Collection
Technical Report Archive and Image Library
405
National Advisory Committee for Aeronautics Collection
337
Texas Attorney General Opinions
241
Office of Scientific & Technical Information Technical Reports
76
TRAIL Microcard Collection
49
World War Two Collection
20
World War Two Newsmaps
18
Government Documents A to Z Digitization Project
16
Texas State Publications
15
USDA Farmers' Bulletins
8
3 More
Serial/Series Title
Country
States
777 Matching Results
Results open in a new window/tab.
Results:
1 - 24 of
777
next
Efficiency Rating Systems Preliminary Report
This report is about the Efficiency Rating Systems Preliminary Report
Date:
May 1947
Creator:
Graves, W. Brooke
Object Type:
Report
System:
The UNT Digital Library
A method for studying the hunting oscillations of and airplane with a simple type of automatic control
Report presenting a method for predicting the amplitude and frequency, under certain simplifying conditions, of the hunting oscillations of an automatically controlled aircraft with lag in the control system or in response of the aircraft to the controls. Formulas are given expressing the response to a variation of signal in terms of response to a unit signal.
Date:
May 1944
Creator:
Jones, Robert T.
Object Type:
Report
System:
The UNT Digital Library
The effect of compressibility on two-dimensional tunnel-wall interference for a symmetrical airfoil
Summary: The effective change in the velocity of flow past a wing section, caused by the presence of wind-tunnel walls, is known for potential flow. This theory is extended by investigation of the two-dimensional compressible flow past a thin Rankine Oval. It is shown that for a symmetrical section at zero angle of attack the velocity increment due to the tunnel walls in the incompressible case must be multiplied by the factor 1/1-M^2 to take account of compressibility effects. The Mach number, M, corresponds to conditions in the wind-tunnel test section with the model removed (p. 1.).
Date:
May 1943
Creator:
Nitzberg, Gerald E.
Object Type:
Report
System:
The UNT Digital Library
Emergency Measures for Increasing the Range of Fighter Airplanes
"An analysis was made to show the relative effectiveness of streamline external fuel tanks, a fuel tank in the form of a wing mounted in a biplane position, and auxiliary wing panels attached at the wing tips to increase the span as temporary means for increasing the range of a fighter-type airplane. Figures and charts for the various devices considered show the results of calculations of range, duration of flight, and take-off distance for both land-base and carrier operation. The results indicated that the wing-tip extensions were the most promising of the devices considered" (p. 1).
Date:
May 1943
Creator:
Jones, Robert T. & Wetmore, Joseph W.
Object Type:
Report
System:
The UNT Digital Library
Fuel-Evaporation Loss as Determined by the Change in the Specific Gravity of the Fuel in an Aircraft Fuel Tank
Report discusses the results of an investigation to determine the feasibility of using the change in the specific gravity of fuels in aircraft fuel tanks to measure fuel-vaporization loss. Six fuels were tested via fuel-distillation tests and simulated-flight tests. An equation based on the specific gravity of the fuel is also described.
Date:
May 1945
Creator:
Stone, Charles S. & Kramer, Walter E.
Object Type:
Report
System:
The UNT Digital Library
Profile-Drag Coefficients of Conventional and Low-Drag Airfoils as Obtained in Flight
"The results of flight investigations of the profile drag of several carefully finished conventional and low-drag airfoils are presented. The results indicated that in all cases lower profile-drag coefficients were obtained with the low-drag than with the conventional airfoils over the range of lift coefficient tested and that, for comparable conditions of lift coefficient and Reynolds number, the low-drag airfoils may have profile-drag coefficients which are at least 27 percent lower than the profile-drag coefficients of the conventional airfoils" (p.1).
Date:
May 1944
Creator:
Zalovcik, John A.
Object Type:
Report
System:
The UNT Digital Library
An Experimental Investigation of Rectangular Exhaust-Gas Ejectors Applicable for Engine Cooling
Report presenting an experimental investigation of rectangular exhaust-gas ejector pump to provide data that would serve as a guide to the design of ejector applications for aircraft engines with marginal cooling. With a decrease in the quantity of air pumped and an increase in the length of an ejector, the ejector pressure rise increases to optimum values. Results regarding straight ejectors, diffuser ejectors, curved ejectors, ejector aspect ratio, divided ejectors, multistage ejectors, and nozzle-exit effects are provided.
Date:
May 1945
Creator:
Manganiello, Eugene J. & Bogatsky, Donald
Object Type:
Report
System:
The UNT Digital Library
An Investigation of a Thermal Ice-Prevention System for a C-46 Cargo Airplane 5: Effect of Thermal System on Airplane Cruise Performance
Report presenting flight tests conducted to evaluate the effect of a thermal ice prevention system on the aerodynamic performance of a C-46 cargo airplane. The installation of the thermal ice-prevention system was found to reduce the indicated airspeed by about 6 miles per hour. Results regarding the overall performance change resulting from the installation of the thermal system, reduction of power attributed to heat-exchanger exhaust-gas back pressure, reduction of power attributed to the internal and external drag of the thermal system, and the additional airplane gross weight attributed to the thermal system are provided.
Date:
May 1945
Creator:
Selna, James
Object Type:
Report
System:
The UNT Digital Library
An Investigation of a Thermal Ice-Prevention System for a C-46 Cargo Airplane 6: Dry-Air Performance of Thermal System at Several Twin- and Single-Engine Operating Conditions at Various Altitudes
Report presenting flight tests to establish the dry-air-performance characteristics of a thermal ice-prevention system at various operating conditions and altitudes. Results regarding twin-engine tests and single-engine tests of characteristics such as skin temperatures and location of heating are provided.
