I.C.S. reference library : a series of textbooks prepared for the students of the International Correspondence Schools and containing in permanent form the instruction papers examination questions, and keys used in their various courses (1904)
International Correspondence Schools · Scranton : International Textbook Co. · leaf 281
3. In machine construction, screws are used more fre-quently as fastening devices than as a means of transmittingmotion or producing pressure. Screws used as fasteningdevices may be divided into two general classes, which aredistinguishable from each other by the form of thread used:(1) Metal… … Fig. 42. latter, as also in the sharp V thread, the sides of the threadform a 60° angle. In the United States standard thread,the thread is flattened at the top and bottom, as shown in §5 MACHINE ELEMENTS. 57 the figure. The advantage of this is that it makes a strongerscrew for equal pitches and…
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