66 Improvements in the Part of LcnJcn, 



vibrations : the fide vibrations will be further oppofed by true 

 crofs and diagonal tves and brace?, and by the plate or grating 

 which is to be laid acrofs the ribs to receive the roadway. 



e roadway is to be compofed, firfl of a light, dry, and 

 durable vuhfhince, laid next to the iron- plates; fecondly, of 

 a compact fubftance, which will not admit of water pairing 

 through it; and, thirdly, of the fide-paths and pavements for 

 .he dnvine-wav. 



The whole external form of the bridge is to be compofed 

 of Gothic tracery; the railing is alfo to be of Gothic work, 

 with Gothic pinnacles to receive the lamps; fo that the 

 bridge will, at a diftancc, have the appearance of a frame of 

 light Gothic tracery, finiihed on the top with that wildnefs- 

 or outline of which the Gothic ftyle is fo capable. 



The abutments, by the fpreading form of the bridge, their 

 connection with the entrances at each end, and with the 

 wh arfs at each fide of it, will occupy a fpace on the fhore 

 ftifficient to form an ample foundation for an edifice capable 

 of refifting any prefTure whatever. The form and connection 

 of the mal'onry will alfo be calculated to diflribute the refift- 

 ance through the whole mafs, in the fame manner as if it 

 was a folid rock of equal magnitude : additional ftrength will 

 alfo be gained by the land arches, or warehoufes, which are 

 under the inclined planes. 



By making three entrances or avenues with the additional 

 width of the bridge at each end, advantages nearly equal to 

 thole arifing from three bridges will be afforded to the public. 

 In ah reipe&s, therefore, the bridge will be an original de- 

 fign, as its important ntuation and diflinguifhed name juftly 

 demand. 



The fcaffblding upon which the iron arch will be turned, 

 is to be formed by driving rows of piles into the river, the 

 top of which will be above low-water mark ; thefe piles to 

 be properly braced together; upon them will be raifed a 

 proper framing to fnpport the part of the iron work which 

 will reft upon them : at a convenient diftance, to admit 

 barges to pafs, another fet of piles and frames will be fixed, 

 and thefe frames will alfo be braced together, at a proper 

 height, over the barge openings, which will admit of gang- 

 ways being made quite acrofs the river, fo that the whole 

 will become one general frame from more to more. The 

 top being made to fuit the curve of the foflit of the arch, the. 

 iron work will then be fixed upon it with facility and cafe. 

 The weight of the whole iron work, when difiributed over fo 

 great a fpace, is very fmall, when compared with works con- 

 structed with fume.' The fcaflblding will not, therefore, re- 

 8 quire 



