THE WATT AND Till-] THKVITIIICK ENGIXKS. 18!) 



76-inch engine of 1816, working with about the same 

 steam pressure and degree of expansion. The valves, 

 gear, and nozzles were perhaps improved in detail ; but 

 the groundwork was unchanged. The first high-pres- 

 sure steam Cornish pumping engine made in France 

 was designed and superintended by the writer at the 

 works of Messrs. Perrier, Edwards, and Chaper, at 

 Pompe-a-feu, in Chaillot, a suburb of Paris. The prin- 

 ciple was the same as the Dolcoath engine, and the 

 detail differed but little from it or the Wheal Towan, 

 except that its exterior was a little more artistic than its 

 prototypes in Cornwall, in keeping with French require- 

 ments. It was built in 1836, within a few yards of the 

 low-pressure steam pumping engine erected by Perrier 

 and others in 1779, which still continued pumping water 

 from the Seine for the supply of Paris. Stuart says, 

 " An engine by Boulton and Watt was sent to France, 

 and erected by M. Perrier at Chaillot, near Paris. The 

 French engineer, Proney, with a detestable illiberality, 

 attributes all the merit of the improvements in the 

 Chaillot engine to his friend Perrier, the person who 

 merely put together the pieces he had brought from 

 Soho." 1 



The Perrier of 1779 was related to the Perrier of the 

 Pompe-a-feu engine-building works of 1836, and his 

 nephew took the Trevithick engine from Paris to a coal 

 mine not far from Brussels, but not fully understanding 

 the use of the balance-bob the woodwork for which had 

 not been completed in Paris, though all other parts had 

 been fully erected did not find it easy to manage the 

 engine. The writer viewed Perrier's move as an in- 

 fringement of the agreement between, him and Edwards, 



Stuart 'On the Steam-Engine,' ]>. Ml. 



