VELOCITY OF ICE BOATS. A COLLECTION of interesting letters to the editor of the Scientific American on the question of the speed of ice boats, demonstrating how and why it is that these craft sail faster than the wind which propels them. Illustrated with 10 explanatory diagrams. Contained in Scientific American Supplement, No. 214. Price 10 cents. To be had at this office and from all newsdealers.
ELECTRICAL. Edward P.Thompson, Solicitor of Electrical Patents, 3 Beekman Street, N. Y. Write for testimonials and instructions.
CHLORINATION OF GOLD ORES.—A paper by G. W. Small, E.M., detailing the method of chlorinating gold adopted by the Plymouth Consolidated Gold Mining Co. Contained in Scientific American Supplement, No. 545. Price 10 cents. To be had at this office and from all newsdealers.
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