Fry, Horace Pugh. [from old catalog] · Philadelphia · leaf 67
the hole is to be tappedto take a screw f in diameter. CONVENTIONAL THREADS. 1. This method of showingscrew threads is to be used, for clearness and economy, when thediameter of a thread, as drawn, measures less than | on straightthreads (see Fig. 46) and less than 1 on pipe threads (see Plate S).… … Fig. 46. on the piece. If the thread is other than the U. S. Standard, orif the number of threads does not correspond with the standardnumber for the given diameter, there should be a note to thateffect, thus: ISthds per inch, Square Threads 4 per inch,Double Square Thread 2 pitch, Triple V Thread…
Mechanical drawing
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