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Technical Report Archive and Image Library
181
National Advisory Committee for Aeronautics Collection
140
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61
USDA Farmers' Bulletins
14
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6
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3
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2
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2
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43
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25
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25
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20
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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.
Object Type:
Report
System:
The UNT Digital Library
Coal-Mine Accidents in the United States, 1930
Report compiled by the U.S. Bureau of Mines including statistics on fatal and non-fatal accidents 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:
1932
Creator:
Adams, W. W.; Geyer, L. E. & Chenoweth, L.
Object Type:
Report
System:
The UNT Digital Library
Metal-Mine Accidents in the United States During the Calendar Year 1930
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:
1932
Creator:
Adams, William W.
Object Type:
Report
System:
The UNT Digital Library
Quarry Accidents in the United States During the Calendar Year 1930
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:
1932
Creator:
Adams, William W.
Object Type:
Report
System:
The UNT Digital Library
Turbulence and Mechanism of Resistance on Spheres and Cylinders
The nature of turbulent flow through pipes and around obstacles is analyzed and illustrated by photographs of turbulence on screens and straighteners. It is shown that the reversal of flow and of the resistance law on spheres is not explainable by Prandtl's turbulence in the boundary layer. The investigation of the analogous phenomena on the cylinder yields a reversal of the total field of flow.
Date:
January 1932
Creator:
Ahlborn, F.
Object Type:
Report
System:
The UNT Digital Library
Physiography and Glacial Geology of Eastern Montana and Adjacent Areas
This is a report on the physiography and glacial geology of eastern Montana and adjacent areas.
Date:
1932
Creator:
Alden, William C.
Object Type:
Report
System:
The UNT Digital Library
Airplane Stability in Taxying
The stability analysis of an airplane while rolling is much more simplified to the extent that it can be obtained for numerical data which can be put to practical use in the design of landing gear dimensions. Every landing gear type attains to a critical ground friction coefficient that decides the beginning of instability, i.e., nosing over. This study has, in addition, a certain interest for the use of wheel brakes.
Date:
September 1932
Creator:
Anderlik, E.
Object Type:
Report
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.
Object Type:
Report
System:
The UNT Digital Library
Safety Practices in California Gold Dredging
From Introduction Purpose of Report: "The importance of safety work in connection with the operations of gold dredges assumed such proportions at one time that the State of California deemed it necessary to issue a special bulletin on this subject."
Date:
1932
Creator:
Ash, S. H. (Simon Harry), b. 1889
Object Type:
Report
System:
The UNT Digital Library
Permissible Electric Cap Lamps and Ventilation in Certain California Mines and Water-Tunnel Construction
From Introduction: "As a result of the recommendations of this committee, special studies have been made of the methane hazards incident to mining and tunneling operations in the Coast Range Mountains. These studies have resulted in the adoption of numerous safety precautionary measures; among them the use of permissible types of mining equipment, electric cap lamps, with which this deals with primarily."
Date:
1932
Creator:
Ash, S. H. (Simon Harry), b. 1889 & Rankin, J. H.
Object Type:
Report
System:
The UNT Digital Library
The Ashland Coal Field, Rosebud, Powder River, and Custer Counties, Montana
From introduction: The detailed information concerning the coal deposits of the Ashland field set forth in this report has been obtained in the course of an investigation that has been conducted both as a part of the United States Geological Survey's general systematic study of western coal lands and as an aid in the administration of the public lands. With the information obtained on the location of outcrops, the number, distribution, and thickness of coal beds, the accessibility of the coal, and the thickness of the overburden, the public lands of the region are classified as to their coal value; coal-bearing lands are differentiated from noncoal-bearing lands; and the administration of the coal-land leasing law is facilitated.
Date:
1932
Creator:
Bass, N. Wood
Object Type:
Report
System:
The UNT Digital Library
Vertical Descent of the Autogiro
The purpose of this report is to show that only part of the system of rotating blades really is in the "windmill decelerating attitude" when the profile drag is sufficiently low. This particular part receives more torque from the air loads than can be absorbed by the profile drag. As a result thereof the rotating autogiro blade, when its torque is zero, is in part a propeller which functions in the "annular vortex attitude.".
Date:
June 1932
Creator:
Bennett, J. A.
Object Type:
Report
System:
The UNT Digital Library
Reduction of Wing Lift by the Drag
Drag and loss of lift of a wing are attributable to the same cause, wake formation, thus indicating that there is some relation between both. The analysis of measurements on Joukowsky sections revealed a typical course of curves for the interdependence between drag and loss of lift. The shape of the curves apparently depends quite regularly on the mean camber and on the thickness of the profile.
Date:
August 1932
Creator:
Betz, A. & Lotz, J.
Object Type:
Report
System:
The UNT Digital Library
Application of the Theory of Free Jets
Based upon Kirchoff's theory of free jets the flow through different screen arrangements of flat plates, as chiefly encountered with turbines in the cavitation zone is defined. It is shown by experiments that these theoretical results are very well representative in most cases of the conditions of discharge from water in air and consequently by cavitation. In addition, the experiments reveal a picture of the discrepancies between the actual flow and the theory of discharge of air in air (of water in water without cavitation).
Date:
April 1932
Creator:
Betz, A. & Petersohn, E.
