Resource Type
Collection
Texas Attorney General Opinions
1,744
Technical Report Archive and Image Library
190
National Advisory Committee for Aeronautics Collection
173
Government Documents A to Z Digitization Project
40
USDA Farmers' Bulletins
33
Texas State Publications
15
Government Documents General Collection
11
USGS Topographic Map Collection
9
United States Experiment Station Record
3
Texas County Inventories
2
11 More
Serial/Series Title
NACA Technical Notes
63
NACA Technical Memorandums
41
NACA Technical Reports
35
Farmers' bulletin (United States. Dept. of Agriculture)
29
NACA Special Reports
23
Leaflet (United States. Department of Agriculture)
18
Farm Credit Administration Bulletins
10
NACA Wartime Reports
10
United States Bureau of Mines Reports
9
Monthly Report of the Attorney General of the State of Texas
8
37 More
States
2,034 Matching Results
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Acceleration, Stress, and Deflection Measurements on the XB-15 Bomber in Gusty Air
From Introduction: "This report presents the results of these tests which cover a total of about 70 flying hours on this airplane."
Date:
June 1939
Creator:
Pearson, Henry A.
Object Type:
Report
System:
The UNT Digital Library
Activation of hydrocarbons and the octane number
This report presents an examination of the history of research on engine knocking and the various types of fuels used in the investigations of this phenomenon. According to this report, the spontaneous ignition of hydrocarbons doped with oxygen follows the logarithmic law within a certain temperature range, but not above 920 degrees K. Having extended the scope of investigations to prove hydrocarbons, the curves of the mixtures burned by air should then be established by progressive replacement of pure iso-octane with heptane. Pentane was also examined in this report.
Date:
October 1939
Creator:
Peschard, Marcel
Object Type:
Report
System:
The UNT Digital Library
Adhesion of Ice in Its Relation to the De-Icing of Airplanes
From Summary: "The various possible means of preventing ice adhesion on airplane surfaces are critically reviewed. Results are presented of tests of the adhesives forces between ice and various solid and liquid forces. It is concluded that the de-icing of airplane wings by heat from engine exhaust shows sufficient promise to warrant full-scale tests. For propellers, at least, and possibly for certain small areas such as windshields, radio masts, etc. the use of de-icing or adhesion-preventing liquids will provide the best means of protection."
Date:
August 1939
Creator:
Rothrick, A. M. & Selden, R. F.
Object Type:
Report
System:
The UNT Digital Library
Aerodynamic Characteristics of a 4-Engine Monoplane Showing Comparison of Air-Cooled and Liquid-Cooled Engine Installations
From Introduction: "An investigation has been conducted in the N.A.C.A. full-scale wind tunnel to determine the aerodynamic characteristics of a 1/4-scale model of a 4-engine monoplane when equipped with comparable air-cooled engine and liquid-cooled engine installations. The air-cooled engine installation consisted of nacelles equipped with N..A.C.A. cowlings and oil coolers located in the leading edge of the wing."
Date:
July 1939
Creator:
Silverstein, Abe & Wilson, Herbert A., Jr.
Object Type:
Report
System:
The UNT Digital Library
The aerodynamic characteristics of six full-scale propellers having different airfoil sections
From Summary: "Wind-tunnel tests are reported of six 3-blade 10-foot propellers operated in front of a liquid-cooled engine nacelle. The propellers were identical except for blade airfoil sections, which were: Clark y, R.A.F. 6, NACA 4400, NACA 2400-34, NACA 2rsub200, and NACA 6400. The range of blade angles investigated extended for 15 degrees to 40 degrees for all propellers except the Clark y, for which it extended to 45 degrees. The results showed that the range in maximum efficiency between the highest and lowest values was about 3 percent. The highest efficiencies were for the low-camber sections."
Date:
1939
Creator:
Biermann, David & Hartman, Edwin P.
