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1,791
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1,368
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262
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[Report of Commission Regarding Houses at Fort McIntosh]
Brief report of a commission in Laredo regarding the possibility of buying or renting houses near Fort McIntosh.
Date:
June 26, 1860
Creator:
Garcia, Benito
System:
The Portal to Texas History
Natural History of the Queen Charlotte Islands, British Columbia. Natural History of the Cook Inlet Region, Alaska
Results of 1900 expedition on Queen Charlotte Islands describing natural history.
Date:
September 26, 1901
Creator:
Osgood, Wilfred H.
System:
The UNT Digital Library
A Biological Investigation of the Athabaska-Mackenzie Region
From introduction: "Report of 1901 expedition of Athabaska-Mackenzie region to obtain representative collections of the mammals, birds, and plants."
Date:
October 26, 1908
Creator:
Preble, Edward A.
System:
The UNT Digital Library
Investigation of Air Flow in Open-Throat Wind Tunnels
"Tests were conducted on the 6-inch wind tunnel of the National Advisory Committee for Aeronautics to form a part of a research on open-throat wind tunnels. The primary object of this part of the research was to study a type of air pulsation which has been encountered in open-throat tunnels, and to find the most satisfactory means of eliminating such pulsations. In order to do this it was necessary to study the effects of different variable on all of the important characteristics of the tunnel" (p. 399).
Date:
September 26, 1928
Creator:
Jacobs, Eastman N.
System:
The UNT Digital Library
Experimental and analytical determination of the motion of hydraulically operated valve stems in oil engine injection systems
This research on the pressure variations in the injection system of the N.A.C.A. Spray Photography Equipment and on the effects of these variations on the motion of the timing valve stem was undertaken in connection with the study of fuel injection systems for high-speed oil engines. The methods of analysis of the pressure variations and the general equation for the motion of the spring-loaded stem for the timing valve are applicable to a spring-loaded automatic injection valve, and in general to all hydraulically operated valves. A sample calculation for a spring-loaded automatic injection valve is included.
Date:
December 26, 1928
Creator:
Gelalles, A. G. & Rothrock, A. M.
System:
The UNT Digital Library
The NACA Apparatus for Studying the Formation and Combustion of Fuel Sprays and the Results From Preliminary Tests
"This report describes the apparatus as designed and constructed at the Langley Memorial Aeronautical Laboratory, for studying the formation and combustion of fuel sprays under conditions closely simulating those occurring in a high-speed compression-ignition engine. The apparatus consists of a single-cylinder modified test engine, a fuel-injection system so designed that a single charge of fuel can be injected into the combustion chamber of the engine, an electric driving motor, and a high-speed photographic apparatus. The cylinder head of the engine has a vertical-disk form of combustion chamber whose sides are glass windows" (p. 549).
Date:
August 26, 1931
Creator:
Rothrock, A. M.
System:
The UNT Digital Library
The Aerodynamic Characteristics of Airfoils at Negative Angles of Attack
From Introduction: "The present report gives all the results, including those published in reference 1 and the results of previously un-published tests tests of the airfoils at positive angles of attack."
Date:
February 26, 1932
Creator:
Anderson, Raymond F.
System:
The UNT Digital Library
The International Metric System of Weights and Measures
General overview of the metric system.
Date:
May 26, 1932
Creator:
unknown
System:
The UNT Digital Library
The drag of two streamline bodies as affected by protuberances and appendages
This report presents the results of wind tunnel tests of two airship models conducted to determine the drag coefficients at zero pitch, and the effect of fins and cars and of flat and streamlined protuberances located at various positions along the hull. During the investigation the stern of one model was rounded off to produce a blunter shape. The extreme range of the Reynolds number based on the over-all length of the models was from 1,300,000 to 33,000,000. At large values of the Reynolds number the streamlined protuberance affected the drag very little, and the additional drag caused by the flat protuberance was less than the calculated drag by the protuberance alone. The fins and cars together increased the bare-hull drag about 20 per cent.
Date:
September 26, 1932
Creator:
Abbott, Ira H.
System:
The UNT Digital Library
Tests of Nacelle-Propeller Combinations in Various Positions with Reference to Wings 5: Clark Y Biplane Cellule - NACA Cowled Nacelle - Tractor Propeller
"This report is the fifth of a series giving the results obtained from wind tunnel tests on the interference drag and propulsive efficiency of nacelle-propeller-wing combinations. This report gives results of tests of an NACA cowled air-cooled engine nacelle with tractor propeller located in 12 positions with reference to a Clark Y biplane cellule" (p. 603).
Date:
January 26, 1934
Creator:
Valentine, E. Floyd
System:
The UNT Digital Library
Heat transfer from finned metal cylinders in an air stream
This report presents the results of tests made to supply design information for the construction of metal fins for the cooling of heated cylindrical surfaces by an air stream. A method is given for determining fin dimensions for a maximum heat transfer with the expenditure of a given amount of material for a variety of conditions of air flow and metals.
Date:
April 26, 1934
Creator:
Biermann, Arnold E. & Pinkel, Benjamin
System:
The UNT Digital Library
The effect of baffles on the temperature distribution and heat-transfer coefficients of finned cylinders
This report presents the results of an investigation to determine the effect of baffles on the temperature distribution and the heat-transfer coefficient of finned cylinders. The tests were conducted in a 30-inch wind tunnel on electrically heated cylinders with fins of 0.25 and 0.31 inch pitch. The results of these tests showed that the use of integral baffles gave a reduction of 31.9 percent in the rear wall temperatures and an increase of 54.2 percent in the heat transfer coefficient as compared with a cylinder without baffles.
Date:
September 26, 1934
Creator:
Schey, Oscar W. & Rollin, Vern G.
