Appleton's cyclopædia of drawing, designed as a textbook for the mechanic, architect, engineer, and surveyor (1866)
Worthen, William Ezra, 1819-1897, [from old catalog] ed, Appleton, firm, publishers, New York. (1866. D. Appleton & co.) [from old catalog] · New York, D. Appleton and company · leaf 509
he construction of cast shadows upon surfaces of the kind now underconsideration is founded upon the principle already announced, that whena circle is jparallel to aplane^ its shadow^ cast iipon that plane^ is anothercircle equal to the original circle. Take, in the first place, the case of a… … I IkiiiiiiiftJW^^^
