POLK STKAM-KXMNK. 99 



and intends to call on you at Dolley's as soon as he arrives. I 

 do not know that the agreement matters much for a few days 

 up or down. The terms are well understood between us, which 

 is that the adventurers and I equally share the advantages 

 that may arise from this new engine over Boulton and Watt's. 

 When you have fully arranged with your adventurers about the 

 engine, please to write me, and I will immediately proceed 

 to order the engine ; and in the interim the agreement will be 

 drawn up by Mr. Page, and executed either here or in London, 

 just as may suit. 



" I remain, &c., 



"B. TKEVITHICK. 



"P.S. Herland engine goes on better and better. Your 

 adventurers will get a satisfactory account by applying in town 

 to Mr. Win. Phillip, No. 2, George Yard, Lombard Street. He 

 is the principal of the London adventurers." 



Trevithick believed that mine adventurers would 

 agree to pay him one-half the saving caused by his 

 engines, as compared with the cost of fuel in the Watt 

 engine. The duty performed by the latter was under- 

 stood and agreed to generally ; persons were chosen by 

 the adventurers to experiment and report on the duty of 

 Trevithick's pole-engine, that the amount of payment 

 might be ascertained in proportion to the saving effected. 



' ' ME. GlDDY, " PENZANCE, Ap, il 2, 1816. 



" Sir, I have long wished to write to you about the 

 Herland engine, but first wished to see the engine loaded with. 

 a second lift, and a trial made of the duty. Yesterday was 

 fixed on, before ordering another engine for the eastern shaft. 



"The persons attended. The arbitrators gave the duty as 

 forty-eight millions, and said they had no doubt the engine 

 would perform above sixty millions before getting to the bottom 

 of the mine. 



" They were much within the duty, but I did not contend 

 with them, as they said it was quite duty enough. 



H 2 



