London : Longman, Rees, Orme, Brown, Green, and Longman · leaf 135
lb., by sinking down at c, and by being forced outat the points d and e\ the voussoirs oX a b were secured frombeing pressed outwards. The dotted line c b almost touchesthe intrades at g. Exjjcriment Fourth. — The same arch of fifteen voussoirs {^fig.22.) sustained, at the point e^ 3^ lb., but gave… … cular arch {Jig. 21.), and is rather moie than 19 in. in span.On the voussoirs at a 6 being made immovable, I placed myfoot on the crown at r, and stood with my whole weight upon it(a weight equalling ll? lb.), and it supported me without yieldingin the least degree. The dotted line c b lies, in…
Architecture
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