140 THE WATT AND THE TREV1THICK ENGINES. 



letter directed to him, to the care of Mr. Whitehead, Soho 

 Foundry, Manchester, will find him, as he will stay a little time 

 there, being very busy. I had lately the pleasure of writing to 

 you, and gave you the account of our engine working, and the 

 satisfaction it gives ; I have nothing more to add on the sub- 

 ject, but that it is now at work, going on as usual, and I should 

 be happy for you to have a sight of it. 



" We are beginning another of a larger size, and I have no 

 doubt but by making the cylindrical boiler larger, so as to take 

 a longer tube withinside it, by which means the fire will spend 

 itself before it leaves the tube to go up the chimney, that we 

 shall work to much better advantage in point of fuel than we 

 do at this present one, as this boiler is so short that a great deal 

 of the flame of the fire goes up the chimney. We are now 

 better acquainted with the different proportions than we at first 

 were, for which reason I am anxious that one now making by 

 Mr. Vivian should be made according to the directions of 

 Mr. Trevithick. 



"I beg leave to offer you the compliments of the season, and 

 many happy returns, and 



" Kemain, respectfully, dear Sir, 



" Your most obedient servant, 



" SAMUEL HOMFKAY." 



Trevithick, always busy, was just now doing the 

 work of a host, for everybody had to be taught how 

 to make high-pressure steam-engines ; and the New- 

 castle locomotive, the Thames steam - dredging, and 

 other special applications of steam-power required his 

 presence, especially the fight with Watt at Dolcoath 

 Mine, where Andrew Yivian, as mine manager, was 

 erecting a high-pressure steam-puffer whim-engine to 

 compete with a Watt low-pressure steam vacuum whim- 

 engine. 



" The adventurers grumbled because Captain Trevithick was 

 so often away from the mine. Glanville, the mine carpenter, 



