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Special Studies in Electrolysis Mitigation: 4. A Preliminary Report on Electrolysis Mitigation in Elyria, Ohio, with Recommendations for Mitigation

Description: Technical paper issued by the Bureau of Standards over surveys conducted on the electrical conditions of railway tracks in Elyria, Ohio. The results of the surveys are presented and discussed. This paper includes tables, maps, and illustrations.
Date: January 22, 1916
Creator: McCollum, Burton & Logan, K. H.
Item Type: Refine your search to only Report
open access

An Apparatus for Measuring the Relative Wear of Sole Leathers, and the Results Obtained with Leather from Different Parts of a Hide

Description: Technical paper issued by the Bureau of Standards over studies conducted on the quality of sole leather. As stated in the introduction, "the development of a simple method for quickly determining the durability of sole leather seemed desirable, and this paper discusses a laboratory apparatus designed for this purpose and also presents the results of tests made to date to determine the relative wear of leather from different parts of the hide" (p. 3). This paper includes illustrations, and photo… more
Date: November 22, 1919
Creator: Hart, R. W. & Bowker, R. C.
Item Type: Refine your search to only Report
open access

Radio-Frequency Resistance and Inductance of Coils Used in Broadcast Reception

Description: Technical paper issued by the Bureau of Standards over radio-frequency resistance in radio reception. As stated in the introduction, "the purpose of this paper is to present data on the radio-frequency resistance and inductance of coils within the range of frequencies used in radiotelephone broadcasting" (p. 651). This paper includes tables, and illustrations.
Date: October 22, 1925
Creator: Hund, August & De Groot, H. B.
Item Type: Refine your search to only Report
open access

The Geology of Denton County

Description: Book that discusses the geology of Denton County, Texas. Topics include the county's physiographic subdivisions, geologic formations, and economically valuable geological features.
Date: November 22, 1925
Creator: Winton, W. M. (Will McClain), 1885-1960
Item Type: Refine your search to only Book
open access

Water-pressure distribution on seaplane float

Description: The investigation presented in this report was conducted for the purpose of determining the distribution and magnitude of water pressures likely to be experienced on seaplane hulls in service. It consisted of the development and construction of apparatus for recording water pressures lasting one one-hundredth second or longer and of flight tests to determine the water pressures on a UO-1 seaplane float under various conditions of taxiing, taking off, and landing. The apparatus developed was fou… more
Date: December 22, 1927
Creator: Thompson, F. L.
Item Type: Refine your search to only Report
open access

Flight tests of the drag and torque of the propeller in terminal-velocity dives

Description: From Summary: "The drag and torque of a controllable propeller at various blade-angle settings, and under various diving conditions, were measured by indirect method on F6C-4 airplane in flight. The object of these tests were (1) to provide data on which calculations of the terminal velocity with a throttled engine and the accompanying engine speed could be based and (2) to determine the possibility of utilizing the propeller as an air brake to reduce the terminal velocity. The data obtained we… more
Date: August 22, 1933
Creator: Rhode, Richard V. & Pearson, Henry A.
Item Type: Refine your search to only Report
open access

On the Theory of Laminar Boundary Layers Involving Separation

Description: "This paper presents a mathematical discussion of the laminar boundary layer, which was developed with a view of facilitating the investigation of those boundary layers in particular for which the phenomenon of separation occurs. The treatment starts with a slight modification of the form of the boundary layer equation first published by Von Mises. Two approximate solutions of this equation are found, one of which is exact at the outer edge of the boundary layer while the other is exact at the … more
Date: May 22, 1934
Creator: von Karman, T. & Millikan, C. B.
Item Type: Refine your search to only Report
open access

The effect of turbulence on the drag of flat plates

Description: "In determining the effect of turbulence on the forces exerted on bodies in the air stream of a wind tunnel, it is commonly assumed that the indications of the standard Pitot-static tube used to determine the air speed are not dependent on the turbulence. To investigate the truth of this assumption, the drag of a normally exposed flat plate, the difference in pressure between the front and rear of a thin circular disk, the rate of rotation of a vane anemometer, and the pressure developed by a s… more
Date: June 22, 1935
Creator: Schubauer, G. B. & Dryden, H. L.
Item Type: Refine your search to only Report
open access

