On grinding Maize in the Cob, ^c. 



supported her cow well through the whiter and spring, 

 until the return of grass. 



The screw of Mr. Evans's invention is set to re- 

 volve over a grate, fixed in the bottom of a hopper, 

 strongly made, and plated inside with iron. The corn 

 in cob is thrown into the hopper, and taken hold of by 

 the screw, and as fast as they are broken, they fall 

 through the grate, and are guided by a sloping spout 

 into millstones, or into an elevator, to be raised to the 

 millstone hopper. But it is improper to use the same 

 apparatus for both plaster and corn, on account of the 

 impossibility of cleaning it sufficiently on an emergen- 

 cy, when wanted to grind corn, from the dust of the 

 gypsum, which of course would mix with the corn 

 flower, and cause injurious concretions in the intes- 

 tines of the horse.* 



Explanation of Henry Dotterer's invention for breaking 

 Plaster of Paris, and Corn in the Ear, and shelling 

 Corn, and grinding Bark, and other hard substances. 



Fig. 1. Represents the machine in a frame, with a 

 wheel attached to the spindle, which may either be 

 connected to the bohing gears, or any other part of a 

 grist mill, as best suits, or may be turned by hand. A, 

 the hopper, which is of cast iron ; B, the frame in 

 which the hopper A is fastened by four screws, CCCC, 



* Such concretions have been formed in several horses in Penn- 

 sylvania, after having been employed for some time to turn a mill 

 for grinding plaster. 



