and of the intended Bridge, 6$ 



The particulars of thefe mafterly difquifitions are contained 

 in tiie Appendix to the fourth Report of the Select Committee 

 for the further improvement of the port of London : they 

 will be the means of throwing much new light on this im- 

 portant fubject, and will, molt probably, change the princi- 

 ples and practice of this fpecies of architecture. 



It would require many drawings and much detail to convey 

 an adequate idea of the form and conftruction of this magni- 

 ficent arch ; it cannot properly be mown as whole in a draw- 

 ing upon any fcale that would fuit a publication of this na- 

 ture. We underfiand the public curiofity will be fpeedily 

 gratified with a perfpective view, taken from the Surrey fide 

 of the prefent London bridge, on a plate four feet long and 

 two feet wide, and which, befides the new bridge, compre- 

 hends the principal objects in the cities of London and Weft- 

 minfter, from Bow church to Whitehall ; and the propofed 

 wharfs, warehoufes, and terraces, between the bridges. The 

 bridge part is engraved by that eminent artill Mr. Lowry, 

 whole fcientific knowledge is only exceeded by his dexterity 

 as an engraver; and al! the relt by Mr. Malton, whofe views 

 of London have done him honour, and qualify him to give 

 the back ground with a precifion which no other artift could 

 be ex peeled to equal. 



According to this plan, the bridge is to be compofed wholly 

 of call: iron, which is much lets liable to decay or alteration 

 than hammered iron. The ribs are to be call in pottions of as 

 large a fize as to be conveniently .moulded, and caft correctly, 

 and fuch as can be readily managed in the removing and put- 

 ting up : they are to be connected together by crofs and di- 

 agonal tyes and braces, placed in fuch a manner that any 

 of the pieces of the ribs or tyes, or braces, may be taken out 

 feparately, and be replaced without injury or interruption to 

 the bridge. The ribs will receive the weight and preflure in 

 a direction that the itrefs will operate upon the pieces of iron 

 endways ; therefore, before the bridge can give way, the iron 

 mult be crufhed to pieces. All the frames or ribs are to be 

 connected vertically and horizontally from the foffit of the 

 arch to the roadway, fo that the whole bridge will act as one 

 frame, and by that means lefien the lateral prelfure againlt 

 the abutments, and <niard againft any error in the equilibra- 

 tion of the arch. The ribs are to be fo difpofed that they 

 fpread from the middle of the bridge to the abutments, with 

 the view of caufing the abutments to embrace a greater fpacc 

 on the Ihorej to increafe the width of the bridge, to accom- 

 modate the roadway in turning towards the inclined planes, 

 and to prevent any tendency the bridge might have to fida 



Vol. X. E vibrations: 



