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Zinc and its alloys

Description: A report on zinc and its alloys.
Date: November 6, 1931
Partner: UNT Libraries Government Documents Department

Limits of Inflammability of Gases and Vapors

Description: From Definitions: "It is the object of this paper to present the results of a critical review of all figures published on the limits of inflammability of combustible gases and vapors when in admixture with air, oxygen, or other "atmosphere." Suspended dusts and liquid mists are not considered."
Date: 1931
Creator: Coward, H. F. & Jones, G. W.
Partner: UNT Libraries Government Documents Department

Gases that Occur in Metal Mines

Description: From Conclusions: "Many gases are harmful to man are widely prevalent in metal mines. They influence the safety, health and efficiency of miners; workers and officials should therefore become much more familiar with there occurrence, detection, and handling. The principal means of combating these gases are proper ventilation of all parts of a mine and the adoption of measures to minimize fire hazards and to control a mine fire promptly should it occur."
Date: 1931
Creator: Harrington, D. & Denny, E. H.
Partner: UNT Libraries Government Documents Department

Report of the Twenty-Fourth National Conference on Weights and Measures, 1931

Description: Report of the annual conference on weights and measures, hosted by the U.S. National Bureau of Standards in Washington D.C. It includes conference proceedings, a list of attendees, information about committees and officers, and other reports or commentaries discussed at the meetings.
Date: June 1931
Creator: United States. National Bureau of Standards.
Partner: UNT Libraries Government Documents Department

Report of the Twenty-Third National Conference on Weights and Measures, 1930

Description: Report of the annual conference on weights and measures, hosted by the U.S. National Bureau of Standards in Washington D.C. It includes conference proceedings, a list of attendees, information about committees and officers, and other reports or commentaries discussed at the meetings.
Date: June 1931
Creator: United States. National Bureau of Standards.
Partner: UNT Libraries Government Documents Department

United States Earthquakes, 1929

Description: Report discussing earthquake activity in the United States during 1929. The report is broken down by regions and has sections for specific earthquakes.
Date: 1931
Creator: Heck, N. H. & Bodle, R. R.
Partner: UNT Libraries Government Documents Department

Explosives Accidents in the Anthracite Mines of Pennsylvania: 1923-1927

Description: From Basis and Purpose of Report: "This report constitutes a large-size sample of these causes as taken from the Pennsylvania Department of Mine records. This report should therefore be a valuable experience record for all those who seek to prevent accidents with explosives, especially to all users of explosives."
Date: 1931
Creator: Howell, S. P.
Partner: UNT Libraries Government Documents Department

Methods and Apparatus Used in Determining the Gas, Coke, and By-Product Making Properties of American Coals: with Results on a Taggart-Bed Coal from Roda, Wise County, Virginia

Description: From Introduction: "The results of this preliminary investigation, which were reported to the association at the 1928 convention, indicated, first, that fundamental information on the mechanism of carbonization throughout the entire range from low to high temperature coking is desired and, second, that a uniform basis upon which to compare the carbonizing properties of different coals should be developed."
Date: 1931
Creator: Fieldner, A. C.; Davis, J. D.; Thiessen, R.; Kester, E. B. & Selvig, W. A.
Partner: UNT Libraries Government Documents Department

A Study of Refractories Service Conditions in Boiler Furnaces

Description: From Scope of Report: "The findings of the preliminary survey are first briefly presented; these are followed by a general description of the furnaces and fuels investigated. A chapter follows on each of the four conditions of service studied: (1) The temperature and composition of the furnace gases, (2) the velocity of the furnace gases, (3) the temperature of the refractories, and (4) the composition and characteristics of boiler-furnace slags. In each chapter the significance of the condition of service, the factors that govern it, the method of investigation, representative data from the installations, and a comparative summary are given."
Date: 1931
Creator: Sherman, Ralph A.
Partner: UNT Libraries Government Documents Department

Jigging, Classification, Tabling, and Flotation Tests of Coals Presenting Difficult Washing Problems, with Particular Reference to Coals from Pierce County, Washington

