Johnston, Philip Devereux, 1855- · New York, D. Williams Company · leaf 89
xisG H of the cylinder (Fig. 33), theangle C will meet the angle A, andthe hypothenuse will trace the lineC D E F B, which line is called thehelix. Or if the point C (Fig. 33)be moved at a uniform speed ijinches in a straight line, thecylinder at the same timemaking one revolution at auniform rate… … FiG. ;^2.
Mechanical drawing
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