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📖 Description
April 1920 issue of Electrical Experimenter, Vol. 7, No. 12, Whole No. 84. The cover story is "Watching Plants Grow."
Main Contents of this Issue:
Editorial: The Earth's Interior Molten? (Hugo Gernsback) Electric Power From The Sun The Battle Tracer Heat of Body Detected 600 Feet Away One-Man Subway Train Watching Plants Grow Hello Mars! (H. Winfield Secor) Electricity Foils German Seals (Fred C. Kelly) The Physiophone: Music for the Deaf (H. Gernsback) Electro-Medical Frauds (Joseph H. Kraus) "The Educated Harpoon" (Charles S. Wolfe) Electric Bachelor Maid Telegraph, Cable and Radio Dispatches (Pierre H. Boucheron) Weighing the Earth (Louis Derr) Electrifying Canal Boats and Barges (Robert G. Skerrett) Talking Over a Sunbeam (Prof. A.O. Rankine) Sawing Ice By "Motor" This Fire Alarm "Talks" Automobile News Popular Astronomy: Observing The Heavenly Bodies (Isabel M. Lewis, M.A.) Sir Ernest Rutherford, On The Problems of Radioactivity "Rabbit Contest" Awards Practical Chemistry Experiments (Prof. Floyd L. Darrow) The Constructor: Home-made 110-Volt, 60-Cycle Induction Motor (H.H. Parker) Home-made A.C. Motor The "Finer Workings" of Static Electricity - 2nd Paper (Frederick von Lichtenow) Electro-Monogram Sign for the Boys Measuring Electric Currents With the Eye (C.A. Briggs) Storage Battery Repairing (Henry Klaus) The Electrical Machinist (H. Winfield Secor) How-To-Make-It Wrinkles, Recipes, Formulas (S. Gernsback) Radio Department: Some Long Distance Radio Telephone Tests (Robert F. Gowen) Music 400 Miles by Radio "Direct Current" Transmitter Audions on Alternating Current Again! Latest Radio News New Amateur Wireless Transmitting Set Selective Wireless Control (Everett Leo Deeter) War Versus Pre-War Apparatus ("Sparks") What To Invent (Jay G. Hobson) Latest Patents With the Amateurs Science With A Bang (Everson Westerling) The Oracle Opportunity Ad-lets
Original Publisher: Experimenter Publishing Company, Inc., 1920 Editor: Hugo Gernsback Size: 8.25" x 11.5" Issue: Volume 7: Number 12; Whole No. 84; April 1920 Pages: 124