Practical draughtsmen's work, with numerous engravings and diagrams (1903)
Hasluck, Paul N. (Paul Nooncree), 1854-1931, ed · Philadelphia, D. McKay · leaf 35
Fig. 40.—Pump Bows. Fig. 41.—Spring Bows. ordinary spring bows. Fig. 41 shows another form of spring bowwith which larger circles can be drawn. Beam compasses are useful for striking very large circles.Those fitted with a socket to take a lath are the cheapest, and aresuitable for all practical…
Mechanical drawing
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