Davies, Charles, 1798-1876 · New York, Cincinnati [etc.] American book company · leaf 192
hthere are no general surface obstructions, by the aid of auxiliaryparallel lines. In the illustration, Fig. 103, aa, Ih, cc, are the parallel lines,and aa, cc, the auxiliary lines. AB is a line in which h is a givenpoint. The distances ab, he, in this line should be measured. SEC. III.] BANGII^G… … x.<^~-
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