Object Type:
Report
System:
The UNT Digital Library
Aircraft rate-of-climb indicators
From Summary: "The theory of the rate-of-climb indicator is developed in a form adapted for application to the instrument in its present-day form. Certain dynamic effects, including instrument lag, and the use of the rate-of-climb indicator as a statoscope are also considered. Modern instruments are described. A laboratory test procedure is outlined and test results are given."
Date:
1939
Creator:
Johnson, Daniel P.
Object Type:
Report
System:
The UNT Digital Library
Airfoil section characteristics as affected by variations of the Reynolds number
Report presents the results of an investigation of a systematically chosen representative group of related airfoils conducted in the NACA variable-density wind tunnel over a wide range of Reynolds number extending well into the flight range. The tests were made to provide information from which the variations of airfoil section characteristics with changes in the Reynolds number could be inferred and methods of allowing for these variations in practice could be determined. This work is one phase of an extensive and general airfoil investigation being conducted in the variable-density tunnel and extends the previously published researches concerning airfoil characteristics as affected by variations in airfoil profile determined at a single value of the Reynolds number.
Date:
1939
Creator:
Jacobs, Eastman N. & Sherman, Albert
Object Type:
Report
System:
The UNT Digital Library
Airfoil section data obtained in the NACA variable-density tunnel as affected by support interference and other corrections
From Introduction: "The purpose of this report is to present the corrections for application to published results from the variable-density tunnel to give more reliable values of section profile-drag coefficient for airfoils of various thickness."
Date:
1939
Creator:
Jacobs, Eastman N. & Abbott, Ira H.
Object Type:
Report
System:
The UNT Digital Library
Airfoil Theory at Supersonic Speed
From Summary: "A theory is developed for the airfoil of finite span at supersonic speed analogous to the Prandtl airfoil theory of 1918-1919 for incompressible flow. In addition to the profile and induced drags, account must be taken at supersonic flow of still another drag, namely, the wave drag, which is independent of the wing aspect ratio. Both wave and induced drags are proportional to the square of the lift and depend on the Mach number, that is, the ratio of flight to sound speed. In general, in the case of supersonic flow, the drag-lift ratio is considerably less favorable than is the case for incompressible flow."
Date:
June 1939
Creator:
Schlichting, H.
Object Type:
Report
System:
The UNT Digital Library
Annual Report of the Boy Scouts of America: 1938
Annual report submitted by the Boy Scouts of America to Congress describing highlights from 1938, activities, service reports, honors, finance, organizational leadership, and other information about scouting programs.
Date:
April 3, 1939
Creator:
Boy Scouts of America
Object Type:
Report
System:
The Portal to Texas History
Annual Report of the National Advisory Committee for Aeronautics (24th). Administrative Report Including Technical Report Nos. 612 to 644
Report includes the National Advisory Committee for Aeronautics letter of submittal to the President, summaries of the committee's activities and research accomplished, bibliographies, and financial report.
Date:
1939
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Apple scab.
Discusses apple scab, its economic impact, distribution, susceptibility of various apples to the disease, and preventive measures.
Date:
1939
Creator:
Roberts, John W. (John William), 1882-1957. & Pierce, Leslie.
Object Type:
Book
System:
The UNT Digital Library
The application of basic data on planing surfaces to the design of flying-boat hulls
From Introduction: "This report is concerned with the presentation of planning data in a form that facilities direct application to the initial stage of design."
Date:
December 16, 1939
Creator:
Diehl, Walter S.
Object Type:
Report
System:
The UNT Digital Library
An approximate spin design criterion for monoplanes
"A quantitative criterion of merit has been needed to assist airplane designers to incorporate satisfactory spinning characteristics into new designs. An approximate empirical criterion, based on the projected side area and the mass distribution of the airplane, has been formulated in a recent British report. In the present paper, the British results have been analyzed and applied to American designs. A simpler design criterion based solely on the type and the dimensions of the tail, has been developed: it is useful in a rapid estimation of whether a new design is likely to comply with the minimum requirements for safety in spinning" (p. 1).
Date:
June 1939
Creator:
Seidman, Oscar & Donlan, Charles J.
