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Scientific American, Vol. 80, No. 13 (1899) (1899)
leaf 7
lass containing an endless number of varieties, leaden pendulum weights, of 12 pounds each, and ca- pable of being raised or lowered at will; four 4% inch determined by modifications in time, phase, and ampli- tude. A few of the more striking figures are shown in brass tubes resting upon knife… … 15.—Close ratio. © 1899 SCIENTIFIC AMERICAN, INC.Internet Archive · Public domain (published before 1931). Free to use for anything.
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