186 Mr. White's Design for the New Loiidon Bridge, 



throw some light on the subject if they have not before been 

 agitated. I am willing to contribute with the greatest plea- 

 sure my further ideas, which from an attention to the matter 

 are somewhat matured, and which I am nearly prepared to 

 communicate in a more perfect form. 



I have the honour to be, Sir, your most humble servant. 

 New Road, Marylebone, Jan. 14, 1823. John White. 



II. To John Wliite, Esq. 



Sir, — Your favour of the 14th instant, relative to the im- 

 provement of the River Thames at London Bridge, has been 

 laid before the Committee for letting the Bridge House Estates, 

 who have directed me to inform you, that as soon as they shall 

 have awarded the premiums for the designs furnished for re- 

 building London Bridge, which will in all probability be done 

 in a few days, they will take your letter into consideration. 



I have the honour to be. Sir, your obedient servant, 



Sion College Gardens, Jan. 22, 1823. R. F. Newman. 



III. To Dr. Olinthus Gregory, Royal Militai-y Academy, 

 Woolvoich. 



Sir, — My brother has had the goodness to introduce to your 

 observations the accompanying papers respecting London 

 Bridge, which were written to elucidate my design for the new 

 structure. 



I am desirous of obtaining the judgement of a [previous] 

 stranger [to my plans] of your well known abilities, and I shall 

 consider it an eminent favour if you would condescend to 

 communicate to me your sentiments thereon at an early 

 period, whether for my private satisfaction, or to show to my 

 friends, as may be agreeable to yourself. 



I have the honour to be. with the greatest respect, 



Sii", your most humble servant. 



New Road, Marylebone, March 3, 1823. John White. 



IV. On the Plans for erecting a Neiv London Bridge, distin- 

 guished by the Signature " Amicus." 



The author of the accompanying plans (marked [Plate II.] 

 1, 2, 3, 4-, 5) is of opinion that in the construction of bridges the 

 following particulars deserve especial attention, viz. 



First. The pressure or gravitation of the component ma- 

 terials. 



Secondly. The cohesion of those materials, the principles 

 of gravitation and cohesion being, in practice, in many respects 

 essentially different. 



A bridge depending principally on the gravity, and conse- 

 quently on the pressure or equilibration of its constituent parts, 

 in order to be perfectly durable, must be formed of the most 



costly 



