The Electrical Experimenter, vol. 7, no. 12, April 1920

Resource added March, 2017

This issue of Electrical Experimenter contains a profile of the "physiophone," a sound reproduction device for helping deaf people to hear.

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This issue is composed of the following stories and articles, some of which go unattributed on the table of contents:

WATCHING PLANTS GROW—Front Cover From a painting by Harold Brown

ELECTRIC POWER FROM THE SUN BATTLE TRACER HEAT OF BODY DETECTED 600 FEET AWAY ONE MAN SUBWAY TRAIN

WATCHING PLANTS GROW By a remarkably sensitive instrument devised by Sir Jagadis Bose, of India

HELLO MARS! By H. Winfield Secor, Assoc. Member Amer. Inst. Electrical Engineers.

ELECTRICITY FOILS GERMAN SEALS By Fred C. Kelly

THE PHYSIOPHONE By H. Gernsback

ELECTRO-MEDICAL FRAUDS By Joseph H. Kraus

THE EDUCATED HARPOON By Charles S. Wolfe

ELECTRIC BACHELOR MAID By Edna Purdy

TELEGRAPH, CABLE AND RADIO DISPATCHES By Pierre H. Boucheron, Ensign U.S.N.R.F.

WEIGHING THE EARTH By Louis E. Derr, Prof. of Physics, Mass. Inst. of Technology

ELECTRIFYING CANAL BOATS AND BARGES By Robert G. Skerrett

TALKING OVER A SUNBEAM By Prof. A. O. Rankine. Written especially for the ELECTRICAL EXPERIMENTER

"AUTOMOBILE NEWS"

POPULAR ASTRONOMY—OBSERVING THE HEAVENLY BODIES By Isabel M. Lewis, M.A., of the U. S. Naval Observatory

"RABBIT CONTEST" AWARDS, Concluded from the March number

PRACTICAL CHEMICAL EXPERIMENTS By Prof. Floyd L. Darrow

HOME-MADE 110-VOLT, 60 CYCLE INDUCTION MOTOR By H. H. Parker

THE "FINER WORKINGS OF STATIC ELECTRICITY—Second Paper By Frederick von Lichtenow

STORAGE BATTERY REPAIRING By Henry Klaus

ELECTRICAL MACHINIST—NO. 6, ERECTING MOTORS AND SHAFTING By H. Winfield Secor

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