London : Longman, Rees, Orme, Brown, Green, and Longman · leaf 388
orm is alternately cir-cular and octagonal, and not of one solid piece of stone. Theheight of the masonry above the arches is 2 ft. In 8 ft. 7 in. there are 103 in., which, divided by 6, gives 17 in.for the true diameter: but the diameter of the piers is 12 in.,and, therefore, 5 in. too small;… … 1 in. in height; therefore, they are strictly of the true balancingproportion to the span of the arches. The experiment shownby fig. 158., Vol. III. p. 418., proves the double strength ofthese cross arches and piers of the under croft. The dotted line a d terminates at (/, on the outer edge of…
Architecture
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