THE WATT AND THE TREV1THICK ENGINES. 133 



the engine might be worked to its full power. The saving of 

 coal would be very great by working expansively. 



" The trials we have made for several weeks past against 

 Boulton's engines have been by working with the cylinder full 

 of steam. The cock springs out of its seat when water gets 

 into the cylinder, and prevents any mischief from the velocity 

 of the fly-wheel. 



"The tram-engine lias carried two loads of 10 tons of iron 

 to the shipping place since you left this. Mr. Hill says he will 

 not pay the bet, because there were some of the tram-plates in 

 the tunnel removed so as to get the road into the middle of 

 the arch. 



" The first objection he started was that one man should go 

 with the engine, without any assistance, which I performed 

 myself without help ; and now his objection is that the road is 

 not in the same place as when the bet was made. 



" I expect Mr. Horn fray will be forced to take steps that will 

 force him to pay. As soon as I return from here there will be 

 another trial, and some person will be called to testify its 

 effects, and then I expect there will be a lawsuit immediately. 

 The travelling engine is now working a hammer. 



" At Worcester last week we put a 10-horse engine to work 

 in a glover's manufactory. The flue from the engine is carried 

 through the drying room and dries his leather. The steam from 

 the engine goes to take the essence out of the bark, and also to 

 extract the colour out of the wood for dyeing the leather. Then 

 it boils the dye, and the steam that is left is carried into his 

 hot-house. It works exceedingly well. This week I put another 

 to wind coals at this place, a 10-horse power, which works very 

 well. All the tradesmen are set against it ; they say that there 

 is no carpenter or mason work about it, and very little smith- 

 work, arid that it will destroy their business. The engineer on 

 the spot is also against it very much. 1 do not expect that it 

 will be kept long at work after I leave it, unless the proprietor 

 takes care to prevent those people from doing an injury to it. 

 Mr. Homfray was here yesterday, but is now returned to Peny- 

 darran. I shall go from here to Coalbrookdale. 



" There is an engine there almost ready for the West India 



