Practical draughtsmen's work, with numerous engravings and diagrams (1903)
Hasluck, Paul N. (Paul Nooncree), 1854-1931, ed · Philadelphia, D. McKay · leaf 56
line, three-quarters of an inch from the edge all round the paper,then draw vertical and horizontal centre lines, so that theirintersection will show the point where the point of the com-passes is to be placed. Open the compasses to 2 in., measuredon one of the scales, and strike the outer circle.… … Fig. 84.—Finding Centre of Circle. the inner circle. The illustrations printed in this book are halfthe size they are to be drawn. The difficulty of estimating the point that is exactly thecentreof a circle may be tested by taking a penny and marking theoutline of a circle with it on the paper ;…
Mechanical drawing
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