116 Account of a new Pummice Press. 



A, An iron pin 1 1-2 inches thick, passing through 

 both uprights, against which the toe of the lever presses 

 upwards, and an eye boh passing through the lever, 

 which keeps the lever from falling, when the blocks are 

 removed. 



B, B, B, Holes in the upright, to which the lever 

 may be removed at pleasure, to any required height. 



C, C, A similar tenon and dove tail at the other end 

 of the side planks, bearing upwards. 



C, A tenon with a dove tail, bearing downward, to 

 strengthen and bind together the side planks and up- 

 rights. 



D, This dotted line shews the foot of the upright, as 

 it extends forward within the side plank. The upright 

 is secured by a pin represented by a . near D. 



E, The cribb, 21 by 20 inches, and 20 inches high. 



F, Plank side of the cribb. G, Wedges. 



H, Side plank lying on the out side of the upright, 

 7 feet 4 inches long from out to out. 



1, 6 feet 8 inches, equal to five times the length below 

 the fulcrum. 



K, 6 feet 8 inches. 



L, A wedge over the plank side of the cribb not 

 really necessary. 



Though the cribb contains only four bushels, yet the 

 press is equal to a cribb of 48 by 48 inches, and 36 in- 

 ches high, which will contain 37 bushels. The facility 

 with which that quantity can be pressed, discharged, and 

 replaced, leaves no doubt but that a much greater quan- 

 tity in a day can be pressed, than is practicable with the 

 longest beam hitherto ever used; or with the best double 

 screw press, now in use. The plank being prepai'ed, it is 