Description: From Content and Arrangement of Report: "For the convenience of the reader the bulletin has been divided into two parts. Part I describes the investigation and summarizes the most important results. Part II gives the detailed data of the best of the washing tests by each process."
Date: 1931
Creator: Bird, B. M. & Marshall, S. M.
Partner: UNT Libraries Government Documents Department

The Jackson Gas Field, Hinds and Rankin Counties, Mississippi

Description: From abstract: The Jackson gas field, in Hinds and Rankin Counties, Miss., is in the eastern Gulf Coastal Plain, about 160 miles north of New Orleans and 40 miles, east of the Mississippi River at Vicksburg. The gas is produced from a Cretaceous chalk from 2,088 to 2,236 feet below sea level. Overlying the chalk is the regular sequence of Tertiary rocks found in Mississippi. On the crest of the anticline in the city of Jackson the Cockfield formation of the Claiborne group is exposed, surrounded by the Jackson formation. Some Forest Hill sand of the Vicksburg group is exposed in the northwestern part of the area described. Overlapping these formations are Pliocene and Pleistocene terrace and alluvial deposits, and the entire area is covered by a blanket of less of varying thickness.
Date: 1931
Creator: Monroe, Watson Hiner
Partner: UNT Libraries Government Documents Department

Petroleum Refinery Statistics: 1929

Description: Report discussing petroleum refinery statistics for 1929.
Date: 1931
Creator: Hopkins, G. R.
Partner: UNT Libraries Government Documents Department

Quicksilver

Description: From Introduction: "Material for this report was gathered during the last quarter of 1928 and the first quarter of 1929, when the author visited the quick-silver-producing districts of California, Nevada, Texas, Oregon, Washington and Arizona to view the progress made in recent years and gather material for a comprehensive study of the present-day quicksilver industry of the United States."
Date: 1931
Creator: Schuette, C. N.
Partner: UNT Libraries Government Documents Department

Some characteristics of fuel sprays at low-injection pressures

Description: This report presents the results of tests conducted at the Langley Memorial Aeronautical Laboratory, Langley Field, Va., to determine some of the characteristics of the fuel sprays obtained from an 0.008-inch and a 0.020-inch open nozzle when injection pressures from 100 to 500 pounds per square inch were used. Fuel oil and gasoline were injected into air at densities of atmospheric land 0.325 pound per cubic foot. It was found that the penetration rate at these low pressures was about the same as the rate obtained with higher pressures. Spray cone-angles were small and individual oil drops were visible in all the sprays. Gasoline and fuel oil sprays had similar characteristics.
Date: November 1, 1931
Creator: Rothrock, A. M. & Waldron, C. D.
Partner: UNT Libraries Government Documents Department

Moments of inertia of several airplanes

Description: This paper, which is the first of a series presenting the results of such measurements, gives the momental ellipsoids of ten army and naval biplanes and one commercial monoplane. The data were obtained by the use of a pendulum method, previously described. The moments of inertia are expressed in coefficient as well as in dimensional form, so that those for airplanes of widely different weights and dimensions can be compared.
Date: May 1, 1931
Creator: Miller, Marvel P & Soule, Hartley A
Partner: UNT Libraries Government Documents Department

The effect of slots and flaps on the lift and drag of the McDonnell Airplanes determined in flight

Description: This note contains the results of flight test conducted by the National Advisory Committee for Aeronautics on a low-wing monoplane equipped with leading-edge slots extending over the entire wing and flaps extending only to the ailerons, to find their effect on the lift and drag characteristics of the airplane. Curves are given showing the lift and drag characteristics of the airplane for the following conditions of the slots and flaps neutral; slots closed and flaps down; and slots open and flaps down. In addition, the high and low speed in level flight and the climbing characteristics are given. The results show that the slots used alone increase the maximum lift coefficient 54 per cent; the flaps alone increase it 38 per cent; and the slots and flaps in combination decrease the landing speed from 60 to 43 m.p.h.; increase the speed range of the airplane 40 per cent; and increase the glide angle at landing speed 4.2 degrees.
Date: November 1, 1931
Creator: Soule, Hartley A
Partner: UNT Libraries Government Documents Department

