Practical draughtsmen's work, with numerous engravings and diagrams (1903)
Hasluck, Paul N. (Paul Nooncree), 1854-1931, ed · Philadelphia, D. McKay · leaf 34
S. 31 quality of proportional compasses have additional scalesengraved upon them, giving the ratios of diameters of circles,areas, and other tables, and some have also a rack and pinionmotion, for setting the centre pivot in its correct position. Fig. 36.—Bow Corr.pass. Bisecting compasses are a… … Fig. 37.—Spring Bow Dividers.
Mechanical drawing
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
