Fry, Horace Pugh. [from old catalog] · Philadelphia [The John C. Winston co.] · leaf 53
ough a tappedhole, the inclination ofthe screw thread at the back of the hole is reversed. A little thought with reference toFigs. 29, 30, 31 and 32 will make this clear. 4. Hidden threads are always represented by parallel dottedlines. (See nuts, Fig. 15, hole, Fig. 31, and bolt in Fig. 32.)… … Fig. 31,
Mechanical drawing
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