Collection
Technical Report Archive and Image Library
120
National Advisory Committee for Aeronautics Collection
97
USGS Topographic Map Collection
60
USDA Farmers' Bulletins
17
Government Documents A to Z Digitization Project
8
Texas State Publications
6
TRAIL Microcard Collection
1
Texas House of Representatives Journals
1
Texas Senate Journals
1
United States Experiment Station Record
1
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Serial/Series Title
NACA Technical Memorandums
50
NACA Technical Reports
27
NACA Technical Notes
19
Farmers' bulletin (United States. Dept. of Agriculture)
17
United States Bureau of Mines Reports
16
30 Minute Series
6
National Bureau of Standards Reports
6
15 Minute Series (Topographic)
5
Bulletin (Texas. Department of Agriculture)
3
National Bureau of Standards circular
3
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207 Matching Results
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Air forces on airfoils moving faster than sound
We are undertaking the task of computing the air forces on a slightly cambered airfoil in the absence of friction and with an infinite aspect ratio. We also assume in advance that the leading edge is very sharp and that its tangent lies in the direction of motion.
Date:
June 1925
Creator:
Ackeret, J.
Object Type:
Report
System:
The UNT Digital Library
Recent experiments at the Gottingen Aerodynamic Institute
This report presents the results of various experiments carried out at the Gottingen Aerodynamic Institute. These include: experiments with Joukowski wing profiles; experiments on an airplane model with a built-in motor and functioning propeller; and the rotating cylinder (Magnus Effect).
Date:
July 1925
Creator:
Ackeret, J.
Object Type:
Report
System:
The UNT Digital Library
Coal-Mine Fatalities in the United States, 1924
Report compiled by the U.S. Bureau of Mines including statistics on fatalities in coal mines located in the United States as well as data regarding the various operations (e.g., number of miners employed and average production). The information is organized into tables for comparison and the text draws some overall conclusions in the summary.
Date:
1925
Creator:
Adams, William W.
Object Type:
Report
System:
The UNT Digital Library
Metal-Mine Accidents in the United States During the Calendar Year 1923
Report issued by the U.S. Bureau of Mines covering accidents that happened in metal mines located in the United States including statistics for injuries, fatalities, kinds and causes of accidents, and operational data, such as number of mine workers and shifts worked.
Date:
1925
Creator:
Adams, William W.
Object Type:
Report
System:
The UNT Digital Library
Quarry Accidents in the United States During the Calendar Year 1923
Report published by the U.S. Bureau of Mines which is a compilation of accidents in quarries located in the United States with data regarding the number and kinds of accidents as well as information about the mining operations (e.g., number of men employed, kinds of quarries, amount of work performed, etc.).
Date:
1925
Creator:
Adams, William W.
Object Type:
Report
System:
The UNT Digital Library
Laws relating to fur animals for the season 1925-26.
Describes the federal laws and regulations regarding fur animals and the fur trade in North America.
Date:
September 1925
Creator:
Ashbrook, F. G. (Frank Getz), 1892- & Earnshaw, Frank L.
Object Type:
Book
System:
The UNT Digital Library
Strength Calculations on Airplanes
"Every strength calculation, including those on airplanes, must be preceded by a determination of the forces to be taken into account. In the following discussion, it will be assumed that the magnitudes of these forces are known and that it is only a question of how, on the basis of these known forces, to meet the prescribed conditions on the one hand and the practical requirements on the other" (p. 1).
Date:
December 1925
Creator:
Baumann, A.
Object Type:
Report
System:
The UNT Digital Library
Tomatoes for canning and manufacturing.
Describes the steps necessary for successfully producing tomatoes for canning.