System:
The UNT Digital Library
Effects of air-fuel spray and flame formation in a compression-ignition engine
"High-speed motion pictures were taken at the rate of 2,500 frames per second of the fuel spray and flame formation in the combustion chamber of the NACA combustion apparatus. The compression ratio was 13.2 and the speed 1,500 revolutions per minute. An optical indicator was used to record the time-pressure relationship in the combustion chamber. The air-fuel ratio was varied from 10.4 to 365. The results showed that as the air-fuel ratio was increased definite stratification of the charge occurred in the combustion chamber even though moderate air flow existed. The results also showed the rate of vapor diffusion to be relatively slow" (p. 119).
Date:
August 26, 1935
Creator:
Rothrock, A. M. & Waldron, C. D.
System:
The UNT Digital Library
Comparative Flight and Full-Scale Wind-Tunnel Measurements of the Maximum Lift of an Airplane
"Determinations of the power-off maximum lift of a Fairchild 22 airplane were made in the NACA full-scale wind tunnel and in flight. The results from the two types of test were in satisfactory agreement. It was found that, when the airplane was rotated positively in pitch through the angle of stall at rates of the order of 0.1 degree per second, the maximum lift coefficient was considerably higher than that obtained in the standard tests, in which the forces are measured with the angles of attack fixed. Scale effect on the maximum lift coefficient was also investigated" (p. 161).
Date:
October 26, 1937
Creator:
Silverstein, Abe; Katzoff, S. & Hootman, James A.
System:
The UNT Digital Library
The Transition Phase in the Take-Off of an Airplane
Report presents the results of an investigation to determine the character and importance of the transition phase between the ground run and steady climb in the take-off of an airplane and the effects of various factors on this phase and on the air-borne part of the take-off as a whole. The information was obtained from a series of step-by-step integrations, which defined the motion of the airplane during the transition and which were based on data derived from actual take-off tests of a Verville AT airplane. Both normal and zoom take-offs under several loading and take-off speed conditions were considered.
Date:
October 26, 1937
Creator:
Wetmore, J. W.
System:
The UNT Digital Library
Determination of boundary-layer transition on three symmetrical airfoils in the NACA full-scale wind tunnel
For the purpose of studying the transition from laminar to turbulent flow, boundary-layer measurements were made in the NACA full-scale wind tunnel on three symmetrical airfoils of NACA 0009, 0012, and 0018 sections. The effects of variations in lift coefficient, Reynolds number, and airfoil thickness on transition were investigated. Air speed in the boundary layer was measured by total-head tubes and by hot wires; a comparison of transition as indicated by the two techniques was obtained. The results indicate no unique value of Reynolds number for the transition, whether the Reynolds number is based upon the distance along the chord or upon the thickness of the boundary layer at the transition point. In general, the transition is not abrupt and occurs in a region that varies in length as a function of the test conditions.
Date:
May 26, 1938
Creator:
Silverstein, Abe & Becker, John V.
System:
The UNT Digital Library
Circumventing chloride ion trouble Columbia River water
This report contains data acquired during sampling of the Columbia River water on March 26, 1945. Topics of discussion include; the elevation of chlorine levels from 4 ppm to 20 ppm, what steps should be taken to remediate the problem, and the various processes that were taken into consideration for the clean up of this chlorine. Separation processes considered include; ion exchange, distillation, precipitation, heat exchange, and recirculation through a cooling tower.
Date:
March 26, 1943
Creator:
Worthington, H.
System:
The UNT Digital Library
Water analyses: Project 9536
None
Date:
March 26, 1943
Creator:
Daniels, H. T.
System:
The UNT Digital Library
Technical Division weekly progress report for period ending May 22, 1943
This report details Technical Division activities for the week ending May 22, 1943.
Date:
May 26, 1943
Creator:
unknown
System:
The UNT Digital Library
Metal Hydrides Final Report
None
Date:
July 26, 1943
Creator:
Alexander, P. P.
System:
The UNT Digital Library
Specifications for the Freezing Point Method for Determination of the Amount of HF in UF₆
From introduction: "You will find enclosed the specifications for the freezing point method for determination of the amount of HF in UF₆. The specification for cleaning new shipping containers is also included."
Date:
February 26, 1944
Creator:
Priest, Homer F.
System:
The UNT Digital Library
Explosives TNX Technical Division, Hanford weekly report for period ending July 25, 1944
Progress on finding suitable water conditions for start-up had been approached as closely as possible with our present equipment and information as to the requirements. The water composition should be attainable that is not corrosive or build up a film rapidly, and we have means available for removal of such films. Slug classification methods were analyzed from a dimensional standpoint. Analysis of current CMX data was undertaken with the objective of establishing allowable variations in pressure drop in W-tubes due to film formation. Calculations were made of the number of slugs which have jacket temperatures in excess of various values, for various loading arrangements. On July 26 the proposed loading of the discharge nozzle is to be checked on CMX tube 1 during an inspection shut-down. Evacuation procedures in the event of a catastrophe in the 100-B area were discussed with W.E. Rapp during a visit to that area on July 19, 1944. Tests for slug leaks will not be less severe with water in the autoclave than with steam, and have a considerable chance to be more decisive, especially if a wetting agent is added to the water. Calculations were made on the sensitivity to be expected from three …
Date:
July 26, 1944
Creator:
Worthington, H.
System:
The UNT Digital Library
Maximum Force of a Warped Rod Against a Rigid Constraint
Abstract. Given the maximum intrinsic curvature of a rod, the maximum force required to confine it between parallel rigid walls is computed.
Date:
October 26, 1944
Creator:
Martin, A. V.
System:
The UNT Digital Library
METHOD OF WASHING URANIUM METAL SAWDUST
None
Date:
February 26, 1945
Creator:
Oppold, W.A.
System:
The UNT Digital Library