Essentials of drafting; a text and problem book for apprentice, trade and evening technical schools (1918)
Svensen, Carl L. (Carl Lars), 1884- · New York, D. Van Nostrand company · leaf 58
15 Fig. ei indicated in Fig. 81 by d. The diameter d\ is called the rootdiameter. Point h is the top of the thread and point a the bot-tom, or root. The area corresponding to d\ is called the rootarea. One half the difference between the outside diameter andthe root diameter is called the depth of… … Fig. 62 Fig. 85 screw to be turned in a clockwise direction to enter the nut.A left-hand screw thread (Fig. 99) must be turned counter-clock-wise when entering. The pitch of a screw thread is the distancewhich the screw will advance for one complete turn for a singlethreaded screw. Forms of Screw…
Mechanical drawing
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