Instruction Paper: Subject: Mechanical Drawing (Classic Reprint) - Hardcover

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Excerpt from Instruction Paper: Subject: Mechanical Drawing

It will be noticed that the width of the thread and of the groove, measured parallel to the center line m n, and the depth of the thread, are all exactly the same; that is, they are each equal to one-half of the pitch. If a section were taken through the center line ma, the thread and groove would look like Fig. 71, a series of squares hence the term square thread.

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