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Scientific American, Vol. 89, No. 3 (1903) (1903)
leaf 3
f the drill. When it is desired to re- are disposed as follows: The flexible shaft is con- move the core, coarse gravel is poured down the hol- tinuous with the shaft, B, the crank of which works low tubes, which wedges in between the core and core within the expanded portion of the casing and… … formed part of or to be more correct the action of the shot on the AND CAST IRON BY THE STEEL the structure. Fig. 3.—THE HAMMER AND ITS TOOL, *ock is one of crushing rather than grinding, and for SHOT PROCESS. © 1903 SCIENTIFIC AMERICAN, INCInternet Archive · Public domain (published before 1931). Free to use for anything.
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