London : Longman, Rees, Orme, Brown, Green, and Longman · leaf 525
bove them, from 6 in. to 1 ft. or more; if we say6 in., then the point / will be carried up to the line in n ;•, beingthe supposed surface of the ground. Let m h be joined, thenthe straight line thus formed falls within the voussoirs; conse-quently, the arch will support, in this case, any weight… … Let ah c d be a horizontal section of a well with its masonry;s] the shaft, 3 ft. in diameter; and ah c d, the brickwork, ^ in.thick, as voussoirs. Suppose a mass of earth, at the point a, were to become loose,it would fall in, but for the masonry. The tendency of the in Arches, Piers, and…
Architecture
Internet Archive · Public Domain Mark 1.0. Free to use for anything.
![An illustration from [Electric engineering.] (1902)](https://img.insideoutlibrary.com/img/200/ia-electricengineer02inte-41-5.webp)
