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Scientific American, Vol. 61, No. 7 (1889) (1889)
leaf 3
ld it In Fig. 1 of the illustrations, 1 represents a tooth in position in the drawhead, and in which the parts will having a cavity needing filling ; 2 and 3 show a matrix always be in a position for automatic coupling after fitted. to the cavity ; 4 shows a filling fitted to the mat- the cars have… … certain forms of rubber, may be modified in color to want all the back numbers, © 1889 SCIENTIFIC AMERICAN, INCInternet Archive · Public domain (published before 1931). Free to use for anything.
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