Date:
November 1925
Creator:
Beattie, James H. (James Herbert), b. 1882
Object Type:
Book
System:
The UNT Digital Library
Astronomical Methods in Aerial Navigation
The astronomical method of determining position is universally used in marine navigation and may also be of service in aerial navigation. The practical application of the method, however, must be modified and adapted to conform to the requirements of aviation. Much of this work of adaptation has already been accomplished, but being scattered through various technical journals in a number of languages, is not readily available. This report is for the purpose of collecting under one cover such previous work as appears to be of value to the aerial navigator, comparing instruments and methods, indicating the best practice, and suggesting future developments.
Date:
1925
Creator:
Beij, K. Hilding
Object Type:
Report
System:
The UNT Digital Library
The "Magnus Effect" - the Principle of the Flettner Rotor
The phenomenon of the Magnus effect consists in the fact that a revolving body moving relatively to the surrounding fluid (air) is subjected not only to drag (i.e., a force acting in a direction opposite to that of the direction of motion), but also to a lift.
Date:
April 1925
Creator:
Betz, A.
Object Type:
Report
System:
The UNT Digital Library
A Method for the Direct Determination of Wing-Section Drag
In order that the method may be more easily understood, we will first consider the simpler case when there is no lift, but only drag, and when the streamlines at the measuring point behind the obstacle are nearly parallel. Moreover, the flow is assumed not to deviate much from the two-dimensional flow.
Date:
November 1925
Creator:
Betz, A.
Object Type:
Report
System:
The UNT Digital Library
Effect of Speed on Economy of Airship Traffic
The economic costs and benefits of speed on airship traffic are calculated and different factors are considered.
Date:
February 1925
Creator:
Bleistein, W.
Object Type:
Report
System:
The UNT Digital Library
[Memorandums on the Subject of Joukowski Wings]
In the first article, in connection with a lecture on the hydrodynamic basis of flight and the potential flow about a Joukowski wing, the pressure distribution on several wings is computed and plotted. The diagrams of the pressure distributions are presented accompanied with a qualitative discussion of the pressure distribution. In the second article, the the cross-sectional outline (or profile) a Joukowski wing are plotted.
Date:
October 1925
Creator:
Blumenthal, Otto & Trefftz, E.
Object Type:
Report
System:
The UNT Digital Library
Pressure Distribution on Joukowski Wings
The hydrodynamics and mathematical models as applied to the potential flow about a Joukowski wing are presented.
Date:
October 1925
Creator:
Blumenthal, Otto & Trefftz, E.
Object Type:
Report
System:
The UNT Digital Library
Sources of Limestone, Gypsum, and Anhydrite for Dusting Coal Mines to Prevent Explosions
From Preface: "The writer began testing the rock-dusting method for the Bureau of Mines at the Pittsburgh gallery in 1909, and later continued such testing in the bureau's experimental mine, with favorable results. Beginning in 1911 the bureau issued reports recommending rock dusting as alternative to watering."
Date:
1925
Creator:
Bowles, Oliver
Object Type:
Report
System:
The UNT Digital Library
Aerodynamic characteristics of airfoils at high speeds
From Summary: "This report deals with an experimental investigation of the aerodynamical characteristics of airfoils at high speeds. Lift, drag, and center of pressure measurements were made on six airfoils of the type used by the air service in propeller design, at speeds ranging from 550 to 1,000 feet per second. The results show a definite limit to the speed at which airfoils may efficiently be used to produce lift, the lift coefficient decreasing and the drag coefficient increasing as the speed approaches the speed of sound. The change in lift coefficient is large for thick airfoil sections (camber ratio 0.14 to 0.20) and for high angles of attack. The change is not marked for thin sections (camber ratio 0.10) at low angles of attack, for the speed range employed. At high speeds the center of pressure moves back toward the trailing edge of the airfoil as the speed increases. The results indicate that the use of tip speeds approaching the speed of sound for propellers of customary design involves a serious loss in efficiency."
Date:
1925~
Creator:
Briggs, L. J.; Hull, G. F. & Dryden, H. L.
