London : Longman, Rees, Orme, Brown, Green, and Longman · leaf 392
ie 8 ft. diagonal is readily found. For 4 is to5^ as 8 halves are to 11 halves: again, 11 is to 8 as 8 is to5 ft. 10 in., the square required. Now, 5 ft. loin, contain 70 in., which is 18 in. above 52, thetrue diameter ; and will therefore allow 9 ft. to be added to theheight of the pillars above… … sidered with their square sides to the thrust of the arch. They,however, are placed diagonally; and, according to experiment,the balancing point is raised, in consequence, up to the point /?,which is one fourth higher than the square side admits of. Theexperiment was conducted as follows, the scale…
Architecture
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