96 



Application of the Principle of a Balance. 



follower is attached the piston P p, which is exactly fitted to move 

 up and down in the cylinder T so as to prevent the escape of air or 

 water. The pressure of this press is given between the follower JVw 

 and the side of the frame C. E F, ef represent two hollow pipes, 

 whose lower ends are tightly inserted into the cistern W. V v, two 

 valves that exactly cover the lower ends of these pipes, and open suf- 

 ficiently into the cistern. R the pivot of the operating lever, which 

 connects the top of the pipes. L I the operating lever. H. its han- 

 dle, li, two rods that move up and down in the pipes, whose up- 

 per ends are movably hung to the lever L I, and to whose lower 

 ends are attached wheels or pistons with valves in their centre, open- 

 ing downwards, exactly fitted to move up and down, and not allow 

 the escape of air or water. To give the pressure either by air or 

 water, it is admitted into the lop of the pipes, passes through the 

 valves in the wheels and the valves V v, until the cistern is full ; the 

 handle jffis then to be worked, and the water or air will force down the 

 piston P p, and consequently the follower JV n, and press whatever 

 is between it and C. To take off the pressure, the air or water can 

 be let out of the cistern. Pistons might be used in the pipes. This 

 press is susceptible of numerous modifications and applications. 



7. Application to Printing. 



Fig. 5 represents a printing ma- '^' ' 



chine. A represents an oblong table 

 or frame, set full of types and balan- 

 ced on its axle E e, which supports 

 it at a a, movably in two upright stan- 

 dards. H represents the operating 

 handle. M a heavy or solid, oblong, 

 triangular block, as wide and long as 

 the table; over which it is to be firm- 

 ly hung, so that one of its angles will 

 run parallel and laterally with its axle E e. The two sides of the 

 block M, immediately over the types, or against which they will press, 

 when the handle iJis operated, must be lined with some elastic sub- 

 stance, in order to give a good impression. The types are to be ink- 

 ed by inking rollers, and the paper applied by hand or machinery. 

 Instead of the table's being movably hung and the block fixed, it may 

 be reversed ; the table fixed and block movably hung. Instead of 

 the block being triangular and table flat, the block may be flat and 

 the table triangular. Every motion of the handle H, either upwards 

 or downwards will give an impression. 



East Nassau, Rensselaer Co., N. Y., April 28, 1834. 



