314 On Printing Presses and their Theory. 
are fifteen inches each in length; and i in the position repre- 
sented in the figure, which is that of the greatest obliquity, 
ey want two and a quarter inches at their point of contact 
of being straight. The lower end of each lever is we! inch- 
és broad, and is rounded off into a portion of a cylindrical 
sifacs of half‘ad inch radius. A piece of steel aed ‘within 
the circular projection in the middle of the platen has a hol- 
low bush or bod of corresponding figure: in this the lower 
end of the lever (17) isset. The upper end of this lever is 
‘ out in the same manner to receive the lower end 
of (6); and the upper end of (6) to receive a projection 
from the under side of the top of the frame. At (5) there 
is a provision for raising or lowering this projection by slips 
of sheet iron or tin, and thus adjusting the position of the 
levers to the best working state. The ends of the levers 
and the beds in which they rest are Rahn with steel, and 
the beds are so contrived as permanently to retain a small 
ual tity oil. (9) is a spindle of wrought iron fastened at 
2 ul ascrew and nutto the shorter arm of the 
AF 
a) 
ance lex er (7), and branching below into three parts, each of 
which is attached by an adjusting screw to the platen. This 
answers the double purpose of keeping the platen steady, 
and enabling the weight (18) attached to the longer arm 0 
the lever (7) to lift the platen and carry back the bar imme- 
diately after each pull. The platen is still farther guided 
by lateral projections which run in grooves connected with 
the cheeks of the press. 
The mode in which the movement of the working bar 
(12) is hein to the main levers, will be best under- 
stood ig. II. which is a representation of the parts 11, 
12,13 ind 15, as they woulda sige to te ace looking down 
upon the press from above. The b (the lever work- 
a} with the hand) is ane in a acne cast iron roll 
fee . ne 
of "which slides ina ets Bop uide (represented by 10, in 
pe. 1.) while the other end is Sfeaiaed by a hook and eye 
to the upper main lever (6), at the distance of an inch from 
