A course in mechanical drawing for evening schools and self-instruction (1896)
Rouillion, Louis · Boston, New York, The Prang educational company · leaf 49
at the left is a common method. Thelonger lines represent the tops of the threads and aredrawn about one-eighth of an inch apart, regardlessof what the pitch may be. The shorter lines aredrawn slightly heavier and not quite to the sides ofthe thread. At the top of the sheet straight lines are… … 42 COURSE IN MECHANICAL DRA WING. SHEET XV. Springs. This sheet shows conventional methods of repre-senting springs. The spring at tlie left may be con-sidered as a square-threaded screw from which thebody has been removed. The curves, except at theends, are shown as straight lines. The two springs…
Mechanical drawing
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