American horological journal, devoted to practical horology (1869)
Miller, George B · New York, G. B. Miller · leaf 255
ews vary in proportion to the size of thescrew and the material from which it is made.A screw with from 32 to 40 turns to the inch,and a thread of the same shape as the fine diesfor sale in the tool shops make, is well adaptedfor the large screws in a regulator. However,it is not the threads of the… … presents a view of three screws. The point ofthe screw marked B is the best kind of pointfot a screw to enter into its hole without diffi-culty. A thread, or a thread and a half, cutdown on the point of a screw, as is shown at B,will always cause a screw to enter easier thanwhen the point is flat,…
Clocks and watches
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