156 THE WATT AND THE TREVITHICK ENGINES. 



very much; we could hardly keep up the fire sometimes. I 

 reckon the steam was 30 or 40 Ibs. to the inch. Captain Dick's 

 boilers made him lots of enemies. I heard say in one mine 

 where he was trying his boilers against Boulton and Watt's 

 waggon, a lot of gunpowder was put into the heap of coal." ' 



The waggon or hearse Watt boiler was attached to 

 his 63-inch cylinder double, and the old man recollected 

 Laving raised the water cistern, wben Trevithick's globe 

 boiler gave an increased pressure in 1799, ten or twelve 

 years before the cylindrical boilers were made in Dol- 

 coath. 



" Some time after Captain Dick's globe boiler and .steam-whims 

 had been at work in Dolcoath, a letter came down from London, 

 saying that he would save the mine 100?. a month if they 

 would put iii one of his new plan boilers. 



" They were put in hand in the mine, and I worked about 

 them ; they were wrought-iron cylindrical boilers, about 20 feet 

 long, and 5 or 6 feet in diameter; the fire-tube was about 3 feet 

 in diameter; the fire returned around the outside in brick 

 flues. Three boilers were put in side by side. 



"When Captain Dick first tried them, lie said to the men, 

 Now mind, the fire-bars must never have more than six inches 

 of coal on them ; give a shovel or two to one boiler, and then 

 to another. When Captain Dick's back was turned, the men said 

 they wasn't going to do anything of the sort, there would never 

 be no rest for them. They used to say that the boilers saved 

 more than 170Z. the first month." 2 



Clark, when a boy, in 1799, helped to construct 

 Trevithick's globular boiler in Dolcoath, and recollected 

 the events of the few following years, during the con- 

 tests with tbe whim-engines about- 1806, and the intro- 

 duction of the large cylindrical wrought-iron boilers for 

 the pumping engines in 1811, and the struggle pre- 



1 Old John Bryant's statement in 1858. 



2 Clark's recollections in 1869, when he was eighty-three years old, and 

 resided at Redruth. 



