Johnston, Philip Devereux, 1855- · New York, D. Williams Company · leaf 74
, 2-8, 3-9, etc. Divide one semi-diameteror radius into as many equal parts as for the circle, asi-2-3-4, etc. With compass in o and radius o-isweep an arc cutting radius i, with radius 0-2 sweepan arc cutting radius 2, with radius 0-3 sweep an arccutting radius 3, and so on until all the points on… … r/G. 2/ //ID
Mechanical drawing
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
