198 ENGINES FOR SOUTH AMERICA. 



pressure steam-engine is a cousin of mine, living within 

 a few miles of Falmouth, the port we are bound for." 

 On landing, Uville, still weak and obliged to keep his 

 bed, was told that Trevithick, the engineer, lived in 

 London, and was constructing the Thames Tunnel ; but 

 further inquiry showed that he also had suffered from 

 brain fever, and had just returned to Penponds, only a 

 few miles from Falmouth. On the 10th of May, 1813, 

 a letter reached Trevithick, requesting him to visit the 

 sick Uville, and in a fortnight from that time the en- 

 gineer had mastered the requirements of the Peruvian 

 mines, and had designed and made arrangements for 

 the supply of six pumping engines, together with the 

 pumps and all things necessary for the underground 

 workings ; the whole to be delivered in four months. 



[Rough draft.] 



SIR, " CAMBORNE, May 22nd, 1813. 



" I have engaged to get six engines, with pit-work, &c., to 

 send abroad. A great part of the wrought-iron work and the 

 boilers I have arranged for in Cornwall. These engines will be 

 high-pressure engines, because the place they are for has a very 

 deep aclit driven into the mountain ; and lifting condensing 

 water to the surface would be a greater load than the whole of 

 the work under the adit level. 



'' I call a set of work, a 24-inch cylinder single engine, 6-feet 

 stroke, piston, cylinder bottom, single nozzle, with two 5-inch 

 valves and perpendicular pipe ; no cylinder top ; the piston-rod 

 not to be turned ; 3-inch safety-valve, fire-door, two small 

 Y shafts and gear-handles, &c. ; a good strong winch set in a 

 broadish frame, such as is often used on quays or in quarries, 

 25 fathoms of 12-inch pumps, a 12-inch plunger, an 11-inch 

 working barrel, clack-seat and wind-bore, with brass boshes and 

 clacks, a force-pump for the boiler, and 10 fathoms of 3-inch 

 pipes to carry the water to and from the engines. I have 

 engaged to supply six full sets of the above-mentioned materials. 



