Machine drawing; a practical guide to the standard methods of graphical representation of machines, including complete detail drawings of a duplex pump and of a direct-current generator (1914)
Griffin, Charles Lewis, 1867-, Adams, Charles Clyde, 1882- joint author · Chicago, American technical society · leaf 90
Fig. 64. Simple Drawing of Left- and Right-Handed Square Screw Threads etc., tangent to the two helices and the projection of the thread iscompleted. It is necessary to draw the invisible parts of the twohelices in order to draw the lines ST, XY, etc.; but they need notbe left on the finished…
Machinery
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