ed Stock Exchange. Van Norman only a time and labor saving SCIENTIFIC AMERICAN SUPPLEMENT No. 792. 66 BROADWAY & 17 NEW ST.. NEW YORK. device, but does its work uc- 2. Why is the magnet in a telephone receiver ‘Universal Bench Lathes curately and Booklets giving our successful plan for realizing… … Remington by a twenty per cent grade’ <A. A twenty 1-50 per cent grade rises or falls 20 feet for every 100 feet measured horizontally and not on the slope. In other words, the grade is measured by the tangent of the angle of inclination and not by its sine, so that a 100 per cent grade corresponds…
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