128 THE WATT AND THE TREVITHICK ENGINES. 



" MR. GlDDY, " PENYDARRAN, CARDIFF, January 6th, 1804. 



''.Sir, I received yours a few days since, and should 

 have answered it sooner, but I was at Swansea for the last 

 four weeks, and wished to return here to give you as full an 

 account of our proceedings as possible. 



" We have had an 8-inch cylinder at work here by way of 

 trial ; it worked exceedingly well a hammer of the same size 

 as is now being worked here by an atmospheric engine 28 

 inches diameter, 5-feet stroke, which does not master its work 

 witli greater ease than the 8-inch cylinder. The 8-inch is now 

 removed to Swansea, and is winding coals ; the baskets hold 

 6 cwt. of coal ; it lifts 80 yards in a minute and a quarter, and 

 burns 6 cwt. of coal in twenty-four hours. There were twelve 

 horses on this pit before, lifting 80 tons of coal in the course of 

 the twenty-four hours. You may fairly state that the 8-inch 

 cylinder does between thirty and forty horses' work in twenty- 

 four hours, with 6 cwt. of coal. 



" One of Boulton and Watt's 18-inch double engine, about half 

 a mile from it, lifting baskets of the same size, and with the 

 same velocity, burns above three times the quantity of coal. 



" The 8-inch engine requires the steam to be about 46 or 

 48 Ibs. to the inch to do its work well. The standers-by would 

 not believe that such a small engine could lift a basket of coal, 

 but are now much pleased with it, and have given orders for 

 several more. There will be another at work here for the same 

 purpose in about six weeks, a 15-inch cylinder, 6-feet stroke, 

 which is a great power for a winding engine. 



" Mr. Watt says, in a letter to Mr. Homfray, that he could 

 not make any of his experiments in strong steam answer the 

 purpose. It is my belief that he never made any experiments 

 of any consequence in strong steam. 



"A great number are building at different foundries. Mr. 

 Sharratt, a founder at Manchester, who has four in building, 

 said that he would not pay the patent right ; on giving him 

 notice of a trial he agreed to pay the patent right. 



" I have received a letter from London, saying that an en- 

 gineer called Dixon has two engines on the same plan working ; 

 and says that he shall not pay anything to the patentee ; that 



