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Scientific American, Vol. 39, No. 7 (1878) (1878)
leaf 3
e pumps, and it consists in a bar- in the said groove. The bar is caused to traverse a distance of the length of the spool, A, between its heads, thus lay- rel containing two double pistons, the rods of which pass meeting of citizens to consider the through slots in the side of the barrels, and are… … as above. and produce clear bell tones. © 1878 SCIENTIFIC AMERICAN, INC.Internet Archive · Public domain (published before 1931). Free to use for anything.
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