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Scientific American, Vol. 54, No. 13 (1886) (1886)
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r less solid volcanic that the comet would remain visi- Fig. 2,-and | conglomerate. The footprints are very conspicu-_ half gears with the single tooth shown in : ble all night. uring the first the other half with a ring of teeth cast on the back of} ous, and seem to be those of three distinct per-… … is well known, is contained in the in a slotted lever, and causes the atmosphere of all large cities. Fig. 1.—IMPROVED MECHANICAL COUNTER. latter to reciprocate, whether the © 1886 SCIENTIFIC AMERICAN, INCInternet Archive · Public domain (published before 1931). Free to use for anything.
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