VARIOUS INVENTIONS. 15 



other purpose, as any large quantity of water would be but 

 slowly heated. 



" I find that it does not answer either the purpose of the 

 vendor or the user of an engine, to make less than a 2-horse 

 power, as the expense on a very small engine is nearly as much 

 as one of the power I use for thrashing, those being only 80?., 

 and a 2-horse is 60Z. Respecting the mashing with steam, I 

 never before heard of it, but from the theory of the plan I think 

 it cannot fail to answer a far better purpose than any other that 

 can possibly be applied for extracting the essence of the malt. 

 However, should it not answer your purpose, it is only the loss 

 of the expense of a few yards of 1-inch lead pipe. 



" In an engine of the size used for thrashing, if the fire is 

 kept brisk, it will boil, by the steam sent into a separate vessel, 

 near 300 gallons of water per hour. 



" The room required to work in is about 7 feet diameter, and 

 12 feet high. It would be useless to put you to the expense of 

 drawings, until you have made up your minds on what you 

 intend to have done. 



" I remain, Gentlemen, 



" Your most obedient humble servant, 



"RiCHAKD TREVITHICK. 



" To ROBINSON AND BUCHANAN, Brewers, 

 " Londonderry, Ireland" 



Engineers of the present day do not volunteer such 

 general information without charge, or give such a 

 variety of practical mechanism slightly but clearly 

 described, and principles reduced to practice. An 

 endless chain with buckets is a form of water-wheel 

 not then in use. A water-pressure engine for so small 

 a quantity of water, with a fall of about 30 feet, 

 would cause a loss of 50 per cent, from friction and 

 small defects. The non-elastic character of water 

 made it unsuitable for a machine requiring a fly-wheel. 

 Air-vessels should be used to lessen the rigidity of 



