A WEEKLY JOURNAL OF PRACTICAL INFORMATION ART SCIENCE MECHANICS CHEMISTRY AND MANUFACTURES. Vol. XLNo. 5. [NEw mum 143.20 per Annum. 1 3 THE VOLTAIC PENCIL. ENGINE OF THE TORPEDO VESSEL DESTROYER. A NEW SWITCH PEDAL. HIISSEY'S SWITCH PEDAL FOR CONTROLLING ELECTRIC MOTORS. A Chance for Inventors. New Mechanical Inventions. ENGINE OF CAPTAIN ERICSSON'S TORPEDO BOAT 'DESTROYER., scientific american, 1879-02-01
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