Object Type:
Report
System:
The UNT Digital Library
Bean Bacterial Wilt.
Describes the signs that beans are infected with bacterial wilt, the history of the disease, where it most often occurs, and the steps that can be taken to control it.
Date:
February 1939
Creator:
Hedges, Florence
Object Type:
Book
System:
The UNT Digital Library
Blackberry growing.
Describes blackberry varieties and methods of blackberry culture.
Date:
1939
Creator:
Darrow, George M. (George McMillan), 1889-
Object Type:
Book
System:
The UNT Digital Library
The Breda Wind Tunnel
A description of the design and construction of the Breda wind tunnel. The tunnel is equipped with a two-meter throat diameter and a 310 kph velocity potential.
Date:
December 1939
Creator:
Pittoni, Mario
Object Type:
Report
System:
The UNT Digital Library
Broomcorn growing and handling.
A guide to growing and selling broomcorn, a sorghum plant used for the making of brooms and whisk brooms.
Date:
1939
Creator:
Washburn, R. S. (Raymond Secord), 1887- & Martin, John H. (John Holmes), 1893-
Object Type:
Book
System:
The UNT Digital Library
The Bud-Graft Method of Propagating Vinifera Grape Varieties on Rootstocks.
Describes a method of grafting vinifera grapes on disease-resistant rootstocks to prevent infestation by phylloxera and the root knot nematode.
Date:
1939
Creator:
Snyder, Elmer & Harmon, Frank Nelson, 1895-
Object Type:
Book
System:
The UNT Digital Library
Burnet Sheet
Topographic map of a portion of Texas from the United States Geological Survey (USGS) project. The map includes towns, historic or notable sites, bodies of water, and other geologic features. Scale 1:125000
Date:
1939
Creator:
Geological Survey (U.S.)
Object Type:
Map
System:
The Portal to Texas History
Butter Marketing by Cooperative Creameries in the Middle west
Bulletin discussing
Date:
June 1939
Creator:
Paul E. Quintus & T. G. Stitts
Object Type:
Book
System:
The UNT Digital Library
The Calculated Effect of Various Hydrodynamic and Aerodynamic Factors on the Take-Off of a Large Flying Boat
Present designs for large flying boats are characterized by high wing loading, high aspect ratio, and low parasite drag. The high wing loading results in the universal use of flaps for reducing the takeoff and landing speeds. These factors have an effect on takeoff performance and influence to a certain extent the design of the hull. An investigation was made of the influence of various factors and design parameters on the takeoff performance of a hypothetical large flying boat by means of takeoff calculations.
Date:
June 1939
Creator:
Olson, R. E. & Allison, J. M.
Object Type:
Report
System:
The UNT Digital Library
Calculation of the Aerodynamic Characteristics of Tapered Wings With Partial-Span Flaps
"Factors derived from wing theory are presented. By means of these factors, the angle of zero lift, the lift-curve slope, the pitching moment, the aerodynamic-center position, and the induced drag of tapered wings with partial-span flaps may be calculated. The factors are given for wings of aspect ratios 6 and 10 , of taper ratios from 0.25 to 1.00, and with flaps of various length. An example is presented of the method of application of the factors. Fair agreement with experimental results is shown for two wings of different taper ratio having plain flaps of various spacing" (p. 1).
Date:
January 23, 1939
Creator:
Pearson, Henry A. & Anderson, Raymond F.
Object Type:
Report
System:
The UNT Digital Library
Calculation of the Induced Efficiency of Heavily Loaded Propellers Having Infinite Number of Blades
Report presenting an approximate method of computing the induced efficiency of heavily loaded propellers in suitable form for extension to finite number of blades and a comparison of results obtained using the method with the data of the Betz-Helmbold theory for heavily loaded propellers.
Date:
January 1939
Creator:
Lösch, F.; Kramer, K. N.; Bock, G. & Nikodemus, R.
Object Type:
Report
System:
The UNT Digital Library