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Scientific American, Vol. 90, No. 8 (1904) (1904)
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ment In order to limit the movement of the magnet frame The applications of these brakes have given ex- combined. and to determine the zero position, an upright carry- cellent results, and it is to be anticipated that all those “The wall was of a dirty, almost grayish-white. Had ing two stops and… … enough to give an idea of north-south position, points © 1904 SCIENTIFIC AMERICAN, INC.Internet Archive · Public domain (published before 1931). Free to use for anything.
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