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Scientific American, Vol. 30, No. 7 (1874) (1874)

leaf 4

An illustration from Scientific American, Vol. 30, No. 7 (1874), 1874, leaf 4
, but which the continual an ordinary grate except sible. “thud!” “thud!” that salutes our ears proclaims to be the thatit has a high brick back site of the cancelling machine. Approaching, we find that eS 1 OO which forms the exterior IMPROVED WOOD SCREW. boundary of a chamber, ¢, Messrs. A. N.… … portion of the screw. The channel or groove, C, is cut, no ? vance of the mantel. through the threads alone, but into the body of the screwt Mr. Siemens remarks that and retains the wood cut away by the bit. Fig. 1.—CANCELLING REDEEMED GREENBACKS. ee the cheerfulness of an open the apparatus…

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