The Architectural magazine . loyed was 6 in. square at the base, and36 in. for the balancing height; because 5 ft. in 30 ft. goes sixtimes. The arch composed of voussoirs only, when placed on in Arches, Piers, and Buttresses, 377 this pillar, balanced with 5 lb. on the crown ; therefore, provingthe balancing height to be far above 36 in., it being, indeed,9Q in., and consequently, in proportion, 30 ft.; the supposed ba-lancing height of the Norman pillar is within the true height inthe same proportion. The experiments relative to figs. 151,152, 153, and 154., Vol. III. p. 411., confirm these r
The Architectural magazine . loyed was 6 in. square at the base, and36 in. for the balancing height; because 5 ft. in 30 ft. goes sixtimes. The arch composed of voussoirs only, when placed on in Arches, Piers, and Buttresses, 377 this pillar, balanced with 5 lb. on the crown ; therefore, provingthe balancing height to be far above 36 in., it being, indeed,9Q in., and consequently, in proportion, 30 ft.; the supposed ba-lancing height of the Norman pillar is within the true height inthe same proportion. The experiments relative to figs. 151,152, 153, and 154., Vol. III. p. 411., confirm these , the conclusion which may be drawn is, that the calcu-lations made to preserve the true proportions between the di-ameter of a pillar, its height, and the span of the arch, are notcorrect when the diameter of a pillar becomes one third orone half of the span. Of the Arches and Pillars belonging to the Chapel on the NorthSide of the Choir of Rochester Cathedral. — The particulars areas follows {Jig 68.): — 68. The span between the pillar and pier is 10 ft. The height ofthe pillar is 18 ft. The height of the shaft is 15 ft. 6 in. Thediameter of the pillar, which is circular, is 3 ft. The height ofthe masonry above the arches, taken from the intrados, is 10 ft.:above this there are other arches, &c. In 10 ft. there are 120 in., which, divided by 6, gives 20 the true diameter of the pillar ; but it is 3 ft. in diameter, or36 in, and therefore 16in. beyond the true diameter. These16 in. will allow 8 ft. to be added to the span for the height of Vol. IV. — No. 42. c c 378 Principles of Construction the pillar, whicli, therefore, should be 18 ft. The height, how-ever is 18 ft. 6 in., and, consequently, only 6 in. over the truedimensions. It has been shown, when treating of the Norman and Saxonarches and pillars, that, when the diameter of a pillar is greaterthan one sixth of the span, the balancing height is above thatwhich the usual calculations admit of; th
Size: 1485px × 1682px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecad, booksubjectarchitecture, bookyear1834
