88 INSTRUMENTS OF HUSBANDRY. 



mills, should be able to compare the expence attending the 

 different sorts. 



Expence of the engine and house, L.325 



The threshing part, 100 



Total, L.425 



The drum and rollers are six feet long each. It has two 

 rakes, and two winnowing machines : The quantity of coals 

 sufficient to keep the engine going six hours, is from 20 

 to 24 bushels ; the work performed is from 1000 to 1200 

 sheaves per hour. 



It requires one man to attend the engine, in addition to 

 those usually employed, where water or wind is the power. 

 The expence of coals will vary according to circumstances ; 

 in this instance, 24 bushels cost about 10s. 



This engine was calculated to be equal to a five-horse 

 power, but will do more business than six horses, which, 

 requiring a driver, will balance the man attending the en- 

 gine, and of course the difference of daily expence, will be 

 between the value of 24 bushels of coals, and the labour of 

 six horses. 



Mr Thompson's machine was made by a steam-engine 

 maker at Newcastle, and any steam-engine wright can make 

 them There is little difficulty in managing them, no 

 more than for a colliery, and Mr Bailey thinks, much less 

 than those driven by wind. Steam also is a much steadier, 

 and a more certain power than wind or horses. The an- 

 nual expence of repairs, it is supposed, will be nearly the 

 same, at any rate will not much exceed that of a wind ma- 

 chine. I am informed, however, that a greater quantity 

 of oil and grease is required for a steam-machine, than any 

 other. 



