Resource Type
Partner
Collection
Technical Report Archive and Image Library
176
National Advisory Committee for Aeronautics Collection
151
Texas State Publications
15
Harris and Eliza Kempner
2
Office of Scientific & Technical Information Technical Reports
2
Boy and Girl Scout Annual Reports
1
Docs In The News
1
Federal Communications Reports
1
Stillwater History Museum at the Sheerar, Stillwater, Oklahoma
1
Serial/Series Title
NACA Technical Notes
46
NACA Technical Memorandums
41
NACA Technical Reports
27
NACA Wartime Reports
19
NACA Special Reports
16
NACA Advanced Confidential Reports
15
United States Bureau of Mines Reports
14
Monthly Report of the Attorney General of the State of Texas
9
United States Geological Survey Reports
7
NACA Memorandum Reports
4
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Year
Month
Language
198 Matching Results
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Reconnaissance of Gold-Mining Districts in the Black Hills, South Dakota
From Introduction: "The principal purpose of the survey is to make public information not generally known concerning the gold deposits in the Black Hills. Operating mines, particularly the Homestake, are discussed only briefly."
Date:
1940
Creator:
Allsman, Paul T.
System:
The UNT Digital Library
Fire-Retardant Treatments of Liquid-Oxygen Explosives
From Introduction Present Investigation: "The scope of the investigation was limited to study of the effects of fire-retardant treatments on the resistance to ignition, physical characteristics, and practical hazards of handling the liquid-oxygen explosive prepared from the granular carbonaceous absorbent mentioned, from wrappers of a triple-filled canvas, and from a liquid oxygen of standard high purity."
Date:
1940
Creator:
Denues, A. R. T.
System:
The UNT Digital Library
The Joseph A. Holmes Safety Association and Its Awards
Report discussing history and purpose of Joseph A. Holmes Safety Association along with describing the awards issued by the association.
Date:
1940
Creator:
Harrington, D.; Pedlow, Louise & Brown, Anna P.
System:
The UNT Digital Library
Mechanical Shoveling in Underground Metal Mines
From Scope of Bulletin: "The object of the current bulletin is to present recent data on mechanical shoveling in underground metal mines and in selected nonmetal mines. This bulletin supplements the 1924 edition, but the main discussion covers mechanical shoveling only, because most of the new material relates to equipment recently developed, to improved technique in loading, and ti changes in loading practice in certain mining districts."
Date:
1940
Creator:
Mosier, McHenry & Steinmesch, J. H.
System:
The UNT Digital Library
Coal-Mine Accidents in the United States, 1937
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:
1940
Creator:
Adams, William W.; Geyer, L. E. & Parry, M. G.
System:
The UNT Digital Library
Mechanical Concentration of Gases
From Introduction: "This bulletin deals with a new mechanical means of attacking the problem of separation. Although it is improbable that any one type of separation could hope to find universal application, the method described is to be regarded as an alternative to conventional means that has attractive possibilities in certain instances."
Date:
1940
Creator:
Maier, C. G.
System:
The UNT Digital Library
Quarry Accidents in the United States During the Calendar Year 1938
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:
1940
Creator:
Adams, William W. & Wrenn, Virginia E.
System:
The UNT Digital Library
United States Earthquakes 1940
Report discussing earthquake activity in the United States during 1940. The report is broken down by regions and has sections for specific earthquakes.
Date:
1940
Creator:
unknown
System:
The UNT Digital Library
Sound Insulation of Wall and Floor Constructions
Report presenting the results of sound-transmission measurements made on a number of types of sound insulating construction.
Date:
1940
Creator:
United States. National Bureau of Standards.
System:
The UNT Digital Library
An Investigation of Sheet-Stiffener Panels Subjected to Compression Loads With Particular Reference to Torsionally Weak Stiffeners
"A total of 183 panel specimens of 24ST aluminum alloy with nominal thickness of 0.020, and 0.040 inch with extruded bulb-angle sections of 12 shapes spaced 4 and 5 inches as stiffeners were tested to obtain the buckling stress and the amplitude of the maximum wave when buckled. Bulb angles from 3 to 27 1/2 inches long were tested as pin-end columns. The experimental data are presented as stress-strain and column curves and in tabular form" (p. 1).
