Mechanical drawing : a manual for teachers and students (1902)
Cross, Anson Kent · Boston : Ginn & Co. · leaf 58
oints in the circle measured in astraight line (the chord) and measured on the circle (the arc) is veryslight. 56. By using the dividers and spacing the circle accurately, thestudy of working drawings may be carried on without the introduc-tion of mathematics ; if the points in the circle are not… … Fig. 18. 50 MECHANICAL DRA WING. instruments suitable for accurate work, they should calculate the cir-cumference. This cannot be done before the pupils enter the highschool, and not often then, for the instruments generally providedare such that perfect work cannot be obtained by any method. 57.…
Mechanical drawing
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