Abstract

Journal of the Franklin Institute, No. 3, September 1884.— Synchronous-multiplex telegraphy in actual practice, by Prof. Edwin 1. Houston (illustrated).—An extraordinary experiment in synchronous-multiplex telegraphy, by Prof. Edwin J. Houston. —On the application of electricity as an illuminating agent in astronomical observatories, by W. S. Franks.—A mctastatic heat regulator, by N. A. Randolph, M.D. (one figure).-The drying of gunpowder magazines, by Prof. C. E. Munroe, U.S.N.A.—On an explanation of Hall's phenomenon, by Shel-ford Bidwell, M.A., LL.B. (table).—Instruction in mechanical engineering, by Prof. R. H. Thurston.—Report on the trial of the “City of Fall River,” by J. E. Sague, M.E., and J. B. Adger, M.E. (concluded from p. 115) (tables and diagrams).—Report of the Board of Experts on Street-paving (tables).—Surveys for the future water-supply of Philadelphia, by Rupert Hering, C.E. (tables).—Methods in physical astronomy.—Solar motor and solar temperature.-Hirn's actinometer.—Soap-roots.— Aluminium and aluminium-bronze.—Palmieri's atmospheric electricity.—New electro-magnet.—Tanning by electricity.— Gases in steel.—The volcanic ashes of Krakatoa.—Papal Observatory.—Origin of volcanic activity.—Balloon photography.

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