Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 53
Fig. 112. Fig. 113. and from these points draw a succession of circular arcs; thus, from o lay off0 g^ equal to the arc a o reduced to a straight line, and connect a and ^ by acurve ; from e, with the radius e g, describe the arc g li; from / the next arc,and so on. Continue the use of the centres… … The simple drawing instruments illustrated and applied in the construc-tion of the preceding problems, together with scales of equal parts, a protractor,and a drawing-pen, are all the instruments essential for topographical or me-chanical drawing. It is often convenient, for-facility in working, to…
Mechanical drawing
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