Effect of orifice length-diameter ratio on the coefficient of discharge of fuel-injection nozzles

Description: The variation of the coefficient of discharge with the length-diameter ratio of the orifice was determined for nozzles having single orifice 0.008 and 0.020 inch in diameter. Ratios from 0.5 to 10 were investigated at injection pressures from 500 to 5,000 pounds per square inch. The tests showed that, within the error of the observation, the coefficients were the same whether the nozzles were assembled at the end of a constant tube or in an automatic injection valve having a plain stem.
Date: March 1, 1931
Creator: Gelalles, A G & March, E T
Partner: UNT Libraries Government Documents Department

Performance of a compression-ignition engine with a precombustion chamber having high-velocity air flow

Description: Presented here are the results of performance tests made with a single-cylinder, four stroke cycle, compression-ignition engine. These tests were made on a precombustion chamber type of cylinder head designed to have air velocity and tangential air flow in both the chamber and cylinder. The performance was investigated for variable load and engine speed, type of fuel spray, valve opening pressure, injection period and, for the spherical chamber, position of the injection spray relative to the air flow. The pressure variations between the pear-shaped precombustion chamber and the cylinder for motoring and full load conditions were determined with a Farnboro electric indicator. The combustion chamber designs tested gave good mixing of a single compact fuel spray with the air, but did not control the ensuing combustion sufficiently. Relative to each other, the velocity of air flow was too high, the spray dispersion by injection too great, and the metering effect of the cylinder head passage insufficient. The correct relation of these factors is of the utmost importance for engine performance.
Date: October 1, 1931
Creator: Spanogle, J A & Moore, C S
Partner: UNT Libraries Government Documents Department

A method for reducing the temperature of exhaust manifolds

Description: This report describes tests conducted at the Langley Memorial Aeronautical Laboratory on an "air-inducting" exhaust manifold for aircraft engines. The exhaust gases from each cylinder port are discharged into the throat of an exhaust pipe which has a frontal bellmouth. Cooling air is drawn into the pipe, where it surrounds and mixes with the exhaust gases. Temperatures of the manifold shell and of the exhaust gases were obtained in flight for both a conventional manifold and the air-inducting manifold. The air-inducting manifold was installed on an engine which was placed on a test stand. Different fuels were sprayed on and into the manifold to determine whether the use of this manifold reduced the fire hazard. The flight tests showed reductions in manifold temperatures of several hundred degrees, to values below the ignition point of aviation gasoline. On the test stand when the engine was run at idling speeds fuels sprayed into the manifold ignited. It is believed that at low engine speeds the fuel remained in the manifold long enough to become thoroughly heated, and was then ignited by the exhaust gas which had not mixed with cooling air. The use of the air-inducting exhaust manifold must reduce the fire hazard by virtue of its lower operating temperature, but it is not a completely satisfactory solution of the problem.
Date: September 1, 1931
Creator: Schey, Oscar W & Young, Alfred W
Partner: UNT Libraries Government Documents Department

Investigation of the discharge rate of a fuel-injection system

Description: In connection with the development of a method for analyzing indicator cards taken from high-speed compression-ignition engines, this investigation was undertaken to determine the average quantity of fuel discharged during each crank degree of injection period.
Date: April 1, 1931
Creator: Gerrish, Harold C & Voss, Fred
Partner: UNT Libraries Government Documents Department

Experiments with an airfoil model on which the boundary layers are controlled without the use of supplementary equipment

Description: This report describes test made in the Variable Density Wind Tunnel of the NACA to determine the possibility of controlling the boundary layer on the upper surface of an airfoil by use of the low pressure existing near the leading edge. The low pressure was used to induce flow through slots in the upper surface of the wing. The tests showed that the angle of attack for maximum lift was increased at the expense of a reduction in the maximum lift coefficient and an increase in the drag coefficient.
Date: April 1, 1931
Creator: Abbott, I H
Partner: UNT Libraries Government Documents Department