Fry, Horace Pugh. [from old catalog] · Philadelphia · leaf 66
. Triple thread 3 pitch, means three threads eachmaking three revolutions per inch. 63 11. The diameter of a threadof the threaded portion of a piece. 12. Screw threadsin a section are drawnas shown in Fig. 44.Note that at B the pointand root Hnes are notdrawn across the section,and that those… … Fig. 44. TAPPED HOLES. 1. The diameter of a tapped (threaded)hole is the outside diameter of the threaded piece that would fit that hole, not R the
Mechanical drawing
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