Practical draughtsmen's work, with numerous engravings and diagrams (1903)
Hasluck, Paul N. (Paul Nooncree), 1854-1931, ed · Philadelphia, D. McKay · leaf 59
90, p.56, from points A and b strike arcs of the same radius intersectingat c and d, and draw a line through the intersections cutting thearc at e. This line will pass through the centre. Then frompoints e and b, with a rather smaller radius, strike arcs inter-secting at / and (/ ; draw a line… … Fig. 90.—To Find the Centre of a Small Arc. lines cutting each other at right angles must be drawn for each,and it should be a stringent rule never to draw a circle under anycircumstances without first having two centre lines to mark itsposition. In the first circle (Fig. 91), mark off points J in.…
Mechanical drawing
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