Date:
February 1940
Creator:
Dunn, Louis G.
System:
The UNT Digital Library
Measured Moments of Inertia of 32 Airplanes
"A compilation of the experimentally determined moments of inertia of 32 airplanes is presented. The measurements were obtained at the laboratories of the NACA by means of a pendulum method. The airplanes tested are representative of several types of aircraft of gross weight less than 10,000 pounds. The results are presented in coefficient as well as in dimensional form. An elementary analysis of the data disclosed the possibility of grouping the results according to wing type of the airplane, as low-wing monoplanes, parasol and high-wing monoplanes, and biplanes" (p. 1).
Date:
October 1940
Creator:
Gracey, William
System:
The UNT Digital Library
Measurement of the Forces Acting on Gliders in Towed Flight
"The magnitude, the direction, and the fluctuations of tow forces exerted upon gliders by towing them aloft behind an automobile were measured under a variety of conditions covering a range from gentle to severe types of operation. For these tests, the glider towing force did not exceed 1.6 of the gross weight of the glider. V-G records obtained during the towed-flight period as well as during the subsequent return glide to earth showed accelerations in the range from 3 to -1 g. The results of preliminary airplane tow tests are also presented" (p. 1).
Date:
February 1940
Creator:
Klemperer, W. B.
System:
The UNT Digital Library
An Investigation of the Prevention of Ice on the Airplane Windshield
"An investigation of three methods for the prevention and the removal of ice on an airplane windshield has been completed. The methods were: electric heating; hot-air heating; and an alcohol-dispensing, rotating wiper blade. The results showed that vision through the airplane windshield could be maintained during severe icing conditions by the use of heat" (p. 1).
Date:
March 1940
Creator:
Rodert, Lewis A.
System:
The UNT Digital Library
The frequencies of cantilever wings in beam and torsional vibrations
From Summary: "Methods are described for calculating the period and frequency of vibration of cantilever wings and similar structures in which the weight and moment of inertia vary along the span. Both the beam and torsional frequencies may be calculated by these methods. The procedure is illustrated by examples."
Date:
January 1940
Creator:
Burgess, C. P.
System:
The UNT Digital Library
Propeller Rotation Noise Due to Torque and Thrust
"Sound pressure of the first four harmonics of rotation from a full-scale two-blade propeller were measured and are compared with values calculated from theory. The comparison is made (1) for the space distribution with constant tip speed and (2) for fixed space angles with variable tip speed. A relation for rotation noise from an element of radius developed by Gutin is given showing the effect of number of blades on the rotation noise" (p. 1).
Date:
January 1940
Creator:
Deming, Arthur F.
System:
The UNT Digital Library
Notes on the stalling of vertical tail surfaces and on fin design
From Summary: "A discussion is given of the important aspects of the stalling of vertical tail surfaces. The type of instability encountered is described and the possibilities of inadvertent occurrence are noted. The influence of directional flight tests on the behavior of a airplane when the tail stall takes place is discussed. In this connection, flight tests of a twin-engine airplane in which the vertical fin area was increased are cited."
Date:
October 1940
Creator:
Thompson, F. L. & Gilruth, R. R.
System:
The UNT Digital Library
Principles, Practices, and Progress of Noise Reduction in Airplanes
Note presenting the body of knowledge that has been accumulated in the field of noise reduction in aircraft. Special attention is paid to effective soundproofing schemes.
Date:
January 1940
Creator:
London, Albert
System:
The UNT Digital Library
A new method of studying the flow of the water along the bottom of a model of a flying-boat hull
A new method of studying the flow of the water along the bottom of a model of a flying-boat hull is described. In this method, the model is fitted with a transparent bottom and is divided down the center line by a bulkhead. The flow is observed and photographed through one-half of the model by means of the diffused illumination from a battery of lamps contained in the other half of the model. Photographs of the flow, particularly of the changes that occur when the step ventilates, are shown. The results of the present investigation indicate that the method has considerable promise, chiefly in connection with motion-picture studies.
Date:
February 1940
Creator:
Ward, Kenneth E.
