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Scientific American, Vol. 42, No. 22 (1880) (1880)
leaf 7
g recesses in minutest tremors of the earth are thus made visible. a cam, D,:on the bolt, connecting the stock and the barrel, the sole on the upper side. Itis secured to the heel of the The system next to the left is substantially the same, save and when the barrel is released by drawing the… … rent alcohol copal varnish to sortment of them on exhibi- cover and imbedthe ornament, tion and for sale. © 1880 SCIENTIFIC AMERICAN, INCInternet Archive · Public domain (published before 1931). Free to use for anything.
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