An Investigation of Aircraft Heaters 27: Distribution of Heat-Transfer Rate in the Entrance Section of a Circular Tube
"Experimental data on the variation of the point unit thermal conductance in the entrance section of a circular tube are presented for 16 different flow conditions of the entering air. Results are compared with values calculated from existing analytical solutions. The average (integrated mean with length) unit thermal conductance is also calculated for eight entering-air conditions and is compared with values resulting from analytical methods" (p. 1).
Date:
July 1948
Creator:
Boelter, L. M. K.; Young, G. & Iversen, H. W.
Object Type:
Report
System:
The UNT Digital Library
Thermodynamic Charts for the Computation of Fuel Quantity Required for Constant-Pressure Combustion With Diluents
Report presenting charts for calculating the quantity of hydrocarbon fuel required to attain a specific combustion temperature when water, alcohol, water-alcohol mixtures, liquid ammonia, liquid carbon dioxide, liquid nitrogen, liquid oxygen, or their mixtures are added to air as diluents or refrigerants.
Date:
July 1948
Creator:
Bogart, Donald; Okrent, David & Turner, L. Richard
Object Type:
Report
System:
The UNT Digital Library
Blade Design Data for Axial-Flow Fans and Compressors
Report presenting an investigation to obtain blade design data for high-efficiency axial-flow fans and compressors, which were carried out in a two-dimensional low-speed cascade tunnel. The effects of camber, solidity, and stagger on blade turning angle and the shape of pressure distributions were determined for a family of five low-drag airfoils.
Date:
July 1945
Creator:
Bogdonoff, Seymour M. & Bogdonoff, Harriet E.
Object Type:
Report
System:
The UNT Digital Library