Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 717
to draw the semicircle on a line parallel to themajor axis, and entirely without the lines of the main drawing; and also, as inthe example of the bevel-gear, complete on the semicircle, or half-plan, thedrawings of all lines, the intersections of which with circles it will be necessaryto project on… … seen how graphically these forms of gearing are given by isometry. Fig. 1779is an isometrical projection of a water-closet cistern with a standard waste.
Mechanical drawing
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