Discoveries and inventions of the nineteenth century (1905)
Routledge, Robert · London : G. Routledge and Sons · leaf 115
t, thus drawing up the key,E, so that the inclined planes, _/, g, press against similar surfaces formingtho ends of the dies. For producing the hollow screws, taps are provided,which are merely well-formed screws, made of hard steel and having thethreads cut into detached pieces by several… … Fig. 29.—Screw-ciitti7ig Lathe. where great accuracy is required. Perfect screws can only be cut with alathe, such as that represented in Fig. 29. In this we must first call thereaders attention to the portion of the apparatus marked A, which receivesthe name of the slide-rest. The invention of…
Inventions
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