London : Longman, Rees, Orme, Brown, Green, and Longman · leaf 301
, in 10ft. there are 120 in.: this number, divided by 20,the diameter of the pillars, gives 6 ; that is to say, the diameterof the piers is just one sixth of the span of the arch. On turningto fig. 149. (Vol. III. p. 410.) it will be seen that the pointedarch, composed of voussoirs only, just… … up to a b, the arch will carry double the weight it supportedwithout the masonry. Now, the rise of this arch is 8^ in., thespan being 10 in., and the masonry above the rise 3^ in. In the drawing of the church (^g. 56.\ the masonry abovethe rise is 7 ft., which equals the height of the fourteenth…
Architecture
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