Wallis, Rolland S. [from old catalog], Iowa state college of agriculture and mechanic arts, Ames. Dept. of engineering extension. [from old catalog] · Ames, Iowa, Engineering extension department, Iowa state college · leaf 65
z>W ^-l Y<--Length ----»Second Method Fig. 84.—Finding the length of a circular arc. lifting the dividers step off the same number of spaces in a reverse di-rection along the tangent BC. Then BC is the required length, thetheoretical accuracy depending on the length of the chord used. (Second
Mechanical drawing
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