IMPLEMENTS, &c. OF THE FARM. 453 



Perhaps the best construction of this class of machines is that 

 of two plane rollers of large diameter, kept in rapid motion, the 

 grain to be bruised being supplied from a hopper, so as to pass 

 between them. The machines driven by hand, are convenient, 

 as being portable; but the labour of driving them is considera- 

 ble, and all the purposes of such machines may be served by 

 having the seeds coarsely ground in any common grain mill. 



APPARATUS TOR BOILING AND STEAMING FOOD. 



In numerous cases it is found to add to the nutritive proper- 

 ties of roots and grain, to boil them before they are given to 

 animals. The most economical method of preparation, is by 

 heating the water by means of steam, conveyed from the boiler 

 to the vessel containing the roots or grain. Any kind of 

 wooden box or barrel will answer the purpose, formed so as to 

 admit of being readily filled and emptied. 



The steam is to be conveyed in a pipe to the lower part of the 

 vessel, which ought to have a sliding board at the bottom to 

 allow the contents to be discharged when ready. The vessel 

 may be filled with water, though this is not necessary in the 

 case of succulent roots, as the potato, because the steam is 

 quickly condensed. But when corn is to be boiled, it should 

 be covered with water, that the steam may be condensed. 



The above figure represents a steaming apparatus of a suf- 

 ficiently good construction. A, is a barrel or other vessel for 

 containing water and supplying it to the boiler C. D is a safety- 

 valve. At the upper part of the boiler at C, are placed two 

 tubes, with stop-cocks. One of these tubes terminates near the 

 bottom of the boiler. Upon the stop-cock being turned, water 



