Scientific American Juty 18, 1903. 45 the casing consisting of. two parts joined together and ELECTRIC BLUE-PRINT MAKING. fastened by the set-screws, a’a’. These set-screws BY GEORGE J. JONES. fit into slots in the outer flange of the casing, and a The marvelous development of the blue-print has… … these blue-prints has A BLUE-PRINT-MAKING MACHINE. developed into a vast in- in position, takes up much of the vibration of the dustry. So formidable has the business grown, that Probably the most complete of these machines is tcol when working, thus protecting the hand from it has been found…
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