Petit, John Louis, 1801-1868, Delamotte, Philip Henry, 1821-1889 · London : George Bell · leaf 144
42 AECHITECTURAL STUDIES IN FRANCE. … B M and diagonal ribs, but satisfying the aforesaid condition, will not coincide with an arc of the great circle of the sphere, but will lie somewhat above it. Now, in- stead of the arc o n, described as before, let us consider an arc o p,* described with a radius o q or q p, equal to a i. This it…
Architecture
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