Practical draughtsmen's work, with numerous engravings and diagrams (1903)
Hasluck, Paul N. (Paul Nooncree), 1854-1931, ed · Philadelphia, D. McKay · leaf 58
Fig. 88.—Concentric Arcs. in a straight line, that is, measuring the chord of the arc insteadof the arc itself. These might be called parallel curves, and,although this is an expressive term and not likely to be mis-understood, they are not a correct example of parallelism. , Now try three more… … Fig. 89.—-Arcs of Equal Kadius. as at Fig. 89, say 3 in., and the same distance apart on the centreline, say i in. These curves are exact counterparts of each other,although they look much less regular than the concentric arcs,and an important principle is involved in the comparison. To find the…
Mechanical drawing
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