Aircraft Accidents: Methods of Analysis

Description: This report is a revision of NACA-TR-357. It was prepared by the Committee on Aircraft Accidents. The purpose of this report is to provide a basis for the classification and comparison of aircraft accidents, both civil and military.
Date: June 22, 1936
Creator: Committee on Aircraft Accidents
Item Type: Refine your search to only Report
open access

Mechanism of flutter: A theoretical and experimental investigation of the flutter problem

Description: From Summary: "The results of the basic flutter theory originally devised in 1934 and published as NACA Technical Report no. 496 are presented in a simpler and more complete form convenient for further studies. The paper attempts to facilitate the judgement of flutter problems by a systematic survey of the theoretical effects of the various parameters. A large number of experiments were conducted on cantilever wings, with and without ailerons, in the NACA high-speed wind tunnel for the purpose … more
Date: September 22, 1938
Creator: Theodorsen, Theodore & Garrick, I. E.
Item Type: Refine your search to only Report
open access

Tensile Elastic Properties of 18:8 Chromium-Nickel Steel as Affected by Plastic Deformation

Description: "The relationship between stress and strain, and between stress and permanent set, for 18:8 alloy as affected by prior plastic deformation is discussed. Hysteresis and creep and their effects on the stress-strain and stress-set curves are also considered, as well as the influence of duration of the rest interval after cold work and the influence of plastic deformation on proof stresses, on the modulus of elasticity at zero stress, and on the curvature of the stress-strain line. A constant (c su… more
Date: November 22, 1938
Creator: McAdam, D. J., Jr. & Mebs, R. W.
Item Type: Refine your search to only Report
open access

An investigation of the drag of windshields in the 8-foot high-speed wind tunnel

Description: Report presents the results of tests made to determine the drag of closed-cockpit and transport-type windshields. The tests were made at speeds corresponding to a Mach number range of approximately 0.25 to 0.58 in the NACA 8-foot high-speed wind tunnel. This speed range corresponds to a test Reynolds number range of 2,510,000 to 4,830,000 based on the mean aerodynamic chord of the full-span model (17.29 in.). The shapes of the windshield proper, the hood, and the tail fairing were systematicall… more
Date: May 22, 1939
Creator: Robinson, Russell G. & Delano, James B.
Item Type: Refine your search to only Report
open access

The problem of cooling an air-cooled cylinder on an aircraft engine

Description: An analysis of the cooling problem has been to show by what means the cooling of an air-cooled aircraft engine may be improved. Each means of improving cooling is analyzed on the basis of effectiveness in cooling with respect to power for cooling. The altitude problem is analyzed for both supercharged and unsupercharged engines. The case of ground cooling is also discussed. The heat-transfer process from the hot gases to the cylinder wall is discussed on the basis of the fundamentals of heat tr… more
Date: April 22, 1940
Creator: Brevoort, M. J. & Joyner, U. T.
Item Type: Refine your search to only Report
open access

Methods of analyzing wind-tunnel data for dynamic flight conditions

Description: The effects of power on the stability and the control characteristics of an airplane are discussed and methods of analysis are given for evaluating certain dynamic characteristics of the airplane that are not directly discernible from wind tunnel tests alone. Data are presented to show how the characteristics of a model tested in a wind tunnel are affected by power. The response of an airplane to a rolling and a yawing disturbance is discussed, particularly in regard to changes in wing dihedral… more
Date: July 22, 1941
Creator: Donlan, C. J. & Recant, I. G.
Item Type: Refine your search to only Report
open access

Test of single-stage axial-flow fan

Description: "A single-stage axial fan was built and tested in the shop of the propeller-research tunnel of the NACA. The fan comprised a simple 24-blade rotor having a diameter of 21 inches and a solidity of 0.86 and a set of 37 contravanes having a solidity of 1.33. The rotor was driven by a 25-horsepower motor capable of rotating at a speed of 3600 r.p.m. The fan was tested for volume, pressure, and efficiency over a range of delivery pressures and volumes for a wide range of contravane and blade-angle s… more
Date: September 22, 1941
Creator: Bell, E. Barton
Item Type: Refine your search to only Report

