St. Mark's rest : the history of Venice written for the help of the few travellers who still care for her monuments (1885)
Ruskin, John, 1819-1900 · New York : Lovell · leaf 355
RIGHT LINE IN HORIZONTAL PLANE. 27 So that, in order to determine the length of a b, we neednot draw the long and distant line a b, but only a r paral-lel to it, and of its sight-magnitude ; which is a great gain,for the line A b may be two miles long, and the line a bperhaj^s only two inches.…
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