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Results 15391 - 15400 of 16,845
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Development, Mining, and Handling of Ore in Folded and Faulted Areas, Red Iron Mines, Birmingham District, Alabama

Development, Mining, and Handling of Ore in Folded and Faulted Areas, Red Iron Mines, Birmingham District, Alabama

Date: 1927
Creator: Crane, W. R.
Description: Technical paper issued by the Bureau of Mines over mining of red iron ores in Birmingham, Alabama. As stated in the introduction, "the present paper deals more specifically with the development and handling of ore as affected by folds and faults in the ore bed, and considers changes that may be desirable or necessary in future mining practices" (p. 2). This paper includes illustrations, and photographs.
Contributing Partner: UNT Libraries Government Documents Department
The direct measurement of engine power on an airplane in flight with a hub type dynamometer

The direct measurement of engine power on an airplane in flight with a hub type dynamometer

Date: January 1, 1927
Creator: Gove, W D
Description: This report describes tests made to obtain direct measurements of engine power in flight. Tests were made with a Bendemann hub dynamometer installed on a modified DH-4 Airplane, Liberty 12 Engine, to determine the suitability of this apparatus. This dynamometer unit, which was designed specially for use with a liberty 12 engine, is a special propeller hub in which is incorporated a system of pistons and cylinders interposed between the propeller and the engine crankshaft. The torque and thrust forces are balanced by fluid pressures, which are recorded by instruments in the cockpit. These tests have shown the suitability of this type of hub dynamometer for measurement of power in flight and for the determination of the torque and power coefficients of the propeller. (author).
Contributing Partner: UNT Libraries Government Documents Department
Distribution of pressure over model of the upper wing and aileron of a Fokker D-VII airplane

Distribution of pressure over model of the upper wing and aileron of a Fokker D-VII airplane

Date: January 1, 1927
Creator: Fairbanks, A J
Description: This report describes tests made for the purpose of determining the distribution of pressure over a model of the tapered portion of the upper wing and the aileron of a Fokker D-VII Airplane. Normal pressures were measured simultaneously at 74 points distributed over the wing and aileron. Tests were made throughout the useful range of angles of attack with aileron setting ranging from -20 degrees to +20 degrees. The results are presented graphically. It was found that the pressure distribution along the chord is in general similar to that of thick tapered airfoils previously tested. The maximum resultant pressure recorded was five times the dynamic pressure. The distribution of the air load along the span may be assumed to be uniform for design purposes. Aileron displacements affect the pressures forward to the leading edge of the wing and may increase the air load on the outer portion of the wing by a considerable amount. With the wing at large angles of attack, the overhanging portion of the aileron creates usually a burble flow and therefore a large drag. The balance reduces the control stick forces at small angles of attack for all aileron displacements. At large angles of attack it ...
Contributing Partner: UNT Libraries Government Documents Department
Drilling and Blasting in Open-Cut Copper Mines

Drilling and Blasting in Open-Cut Copper Mines

Date: 1927
Creator: Gardner, E. D.
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Dyle and Bacalan metal monoplane, D.B. 10 : night bomber - equipped with two 420 HP. Jupiter engines

Dyle and Bacalan metal monoplane, D.B. 10 : night bomber - equipped with two 420 HP. Jupiter engines

Date: January 1, 1927
Creator: Serryer, J
Description: The D.B. 10 is manufactured of duraluminum and special high resistance steel. It can be used as a passenger aircraft or as a bomber.
Contributing Partner: UNT Libraries Government Documents Department
The effect of flight path inclination on airplane velocity

The effect of flight path inclination on airplane velocity

Date: January 1, 1927
Creator: Diehl, Walter S
Description: This report was prepared at the request of the National Advisory Committee for Aeronautics in order to supply a systematic study of the relations between the flight velocity V and its horizontal component V subscript H, in power glides. Curves of V and V subscript H plotted against the inclination of the flight path 0 are given, together with curves which show the maximum values of V subscript H and the corresponding values of 0. Curves are also given showing the effect of small departures from the horizontal in high speed performance testing.
Contributing Partner: UNT Libraries Government Documents Department
Electrical characteristics of spark generators for automotive ignition

Electrical characteristics of spark generators for automotive ignition

Date: January 1, 1927
Creator: Brode, R B
Description: This paper reports the results of an extensive program of measurements on 11 ignition systems differing widely in type. The results serve primarily to give representative data on the electric and magnetic constants of such systems, and on the secondary voltage produced by them under various conditions of speed, timing, shunting resistance, etc. They also serve to confirm certain of the theoretical formulas which have been proposed to connect the performance of such systems with their electrical constants, and to indicate the extent to which certain simplified model circuits duplicate the performance of the actual apparatus.
Contributing Partner: UNT Libraries Government Documents Department
The Ferric Sulphate-Sulphuric Acid Process: With a Chapter on Producing Small Bubbles of Gas in Liquids by Submerged Orifices

The Ferric Sulphate-Sulphuric Acid Process: With a Chapter on Producing Small Bubbles of Gas in Liquids by Submerged Orifices

Date: 1927
Creator: Ralston, Oliver C. & Maier, Chas. G.
Description: Report issued by the Bureau of Mines over studies conducted on the ferric sulphate-sulphuric acid process. As stated in the introduction, "the work reported here comprises merely a study of the chemistry of the process and the mechanical conditions that would have to be observed in practice" (p. 1). This report includes tables, and illustrations.
Contributing Partner: UNT Libraries Government Documents Department
Fifty-Nine Coal-Mine Fires: How They Were Fought and What They Teach

Fifty-Nine Coal-Mine Fires: How They Were Fought and What They Teach

Date: 1927
Creator: Rice, George S.
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Flow and Drag Formulas for Simple Quadrics

Flow and Drag Formulas for Simple Quadrics

Date: January 1, 1927
Creator: Zahm, A F
Description: This report gives the pressure distribution and resistance found by theory and experiment for simple quadrics fixed in an infinite uniform stream of practically incompressible fluid. The experimental values pertain to air and some liquids, especially water; the theoretical refer sometimes to perfect, again to viscid fluids. For the cases treated the concordance of theory and measurement is so close as to make a resume of results desirable. Incidentally formulas for the velocity at all points of the flow field are given, some being new forms for ready use derived in a previous paper. (author).
Contributing Partner: UNT Libraries Government Documents Department