Application of the Principle of a Balance. 93 



holes at every sixth of an inch from end to end. This piece C D 

 is to be firmly inserted and fastened at right angles in the mid- 

 dle of the block A B. E F, ef, represent two similar, strong, 

 light thin, boards, a little curved from their centre, each five inches 

 long, three wide, and half or two thirds of an inch thick. H A, rep- 

 resent the handles, which can be formed in connexion with the boards 

 or attached separate. The boards are to have each, one mortise 

 cut through its middle of a sufficient size, for the easy and regular 

 motion of the ruler-like piece C D. Holes are to be made at right 

 angles through the centre of each of these mortises, correspond- 

 ing with those in the piece C D, so that by means of small pins or 

 screws, these boards E F, e/, can be movably hung nearer or far- 

 ther from the block A B, as required, o o o o, represent the spa- 

 ces between the block AB, and boards E F, ef, which the teats are 

 to occupy to be milked. The sides of the block A B, and the inner 

 sides of the boards E F, e f, are to be lined with leather or some 

 other soft substance, stuffed with cotton, &ic. so as to be elastic and 

 press easy against the teats and not injure them. This lining should 

 be harder and project farther, the nearer it comes to the upper sides 

 of these boards and blocks ; so that when the pressure is given, it 

 will commence at the upper parts of the teats and gradually increase 

 downwards, till all the milk is forced out. Instead of this stuffed 

 lining, springs, spiral wires, or some other elastic substance may be 

 used ; perhaps springs are best. To work this machine, it is to be 

 supported by the hands by means of the handles H h, in such a po- 

 sition, that the teats will hang down between the block and the boards 

 at o o o o, two teats each side of the piece C D. Both handles are 

 to be moved inwards and then outwards either fast or slow, so that 

 the operation of milking can be performed or regulated at pleasure. 

 When the handles are moved inwards, the two nearest teats to the milk- 

 er will be milked ; when moved outwards, the two farthest and thus 

 as the motions can be so quick, there will almost flow four streams, 

 till the operation is performed. Instead of communicating the press- 

 ure on the outside, it may be applied on the inside by altering the 

 construction a little. This machine is applicable to other purposes 

 allied to the operation of milking. The construction, dimensions, 

 weight and quality of the materials are variable, but the principle of 

 operation is the same.''^ 



* Having stated to the author some doubts as to this new process of milking, we 

 have received his assurance that he has proved it practicable, and that he desires its 

 publication. — Ed. 



