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Scientific American, Vol. 32, No. 6 (1875) (1875)
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ngs visible perfectly and saving all the material. The cen about this machine, since the disk acts as a fan tering apparatus can be used or not, as desired. and blows them away through the shoot shown The disk on the left is rotated by mechanism at the right hand of the engraving. Theheads by the… … © 1875 SCIENTIFIC AMERICAN, INC.Internet Archive · Public domain (published before 1931). Free to use for anything.
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