Object Type:
Report
System:
The UNT Digital Library
Problems Concerning the Stability and Maneuverability of Airplanes
"The stability of an airplane can be easily determined by wind-tunnel tests, especially by simple tests with models mounted wind-vane fashion. However, each stability curve plotted by this method is valid only for a certain setting of the corresponding control surface, i.e., it characterizes the stability of the airplane with the control stick in a given position. The problems thus defined are studied from the point of view of longitudinal and transverse stability. Directional stability is not included in this study" (p. 1).
Date:
March 1932
Creator:
Biche, Jean
Object Type:
Report
System:
The UNT Digital Library
Procedure of the Purchasing and Supply Departments of the Miami Copper Company, Miami, Arizona
Report issued by the U.S. Bureau of Mines discussing the purchasing procedures documented by the Miami Copper Company in Arizona. Supplies, invoices, discounts, and accounting procedures are described in detail. This report includes tables, and illustrations.
Date:
May 1932
Creator:
Bishop, Fred L. & Keller, Albert E.
Object Type:
Report
System:
The UNT Digital Library
The German Investigation of the Accident at Meopham (England)
This report is a recounting of the German investigation of the crash of a commercial Junkers F 13 ge in England. The English report is examined and compared with the German interpretation of the accident.
Date:
April 1932
Creator:
Blenk, Hermann; Hertel, Heinrich & Thalau, Karl
Object Type:
Report
System:
The UNT Digital Library
Transportation of Gasoline by Pipe Line
Technical paper issued by the Bureau of Mines over transportation of motor gasoline by pipe line. The locations and designs of the pipe lines are discussed. This paper includes tables, maps, photographs, and illustrations.
Date:
1932
Creator:
Bowie, C. P.
Object Type:
Report
System:
The UNT Digital Library
Annual Report of the Boy Scouts of America: 1931
Annual report submitted by the Boy Scouts of America to Congress describing highlights from 1931, activities, finance, honors, organizational leadership, and other information about scouting programs.
Date:
April 6, 1932
Creator:
Boy Scouts of America
Object Type:
Report
System:
The Portal to Texas History
Problems Involved in the Choice and Use of Materials in Airplane Construction
The present state of the problem of materials in airplane construction is studied on the basis of data giving the principal characteristics of different materials and showing how they affect the form of airplane parts.
Date:
February 1932
Creator:
Brenner, Paul
Object Type:
Report
System:
The UNT Digital Library
Aerodynamic characteristics of circular-arc airfoils at high speeds
From Summary: "The aerodynamic characteristics of eight circular-arc airfoils at speeds of 0.5, 0.8, 0.95, and 1.08 times the speed of sound have been determined in an open-jet air stream 2 inches in diameter, using models of 1-inch chord. The lower surface of each airfoil was plane; the upper surface was cylindrical. As compared with the measurements described in NACA-TR-319, the circular-arc airfoils at speeds of 0.95 and 1.08 times the speed of sound are more efficient than airfoils of the R. A. F. or Clark Y families. At a speed of 0.5 times the speed of sound, the thick circular-arc sections are extremely inefficient, but thin sections compare favorably with those of the R. A. F. family. A moderate round of the sharp edges changes the characteristics very little and is in many instances beneficial. The results indicate that the section of the blades of propellers intended for use at high tip-speeds should be of the circular-arc form for the outer part of the blade and should be changed gradually to the R. A. F. or Clark Y form as the hub is approached."
Date:
1932~
Creator:
Briggs, L. J. & Dryden, H. L.
Object Type:
Report
System:
The UNT Digital Library
The Effect of Humidity on Engine Power at Altitude
"From tests made in the altitude chamber of the Bureau of Standards, it was found that the effect of humidity on engine power is the same at altitudes up to 25,000 feet as at sea level. Earlier tests on automotive engines, made under sea-level conditions, showed that water vapor acts as an inert diluent, reducing engine power in proportion to the amount of vapor present. By combining the effects of atmospheric pressure, temperature, and humidity, it is shown that the indicated power obtainable from an engine is proportional to its mass rate of consumption of oxygen" (p. 523).
Date:
February 24, 1932
Creator:
Brooks, D. B. & Garlock, E. A.
Object Type:
Report
System:
The UNT Digital Library
Standards and Specifications for Nonmetallic Minerals and Their Products
Collection and publishing of the substance of the standards and specifications relating to nonmetallic minerals and manufactures thereof.
Date:
1932
Creator:
Cannon, John Q., Jr.
Object Type:
Report
System:
The UNT Digital Library
The Mechanism of Atomization Accompanying Solid Injection
"A brief historical and descriptive account of solid injection is followed by a detailed review of the available theoretical and experimental data that seem to throw light on the mechanism of this form of atomization. It is concluded that this evidence indicates that (1) the atomization accompanying solid injection occurs at the surface of the liquid after it issues as a solid stream from the orifice; and (2) that such atomization has a mechanism physically identical with the atomization which takes place in an air stream, both being due merely to the formation, at the gas-liquid interface, of fine ligaments under the influence of the relative motion of gas and liquid, and to their collapse, under the influence of surface tension, to form the drops in the spray" (p. 735).
Date:
January 6, 1932
Creator:
Castleman, R. A., Jr.
Object Type:
Report
System:
The UNT Digital Library