408 Mr. E. Gallo way o?i a new Paddle- Wieel. 



The most strange part of the experiment is, that although 

 it is a simple solution of carbon in oxygen, the gas not being 

 condensed, consequently the solid carbon must expand to 

 become gaseous ; yet caloric is liberated not only in sufficient 

 quantity to maintain the combustion, but also to fuse the sup- 

 porting platinum wire, many times the weight of the diamond. 

 I generally use flat or rose diamonds, as they are more readily 

 secured in the wire ; one of the value of two or three shillings 

 is quite large enough. In some instances in which I have in- 

 terrupted the experiment to examine the gem, its surface was 

 dull, retaining traces of the original facets ; the edges were 

 rounded, and elevated ribs were observed where the platinum 

 wire had prevented the free access of the gas. When the ex- 

 periment is allowed to terminate, and the oxygen is pure, all 

 the diamond is consumed, except a particle as large as a pin's 

 point which remains imbedded in the fused platinum. 



I conceive this experiment goes some way to account for 

 animal heat ; for if solid carbon, by merely dissolving in oxy- 

 gen to form carbonic acid, gives out so much caloric, there is 

 no difficulty in supposing carbon, in the liquid form of blood, 

 to give out caloric under the same circumstances. 



Bristol, 56 Old Market-street, Wm. Herapath. 



March 15, 1830. 



LVI. Letter from Mr. E. Galloway respecting the new Paddle- 

 Wheel, the Inve7ition of 'which is claimed by Mr. King 

 Williams : 'with Affidavits relating to that Subject. 



To Richard Taylor^ Esq. 

 Sir, 



HAVING a few days ago seen a Number of your valuable 

 publication, in which an improvement in propelling steam- 

 vessels is described as the invention of Mr. King Williams, I am 

 induced to trouble you with the inclosed copies of affidavits, 

 which will instantly show you the degree of merit belonging 

 to the claimant. These affidavits form but a small part ol the 

 evidence I possess on the subject. 



I am, Sir, most respectfully yours, 

 7 Holland-Street, Blackfriars, April 14, 1830. E. GaLLOWAY. 



Affidavits. 

 (Cop\.) 

 Benjamin Cliapman, Engineer, of Russell-Place, Bedford-Row, Borough 

 of Southwark, maketh oath, and saith, 

 That he was present during part of a conversation which took place in 

 November 1829, between Mr. E. Galloway and Mr. King Williams, when 

 the latter showed a model of a paddle-wheel, which he stated to be his in- 

 vention ; 



