Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 66
Fig. 149. … will be similar, and, consequently, the sides A B, B C, A D, D E, proportional—that is, as A B : B C : : A D : D E; so that if A D be the half, third,5 60 DRAWING INSTRUMENTS. or fourth part of A B, then D E will be a half, third, or fourth part ofB C ; and the same holds of all the rest. Hence, if…
Mechanical drawing
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