The Architectural magazine . he buttresses being all similar and equal, any one of themwill be sufficient for examination. The thickness and height of one of these buttresses, at eachset off, beginning from the springing of the arch, are as followsand the dimensions are compared with those of the buttress re-presented by fig. 76. Vol. III. p. 211.: — Buttress of Kings College. Buttress shown by fig. 76. Vol. 211. Thickness. Height. Thickness. Height. 9 4 ft. 202020 ft. 468 ft. 3 6 12 The above shows that these two buttresses differ. In order to try the result of experiment, a
The Architectural magazine . he buttresses being all similar and equal, any one of themwill be sufficient for examination. The thickness and height of one of these buttresses, at eachset off, beginning from the springing of the arch, are as followsand the dimensions are compared with those of the buttress re-presented by fig. 76. Vol. III. p. 211.: — Buttress of Kings College. Buttress shown by fig. 76. Vol. 211. Thickness. Height. Thickness. Height. 9 4 ft. 202020 ft. 468 ft. 3 6 12 The above shows that these two buttresses differ. In order to try the result of experiment, a model was made,on the scale of half an inch to a foot, of the chapel buttress,omitting, however, the lower part, c d in the diagram, when theproportions became as follows: — Thickness. Height. Remarks. 9 4 40 These proportions nearly correspondwith those oifg. 76. Vol. III. p. the exception that the heightought to be 10 It., instead of 4 ft., atthe first set off. G G 4 MS Prhiciples of Construction. When a lateral force was applied at a, it required the ma-sonry to be raised 12 ft., or 6 in. in the model, before it caused thebuttress to revolve on i w ; since, with any weight less than this,the part of the buttress a m revolved only on the set off at apylying the lateral force at .r, which is 10 ft. above 7/2, themasonry was required to be raised as inj^^. 76. Vol. III. p. 211.,and, indeed, higher, before the lateral force caused the part ofthe buttress x b io revolve on n, or the whole buttress {x c) torevolve on the foundation (c). Upon adding the part d c io thebuttress, thus completing the model of the chapel buttress, andapplying the lateral force at a, it required more than twice theweight of the buttress, contained between a and c, before itwould revolve on the base {d). The same precise result ensuedwith the experiment above referred to, in Vol. III. p. 211., uponadding the part kfio it. These buttresses, throughout the building, are 23
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Keywords: ., bookcentury1800, bookdecad, booksubjectarchitecture, bookyear1834
