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A Review of the American Moles

Description: Discusses habits; economic status; characteristics and development of young; pelages and molts; and geographic, individual, sexual, and age variation. Describes subfamilies, history, and generic names of the family Talpidae. Describes, lists locations, and provides a key for genera, species and subspecies.
Date: September 30, 1915
Creator: Jackson, Hartley H. T.
Item Type: Refine your search to only Report
open access

A Preliminary Investigation of Supercharging an Air-Cooled Engine in Flight

Description: "This report presents the results of preliminary tests made on the effects of supercharging an air-cooled engine under airplane flight conditions. Service training airplanes were used in the investigation equipped with production types of Wright J engines. A N.A.C.A. Roots type supercharger was driven from the rear of the engine. In addition to measuring those quantities that would enable the determination of the climb performance, measurements were made of the cylinder-head temperatures and th… more
Date: July 30, 1927
Creator: Ware, Marsden & Schey, Oscar W.
Item Type: Refine your search to only Report
open access

The Measurement of Maximum Cylinder Pressures

Description: "The work presented in this report was undertaken at the Langley Memorial Aeronautical Laboratory of the National Advisory Committee for Aeronautics to determine a suitable method for measuring the maximum pressures occurring in aircraft engine cylinders. The study and development of instruments for the measurement of maximum cylinder pressures has been conducted in connection with carburetor and oil engine investigations on a single cylinder aircraft-type engine. Five maximum cylinder-pressure… more
Date: March 30, 1928
Creator: Hicks, Chester W.
Item Type: Refine your search to only Report
open access

The quiescent-chamber type compression-ignition engine

Description: Report presents the results of performance tests of a single-cylinder 4-stroke-cycle compression-ignition engine having a vertical disk form of combustion chamber without air flow. The number, size, and direction of the orifices of the fuel-injection nozzles used were independently varied. A table and graphs are presented showing the performance of the engine with different nozzles; results of tests at different compression ratios, boost pressures, and coolant temperatures are also included.
Date: April 30, 1936
Creator: Foster, H. H.
Item Type: Refine your search to only Report
open access

The Column Strength of Two Extruded Aluminum-Alloy H-Sections

Description: "Extruded aluminum-alloy members of various cross sections are used in aircraft as compression members either singly or as stiffeners for aluminum-alloy sheet. In order to design such members, it is necessary to know their column strength or, in the case of stiffeners, the value of the double modulus, which is best obtained for practical purposes from column tests. Column tests made on two extruded h-sections are described, and column formulas and formulas for the ratio of the double modulus to… more
Date: September 30, 1938
Creator: Osgood, William R. & Holt, Marshall
Item Type: Refine your search to only Report
open access

High-Speed Tests of Conventional Radial-Engine Cowlings

Description: The drag characteristics of eight radial-engine cowlings have been determined over a wide speed range in the NACA 8-foot high-speed wind tunnel. The pressure distribution over all cowlings was measured, to and above the speed of the compressibility burble, as an aid in interpreting the force tests. One-fifth-scale models of radial-engine cowlings on a wing-nacelle combination were used in the tests.
Date: March 30, 1939
Creator: Robinson, Russell G. & Becker, John V.
Item Type: Refine your search to only Report
open access

Determination of optimum plan forms for control surfaces

Description: Solutions found for a range of airfoil plan forms indicate that, regardless of the characteristics of the tail surface, the chord of the rudder or of the elevator should be very nearly constant over its span. The optimum ailerons are also of a characteristic shape, varying little with the plan form of the wing.
Date: January 30, 1941
Creator: Jones, Robert T. & Cohen, Doris
Item Type: Refine your search to only Report
open access

Pressure distribution over an NACA 23012 airfoil with a fixed slot and a slotted flap

Description: Report presents the results of a pressure-distribution investigation conducted in the Langley Memorial Aeronautical Laboratory 7 by 10-foot wind tunnel to determine the air loads on an NACA 23012 airfoil in combination with a fixed leading-edge slot and a slotted flap. Pressures were measured over the upper and lower surfaces of the component parts of the combination for several angles of attack and at several flap settings. The data, presented as pressure diagrams and graphs of section coeffic… more
Date: July 30, 1941
Creator: Harris, Thomas A. & Lowry, John G.
Item Type: Refine your search to only Report

Newsmap. Monday, November 30, 1942 : week of November 20 to November 27

Description: Text describes action on various war fronts: Russia, Tunisia, Libya, West Africa, Martinique, New Guinea, Solomons. Front: large world map is keyed to text and illustrates time zones around the world. Inset maps: Offensive in New Guinea; Tunisia; North Africa; South Russia. Photographs: Guadalcanal; Jeeps in Russia; Unloading in North Africa; U.S. patrol landed on one of the isolated islands of the Aleutian group. Back: Aircraft insignia. Aircraft insignia are subject to change constantly. … more
Date: November 30, 1942
Creator: [United States.] Army Orientation Course.
Item Type: Refine your search to only Poster
open access

A Colorimetric Method

Description: From abstract: "This paper gives a method for determining Uranium using sodium cresotate as a colorimetric reagent. A precision is obtained of better than 2%. In carrying out analyses for Uranium in corrosion products by existing methods such as ignition to the oxide, silver reductor, or titration with ceric sulfate, it became apparent that a rapid, fairly accurate method for determining uranyl ion would be of great value. Such a method is described in this paper. The most logical color to use … more
Date: June 30, 1943
Creator: Priest, H. F. & Priest, G. I.
Item Type: Refine your search to only Report

Newsmap. Monday, August 30, 1943 : week of August 19 to August 26, 207th week of the war, 89th week of U.S. participation

Description: Front: Text describes action on various war fronts: Italy, Russia, Kiska, Berlin, Conference, Burma, China, New Guinea, New Georgia. Maps show Russian front -- Southern Italy. Includes photographs: Kiska, Sicily. Back: Weapons of the German Infantry Division. 17 weapons are identified and described, including the size, maximum range, and number found in various German Army units. Each weapon is keyed by number to a battle illustration.
Date: August 30, 1943
Creator: [United States.] Army Orientation Course.
Item Type: Refine your search to only Poster
open access

Polarographic Determination of Uranium in Dust Samples

Description: Abstract: "Samples of dust are collected from the atmosphere with a Mine Safety Appliance Co. electrostatic precipitator and analyzed for uranium by means of a dropping mercury electrode apparatus. Two to three micrograms of uranium can be detected in a cell solution volume of 1 ml. Iron, nickel and chromium present in shop dusts do not interfere. Copper may interfere if present in excess but may be removed by a sulfide precipitation. Directions for preparation of cell solution and operation of… more
Date: August 30, 1943
Creator: Smith, Stanton B.
Item Type: Refine your search to only Report
open access

Vocational teaching.

Description: "This manual is designed to help officers in the armed forces, enlisted men, or civilian instructors who are to teach for the first time." Discusses student characteristics, various aspects of teaching, and testing.
Date: September 30, 1943
Creator: United States. War Department.
Item Type: Refine your search to only Book
open access

A summary of the fission product metabolism studies up to March 1944

Description: The metabolic properties of the carrier free long lived fission products in the adult rat have been investigated at different intervals ranging from one to sixty-eight days following administration of the radioactive material. The radio elements studied include the most important long lived fission products, namely, Sr, Y, Zr, Cb, Ra, I, Xe, Cs, Ba, La, Ce, Pr, Np, and the unseparated uranium free fission mixture. The routes of administration included intraperitoneal, intramuscular, oral and in… more
Date: March 30, 1944
Item Type: Refine your search to only Report
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