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 379
Fig. 42. Observation. In general, inclined lines are most needed for gable roofs,in which, when the conditions aic properly stated, the verticalheight of the gable, x y, Fig. 43., is given, and the base line. Y B
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