Object Type:
Report
System:
The UNT Digital Library
Royal Aero Club Light Aeroplane Competition
Memorandum describing the results of the Royal Aero Club light airplane competition and some of the history surrounding the event. A list of the planes that participated and an analysis of the performance of the various aircraft are provided.
Date:
January 1925
Creator:
Buchanan, J. S.
Object Type:
Report
System:
The UNT Digital Library
The Lytton Springs Oil Field
Report published in a scientific bulletin, describing the Lytton Springs oil fields.
Date:
October 15, 1925
Creator:
Bybee, H. P. & Short, R. T.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Motor-Vehicle Headlighting
A report on the necessity of improved motor-vehicle lighting.
Date:
August 5, 1925
Creator:
Carlson, R. E.
Object Type:
Report
System:
The UNT Digital Library
Motor-Vehicle Headlighting
Report issued by the Bureau of Standards discussing the improved illumination of night-time driving with the use of vehicle head-lighting. Methods of construction and adjustment information are presented. This report includes tables, illustrations, and photographs.
Date:
1925
Creator:
Carlson, R. E.
Object Type:
Report
System:
The UNT Digital Library
The Treatment of Manganese-Silver Ores
Report presenting studies regarding the treatment of manganese-silver ores.
Date:
1925
Creator:
Clevenger, Galen H. & Caron, Martinus H.
Object Type:
Report
System:
The UNT Digital Library
Investigation of Slipstream Velocity
"These experiments were made at the request of the Bureau of Aeronautics, Navy Department, to investigate the velocity of the air in the slipstream in horizontal and climbing flight to determine the form of expression giving the slipstream velocity in terms of the airspeed of the airplane. The method used consisted in flying the airplane both on a level course and in climb at full throttle and measuring the slipstream velocity at seven points in the slipstream for the whole speed range of the airplane in both conditions. In general the results show that for both condition, horizontal and climbing flights, the slipstream velocity v subscript 3 and airspeed v can be represented by straight lines and consequently the equations are of the form: v subscript s = mv+b where m and b are constant" (p. 199).
Date:
January 1925
Creator:
Crowley, J. W., Jr.
Object Type:
Report
System:
The UNT Digital Library
Determination of Turning Characteristics of an Airship by Means of a Camera Obscura
This investigation was carried out by the National Advisory Committee at Langley Field for the purpose of determining the adaptability of the camera obscura to the securing of turning characteristics of airships, and also of obtaining some of those characteristics of the C-7 airship. The method consisted in flying the airship in circling flight over a camera obscura and photographing it at known time intervals. The results show that the method used is highly satisfactory and that for the particular maneuver employed the turning diameter is 1,240 feet, corresponding to a turning coefficient of 6.4, and that the position of zero angle of yaw is at the nose of the airship.
Date:
1925
Creator:
Crowley, J. W., Jr. & Freeman, R. G.
Object Type:
Report
System:
The UNT Digital Library
Characteristics of a single float seaplane during take-off
At the request of the Bureau of Aeronautics, Navy Department, the National Advisory Committee for Aeronautics at Langley Field is investigating the get-away characteristics of an N-9H, a DT-2, and an F-5l, as representing, respectively, a single float, a double float, and a boat type of seaplane. This report covers the investigation conducted on the N-9H. The results show that a single float seaplane trims aft in taking off. Until a planing condition is reached the angle of attack is about 15 degrees and is only slightly affected by controls. When planing it seeks a lower angle, but is controllable through a widening range, until at the take-off it is possible to obtain angles of 8 degrees to 15 degrees with corresponding speeds of 53 to 41 M. P. H. or about 40 per cent of the speed range. The point of greatest resistance occurs at about the highest angle of a pontoon planing angle of 9 1/2 degrees and at a water speed of 24 M. P. H.
Date:
January 1925
Creator:
Crowley, J. W., Jr. & Ronan, K. M.
Object Type:
Report
System:
The UNT Digital Library