London : Longman, Rees, Orme, Brown, Green, and Longman · leaf 380
beengiven in Experiment 10., Essay II. (Vol. III. p. 113.) When a weight was placed at 5, on the line a h {fig. 139.),the arch and pier carried 4 lb.; which is 1 lb. more than whenit was placed over the crown of the arch. This proves that thepoint over the centre of the arch is the weakest part,… … this arch of voussoirs only, and placed it upon piers of the samebase and height as the arch Jig. 139., it balanced under theweight of 31 lb. On raising the masonry, that is, the woodenbricks, up to a h, the arch and pier balanced with Q\ lb., ordouble of the weight which the arch and pier carried…
Architecture
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