System:
The UNT Digital Library
A Generalized Vortex Theory of the Screw Propeller and Its Application
"The vortex theory as presented by the author in earlier papers has been extended to permit the solution of the following problems: (1) the investigation of the relation between thrusts and torque distribution and energy loss as given by the induction of helical vortex sheets and by the parasite drag; (2) the checking of the theorem of Betz of the rigidly behaving helical vortex sheet of minimum induced energy loss; (3) the extension of the theory of the screw propeller of minimum energy loss for the inclusion of parasite-drag distribution along the blades" (p. 1).
Date:
February 1940
Creator:
Reissner, Hans
System:
The UNT Digital Library
Damping formulas and experimental values of damping in flutter models
The problem of determining values of structural damping for use in flutter calculations is discussed. The concept of equivalent viscous damping is reviewed and its relation to the structural damping coefficient g introduced in NACA Technical Report No. 685 is shown. The theory of normal modes is reviewed and a number of methods are described for separating the motions associated with different modes. Equations are developed for use in evaluating the damping parameters from experimental data. Experimental results of measurements of damping in several flutter models are presented.
Date:
February 1940
Creator:
Coleman, Robert P.
System:
The UNT Digital Library
Wind-tunnel investigation of an NACA 23030 airfoil with various arrangements of slotted flaps
An investigation was made of a large-chord NACA 23030 airfoil with a 40- and a 25.66 percent-chord slotted flap to determine the section aerodynamic characteristics of the airfoil affected by flap chord, slot shape, flap position, and flap deflection. The flap positions for maximum lift, the position for minimum drag at moderate and high lift coefficients, and the complete section aerodynamic characteristics of selected optimum arrangements are given. Envelope polar of various flap arrangements are included. The relative merits of slotted flaps of different chords on the NACA 23030 airfoil are discussed, and a comparison is made of each flap size with a corresponding flap size on the NACA 23021 and 23012 airfoils.
Date:
March 1940
Creator:
Recant, I. G.
System:
The UNT Digital Library
The Effects of Piston-Head Shape, Cylinder-Head Shape, and Exhaust Restriction, on the Performance of a Piston-Ported Two-Stroke Cylinder
Report presenting testing of a model of the two-stroke engine described in NACA Technical Note No. 674 for the purpose of observing the scavenging-air flow obtained with various inlet-port arrangements. Three types of cylinder head were tried with the round-edge piston in the engine. Results regarding the effect of port arrangement, pistons, cylinder-head shapes, effect of swirl, and exhaust restrictions are provided.
Date:
March 1940
Creator:
Rogowski, A. R.; Bouchard, C. L. & Taylor, C. Fayette
System:
The UNT Digital Library
Wind tunnel tests of an NACA 23021 airfoil equipped with a slotted extensible and a plain extensible flap
"An investigation has been made in the NACA 7- by 10-foot wind tunnel of a large chord NACA 23021 airfoil equipped with two arrangements of a completely extended 15 percent chord extensible flap. One of the flaps had a faired juncture, without a gap; the other was provided with a slot between the trailing edge of the airfoil and the nose of the flap. The results showed that the basic airfoil gave the lowest profile-drag coefficients over the low lift range, the airfoil with the plain extensible flap gave the lowest profile-drag coefficients over the moderate lift range, and the airfoil with the slotted extensible flap gave the lowest profile-drag coefficients over the high lift range" (p. 1).
Date:
November 1940
Creator:
Swanson, Robert S. & Harris, Thomas A.
System:
The UNT Digital Library
A study of unsymmetrical-loading conditions
From Summary: "The force variation along the wing span under combined normal and angular accelerations is considered. Non dimensional curves of section load, shear, and moment are given for: (1) the air load that produces a normal acceleration; (2) the accompanying wing weight and normal inertia loads; (3) aileron and gust air loads that produce angular acceleration; (4) the angular inertia load of the wing. The required aerodynamic load distributions have been obtained by use of wing theory, and the wing inertia distributions are based on an analysis of wing-weight data. Several examples are included to illustrate the effect of wing taper and aileron span on the total shears and moments at any section along the span."
Date:
April 1940
Creator:
Pearson, Henry A.
System:
The UNT Digital Library