Johnston, Philip Devereux, 1855- · New York, D. Williams Company · leaf 88
Fy&. 3 O. … /7<?. J/. 83 84 A MANUAL OF MECHANICAL DRAWING. Plate 23. The Helix. Cut from a piece of thin paper,the right-angled triangle, CAB(Fig. 32), having its base or side,A B, ij inches long and the side,A C, 3.1416 inches long. If thistriangle be wound around acylinder one inch in diameter, withits…
Mechanical drawing
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
