International Correspondence Schools · Scranton, Pa. : The Colliery engineer co. · leaf 359
Fig. 1.55. THE SCREW. 942. A screw is a cylinder with aspiral groove windingaround its circumfer-ence. This spiral iscalled the thread ofthe screw. The dis-tance that the threadis drawn back or ad-vanced in one turn ofthe screw is called the pitch of the screw.The screw in Fig. 155 is turned in…
Railroad engineering
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