Newsmap. Monday, June 22, 1942 : week of June 12 to June 19

Description: Front: Text describes action on various war fronts. Large world map is keyed to text and illustrates time zones around the world. Includes inset maps: Strategic distances in the North Pacific ; Attu Island ; the Rat Island group ; Jap drives [in China]. Photographs: Jungle fighting; Battle of Carriers; Planes that hit the enemy; Swimming through flames; Tomahawk takes it. Back: "These are some of the weapons which checked Hitler's armies." Includes photographs: Moving in column to the atta… more
Date: June 22, 1942
Creator: [United States.] Army Orientation Course.
Item Type: Refine your search to only Poster
open access

Aircraft woodwork.

Description: Discusses woodworking in aircraft manufacturing in general, and in detail the characteristics of wood, the glue and hardware necessary, hand tools and machines, as well as repair of the aircraft.
Date: December 22, 1942
Creator: United States. War Department.
Item Type: Refine your search to only Book

Newsmap. Monday, February 22, 1943 : week of February 12 to February 19, 180th week of the war, 62nd week of U.S. participation

Description: Front: Text describes action on various war fronts: Russia, New Guinea, Solomons, China, Pacific and Far East, French fleet, North Africa. Large world map is keyed to text. Includes table: Great Circle Distances in Statute Miles. Inset maps show Tunisia and Russia. Includes 8 photographs. Back: Poster provides recognition cues and front and profile drawings of Allied and Axis light tanks and self-propelled weapons. Includes range scale.
Date: February 22, 1943
Creator: [United States.] Army Orientation Course.
Item Type: Refine your search to only Poster

Newsmap. Monday, March 22, 1943 : week of March 12 to March 19, 184th week of the war, 66th week of U.S. participation

Description: Front: Text describes action on various war fronts: Tunisia, Aleutians, New Guinea, Solomons, Pacific and Far East, Burma-China, Russia. Large world map is keyed to text and illustrates time zones around the world. Inset maps show northern Tunisia, and along the Russian front. Includes photographs: Pulling together for victory [Chinese laborers flatten a runway with a heavy roller]; Sgt. Robert Wilson of Wichita, Kansas rides a wheelbarrow taxicab; Yanks in the Far East care for Burmese orph… more
Date: March 22, 1943
Creator: [United States.] Army Orientation Course.
Item Type: Refine your search to only Poster
open access

Effect of Temperature on the Resonance Absorption of Neutrons by Uranium

Description: The resonance absorption of uranium for neutrons has been investigated between 20 degree C and 1000 degree C. Experiments were caried out on both UO2, density 4.63, and metal. The resonance activity was measured with respect to that of an iodine monitor at several different temperatures and the ratio of activity at temperature T to that at 20 degree C was determined. The increase in activity is 0.9 per cent per 100 degree C for the oxide and 1.1 percent per 100 degree C for the metal. The perio… more
Date: April 22, 1943
Creator: Mitchell, Allan C. G. (Allan Charles Gray), 1902-; Slotin, Louis; Marshall, John; Nedzel, V. A.; Brown, L. J. & Pruett, John R.
Item Type: Refine your search to only Report

Newsmap. Monday, November 22, 1943 : week of November 11 to November 18, 219th week of the war, 101st week of U.S. participation

Description: Text describes action on various war fronts: Eastern front, Air offensive, Italy, Aegean Sea, Southwest Pacific, Losses. Maps: Battle area on the Eastern front, map showing main railways and international boundaries in Europe, Turkey and northern Tunisia. Photographs: Capt. Herman Bottcher of San Francisco receives the Distinguished Service Cross from Maj. Gen. W. H. Gill; British Eighth Army Tommy sets up quarters in an empty wine barrel with a pillow and bedspread near the Termoli front in… more
Date: November 22, 1943
Creator: [United States.] Army Orientation Course.
Item Type: Refine your search to only Poster
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