Dn ee VOLUM. EK XI. ER 14. THE nying engravings. … quence of the coggad bars, and the cogs can- | inwards so as to be pressed forwards by pe then becomes equal to that of the screw of tion of its motion. This is done as follows :— | not become loosened or ungeared from each chuck, E, when the latter has advanced to the! the mandrel the latter…
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