THE WATT AND TIIK TliKVITIIICK ENGTNKS. 1^9 



in Dolcoatb sett, and the Boulton and Watt 63-inch cylinder 

 double-acting. 



" There used to be great talking about different boilers ; a 

 boiler of Captain Trevithick's worked with higher steam than 

 the others. Just before Captain Dick came back to the mine a 

 Boulton and Watt hearse boiler had been repaired with a new 

 bottom ; it was never used. I and William Causan took a job 

 to cut up the boiler at Is. Qd. the hundredweight ; it weighed 

 17 tons. Jeffrie and Gribble were the mine engineers ; Glan- 

 ville used to be considered Captain Dick's man in the mine. You 

 could stand upright on the fire-bars in the middle hollow of the 

 hearse boiler, and so you could in the outside brick flues ; the 

 middle hollow was like a horse-shoe. When Captain Dick put in 

 his cylindrical boilers he altered the 63-inch single ; there was 

 hardly anything of her left but the main wall, with the wood 

 bob and a chain to the piston-rod, and also to the pump-rods. 

 There was an air-pump, and I think a second-hand cylinder was 

 brought, but it was a 63-inch ; the old Shammal engine had 

 been altered, too. 



" The new boiler put in was about 8 feet in diameter and 

 from 30 to 40 feet long, two round tubes went through it ; the 

 fire-place in one end of one tube and in the other end of the 

 other tube ; after going through the tubes the draught went into 

 the brick flues under the bottom and sides. When the new 

 engine was put in, Gribble said, * Why, these little things will 

 never get steam enough ; ' everybody said so. 



" In the Boulton and Watt engines we didn't trouble about 

 feed-pumps and gauge-cocks: 



" A wire came through a stuffing box in the top of the boiler ; 

 a biggish stone in the boiler was fastened to one end of the 

 wire, the other end was fastened to a weighted lever near the 

 water cistern, just above the boiler; when the water got low the 

 stone opened the valve in the water cistern. That was when 

 they were putting in Captain Dick's new cylindrical boilers to the 

 old 63-inch engine. She did so much more work, with less 

 coal, that in a year or so they agreed to throw out Boulton and 

 Watt's engine, and to put in a stronger one that could stand 

 Captain Dick's high steam. Jeffrie and Gribble were the mine 