Date:
May 1945
Creator:
Selna, James & Kees, Harold L.
Object Type:
Report
System:
The UNT Digital Library
University of Chicago Spectroscopic Laboratory Annual Report: September 1, 1948 - May 31, 1949, Part 1
Report containing articles, manuscripts, and tabulations of recorded spectra created by the Spectroscopic Laboratory of the University of Chicago.
Date:
1949-05~
Creator:
University of Chicago. Laboratory of Molecular Structure and Spectra.
Object Type:
Report
System:
The UNT Digital Library
Winter legumes for green manure in the Cotton Belt.
Describes varieties of the winter legumes used for "green manure" in the southern United States; provides suggestions for considerations to make when using winter legumes on farmland.
Date:
May 1942
Creator:
McKee, Roland. & McNair, A. D.
Object Type:
Book
System:
The UNT Digital Library
Tactics and technique of division artillery and higher artillery echelons.
Describes the mission, organization, and principles of employment of the field artillery unit.
Date:
May 24, 1944
Creator:
United States. War Department.
Object Type:
Book
System:
The UNT Digital Library
Ordnance maintenance : plotting boards for field artillery
Contains instructions for inspection, assembly, disassembly, maintenance, and repair of plotting boards for field artillery.
Date:
May 21, 1942
Creator:
United States. War Department.
Object Type:
Book
System:
The UNT Digital Library
Suction apparatus : portable, electric.
Contains information on the operation and maintenance of five types of portable electric suction apparatus used to remove blood and other fluids from body cavities during surgery.
Date:
May 1945
Creator:
United States. War Department.
Object Type:
Book
System:
The UNT Digital Library
Gasoline stoves and burners
Provides instructions for the operation and maintenance of gasoline stoves and burners used as sources of heat in medical equipment, such as sterilizers, autoclaves, incubators, and a distilling apparatus. Contains descriptions of the major units and their functions.
Date:
May 1945
Creator:
United States. War Department.
Object Type:
Book
System:
The UNT Digital Library
Aircraft radio shop practice.
Discusses maintenance and repair of the component parts of aircraft radio equipment, and the correct use of tools.
Date:
May 1, 1942
Creator:
United States. War Department.
Object Type:
Book
System:
The UNT Digital Library
Good pastures.
A guide to improving pastures for the purpose of increasing production during wartime.
Date:
May 1943
Creator:
Semple, Arthur T. (Arthur Truman), 1895- & Hein, M. A. (Mason August), b. 1894
Object Type:
Book
System:
The UNT Digital Library
Spin Tests of Two Models of a Low-Wing Monoplane to Investigate Scale Effect in the Model Test Range
Note presenting testing performed on scale models of a modern low-wing monoplane in the 15-foot free-spinning wind tunnel. Results are presented in the form of charts that afford a direct comparison between the spins of the two models for a number of different conditions. The results indicate that, within the range of Reynolds numbers used in the present investigation, such factors as difficulty of ballasting and testing are more important in determining proper model size than the changes in scale effect likely to result from the use of different sizes of models.
Date:
May 1941
Creator:
Donlan, Charles J.
Object Type:
Report
System:
The UNT Digital Library
The Ryegrasses.
Describes different kinds of ryegrass, the best climate and soil for its growth, and the steps a farmer should take for successful hay and pasture growth.
Date:
May 1940
Creator:
Schoth, H. A. (Harry August), b. 1891 & Hein, M. A. (Mason August), b. 1894
Object Type:
Book
System:
The UNT Digital Library
Applicability of Radio to Emergency Mine Communications: Progress Report, September 1946 to November 1947
Report issued by the Bureau of Mines over the progress made in emergency mine communications. The results of testing done on low-frequency radio communication are presented. This report includes tables, graphs, illustrations, and photographs.
Date:
May 1948
Creator:
Felegy, E. W. & Coggeshall, E. J.
Object Type:
Report
System:
The UNT Digital Library
Magnetic Survey of the Florida Peninsula
Report issued by the U.S. Bureau of Mines over magnetic surveys conducted on the Florida peninsula. Measurements, methods, and instrumentation used for the survey are presented. Tables and maps are included in this report.
Date:
May 1945
Creator:
Lee, Frederick William; Swartz, J. H. & Hemberger, S. J.
Object Type:
Report
System:
The UNT Digital Library
Recovery of Alumina From Kaolin by the Lime-Soda Sinter Process
Report issued by the U.S. Bureau of Mines on exploration of kaolin clay deposits for alumina. Properties of the kaolin clay and alumina recovered are listed. This report includes tables, graphs, and illustrations.
Date:
May 1947
Creator:
Cservenyak, Frank J.
Object Type:
Report
System:
The UNT Digital Library
Comparative Study of Magnetic Surveys of Worcester County, Maryland: Made on the Ground and From Airplane Observations
Report issued by the U.S. Bureau of Mines on magnetic surveys conducted on Worcester County, Maryland. The results of observations obtained on the ground and from the air are presented. This report includes tables, graphs, and maps.
Date:
May 1947
Creator:
Kuehn, Hugo E. & Dent, Guy E.
Object Type:
Report
System:
The UNT Digital Library
Increased Pig-Iron Output Through Improved Coke
Report issued by the U.S. Bureau of Mines on the increase of pig-iron during steel production. The machinery, organization, and methods used in the study are presented. This report includes tables, graphs, and photographs.
Date:
May 1943
Creator:
Schmidt, L. D.; Schroeder, W. C. & Fieldner, Arno Carl
Object Type:
Report
System:
The UNT Digital Library