314 apparatus rem triturating mercury, &c. 



Description of Perpendicularly to each side of this segment is fixed an 

 the apparatus, actional piece of iron, B, by screws or otherwise; and 

 another piece at each end, C, D, inclining in the direction 

 of the radius of the circle; so as to stand above it about 

 four inches, and form a box or trough. This may be made 

 to stand on legs, or be fixed securely in any simple framing, 

 at a height most convenient for the person that works or 

 attends the machine. 



A wrought iron pallet, E, is to be fitted accurately into 

 the box, reaching from one side to the other, allowing it 

 only sufficient space to work easily backward and forward. 

 The lower end of the pallet is to be made to fit the bottom 

 of the box ; but its lower edges must be rounded off con- 

 siderably, so as to rise over the matter in the box, and not 

 drive it all before it. Its shape is more particularly seen at 

 Figs. 2 and 3, which are on a somewhat larger scale, Fig. 2 

 being the front, and Fig 3 the side view of it. 



This pallet is to be affixed to the end of a vertical shaft 

 or rod, F, measuring four feet from the extremity of the 

 pallet to the pivot, G, on which it turns. The top of the 

 rod may be secured by working through a chaff mortice, 

 which will allow it to move backward and forward, but not 

 admit any lateral motion. 



The piece, H I, in which this mortice is made, is fixed 

 to a cross piece between the uprights, K, L, Fig. 5; one 

 of which only, KK, is seen in this view: and as this cross- 

 piece moves on a pivot at each end, though it is prevented 

 from moving horizontally, it is confined vertically only by 

 a weight at the extremity ; which weight may be greater or 

 less, according to the degree of pressure or friction re- 

 qnired. Instead of the weight, a wooden or other spring " 

 might be made to act on the head of the shaft at G; but in 

 general a weight will be found preferable. 



The pallet is set in motion by means of a rod M; one 

 extremity of which is attached to the vertical shaft at F, 

 where it works on a pin; the other by coupling brasses to 

 the crank, N, in the axis of a fly wheel, -O. A perpen- 

 dicular view of these parts, with the same letters of refe- 

 rence, is given at Fig. 5. The place where the rod, M, is 



must be so proportioned 

 to 



