Johnston, Philip Devereux, 1855- · New York, D. Williams Company · leaf 72
urth Method. Fig. 4. Giving different proportions from those by thirdmethod: Draw A B and C D perpendicular to and bisectingeach other at O. Make O E equal to O C, and makeO F and O G equal to A E. Draw F G and bisect atH. Make F I equal to F H. Make O K, O J and O Lequal to O I. From K and L… … B A
Mechanical drawing
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