London : Longman, Rees, Orme, Brown, Green, and Longman · leaf 81
h) is described, passing through the points d b and ^, andhaving its centre at o. Now, o 6 is the radius of the segment{d b h) of the circle, and ?i b is the radius of the segment of thecircle of the ellipse {i b k); but o Z» is less than h b, therefore thecircle is also less, and, consequently,… … curve of the same span;/^ h are the extrados to half of theparabola, from a io b; i \s the centre of gravity; and k is theforces of the parabola. In the experiment with this form ofaich, the following are the results of the forces of the voussoirs,beginning with the first voussoir at 6, and ending…
Architecture
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