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Report No. 302. Full scale tests on a thin metal propeller at various tip speeds
716
PUBLICATIONS
~REcEIVED.
[J. F. I.
The work was conducted in the to-foot wind tunnel of the Bureau of Standards on models of 6o-inch span and Io-inch chord. Report No. 302. Full Scale Tests on a Thin Metal Propeller at Various Tip Speeds, by Fred W. Weick. 14 pages, illustrations, quarto. Washington, Government Printing Office, 1928. Price ten cents. The investigation described in this report was made in order to determine the effect of tip speed on the characteristics of a thin-bladed metal propeller. The propeller was mounted on a VE-7 airplane with a ISo-HP. E-2 engine, and tested in the 2o-foot propeller research tunnel of the National Advisory Committee for Aeronautics. It was found t h a t the effect of tip speed on the propulsive efficiency was negligible within the range of the tests, which was from 600 to IOOO ft. per sec. (about 0. 5 to 0. 9 the velocity of sound in air). Report No. 305. The Gaseous Explosive Reaction. A Study of the Kinetics of Composite Fuels, by F. W. Stevens. 18 pages, illustrations, quarto. Washington, Government Printing Office, 1929 . Price fifteen cents. This report deals with the results of a series of studies of the kinetics of gaseous explosive reactions where the fuel under observation, instead of being a simple gas, is a known mixture of simple gases. In the practical application of the gaseous explosive reaction as a source of power in the gas engine, the fuels employed are composite, with characteristics t h a t are apt to be due to the characteristics of their components and hence may be somewhat complex. The simplest problem t h a t could be proposed in an investigation either of the thermodynamics or kinetics of the gaseous explosive reaction of a composite fuel would seem to be a separate study of the reaction characteristics of each component of the fuel and then a study of the reaction characteristics of the various known mixtures of those components forming composite fuels more and nlore complex. This is the order followed in the simple studies herein described. R.
.PUBLICATIONS RECEIVED. Gas Chemists' Handbook, J a n u a r y I, I929. Revised by the Committee on Analysis; Tests and Editing Gas Chemists' Handbook. Third edition, 795 pages, illustrations, 8vo. New York, American Gas Association, no date, price $7.oo. Theoretical Mechanics. An introduction to mathematical physics by Joseph Sweetman Ames and Francis D. Murnaghan. 462 pages, illustrations, 8vo. Boston, Ginn and Company, I929, price $5.00. Encyclop3die L3aute. Les automobiles sans Pftrole. Les Combustibles liquid artificiels par A. Mailhe. 281 pages, I2mo. Paris, Gauthier-Villars et Cie, 1929, price 3 ° francs. Infra-red Analysis of Molecular Structure, by F. I. G. Rawlins, M.Sc., and A. M. Taylor, M.A. 176 pages, illustrations, 8vo. Cambridge, University Press, New York, The Macmillan Company, 1929 . Ontario Department of Mines. Thirty-seventh annual report, being volume 37, part II, 1928. Kirkland Lake Gold Area (a detailed study of the Central Zone and vicinity) by E. W. Todd. Text, maps, plates, 2 vols., 8vo. Toronto, King's printer, I928.
PUBLICATIONS
~REcEIVED.
[J. F. I.
The work was conducted in the to-foot wind tunnel of the Bureau of Standards on models of 6o-inch span and Io-inch chord. Report No. 302. Full Scale Tests on a Thin Metal Propeller at Various Tip Speeds, by Fred W. Weick. 14 pages, illustrations, quarto. Washington, Government Printing Office, 1928. Price ten cents. The investigation described in this report was made in order to determine the effect of tip speed on the characteristics of a thin-bladed metal propeller. The propeller was mounted on a VE-7 airplane with a ISo-HP. E-2 engine, and tested in the 2o-foot propeller research tunnel of the National Advisory Committee for Aeronautics. It was found t h a t the effect of tip speed on the propulsive efficiency was negligible within the range of the tests, which was from 600 to IOOO ft. per sec. (about 0. 5 to 0. 9 the velocity of sound in air). Report No. 305. The Gaseous Explosive Reaction. A Study of the Kinetics of Composite Fuels, by F. W. Stevens. 18 pages, illustrations, quarto. Washington, Government Printing Office, 1929 . Price fifteen cents. This report deals with the results of a series of studies of the kinetics of gaseous explosive reactions where the fuel under observation, instead of being a simple gas, is a known mixture of simple gases. In the practical application of the gaseous explosive reaction as a source of power in the gas engine, the fuels employed are composite, with characteristics t h a t are apt to be due to the characteristics of their components and hence may be somewhat complex. The simplest problem t h a t could be proposed in an investigation either of the thermodynamics or kinetics of the gaseous explosive reaction of a composite fuel would seem to be a separate study of the reaction characteristics of each component of the fuel and then a study of the reaction characteristics of the various known mixtures of those components forming composite fuels more and nlore complex. This is the order followed in the simple studies herein described. R.
.PUBLICATIONS RECEIVED. Gas Chemists' Handbook, J a n u a r y I, I929. Revised by the Committee on Analysis; Tests and Editing Gas Chemists' Handbook. Third edition, 795 pages, illustrations, 8vo. New York, American Gas Association, no date, price $7.oo. Theoretical Mechanics. An introduction to mathematical physics by Joseph Sweetman Ames and Francis D. Murnaghan. 462 pages, illustrations, 8vo. Boston, Ginn and Company, I929, price $5.00. Encyclop3die L3aute. Les automobiles sans Pftrole. Les Combustibles liquid artificiels par A. Mailhe. 281 pages, I2mo. Paris, Gauthier-Villars et Cie, 1929, price 3 ° francs. Infra-red Analysis of Molecular Structure, by F. I. G. Rawlins, M.Sc., and A. M. Taylor, M.A. 176 pages, illustrations, 8vo. Cambridge, University Press, New York, The Macmillan Company, 1929 . Ontario Department of Mines. Thirty-seventh annual report, being volume 37, part II, 1928. Kirkland Lake Gold Area (a detailed study of the Central Zone and vicinity) by E. W. Todd. Text, maps, plates, 2 vols., 8vo. Toronto, King's printer, I928.