440 



OILS 



K (fig, 1576), a lever for lifting up the agitator or stirrer E. c, a catch for holding up 

 the lever K, when it has been raised to a proper height. 



A patent was taken out in May 1849, by Messrs. Bessemer and Hey wood for a 

 machine to be used for expressing oils from seeds. Fig. 1580 is a drawing of it. 

 The bed-plate of framing, a, which should be cast in one piece, forms, at a 1 , a cistern 

 for the reception of the oily matters which fall therein as they are expressed. At the 

 opposite end of the bed-plate there are formed projections a 2 , in which brasses, b, are 

 fitted, and with the caps, c, form bearings for the crank-shaft, d, to turn in. There 



1576 



A 



._JD 



1579 



are also two other projections, a 3 , a 3 , cast on to the bed-plate, and are provided with 

 caps, e, in a similar manner to the caps of plummer-blocks. These caps are for tho 

 purpose of retaining firmly in its place the pressing-cylinder, /, which should be 

 made of tough gun-metal, and of such thickness ns to bo capable of. withstanding a 

 considerable amount of internal pressure. Within the cylinder, f, is fitted a lining, 

 which consists of a gun-metal tube, n, having a spiral groove, r, cut on the outside 

 of it, and presenting the appearance of an ordinary square-threaded screw. At very 

 short intervals all along tho spiral groove there are conical holes, s, drilled through 

 the tube n, and communicating with tho interior of it. At n 1 the inside of the tube is 

 enlarged, and is provided with a steel collar, t. The opposite end of the tube at ' 

 is reduced in diameter, and is provided externally with a steel collar, . A plain 



