342 



Description of a ne'jo Printing Press, 



equal in eflect to any hitherto constructed ; such as the Stan- 

 ho])e, Ruthven's, &c. for which patents have been taken out ; 

 and much superior in simpUcity of construction and cheapness, 

 which will recommend, we hope, its general adoption. It is 

 also easily made by any common blacksmith who is a good 

 workman. 



In the adjoining 

 figure, let ABCD 

 be the general frame 

 of the press, con- 

 nected by the cross 

 pieces NO, DC. E 

 is a centre connect- 

 ed with the frame 

 by the bars EN, 

 ER, EO. To this 

 centre are affixed a 

 bar KL, and a lever 

 EF, to which the 

 hand is applied 

 when the press is 

 used. 



Tliere are also several other pieces connected by joints at 

 N, G, I, K, L, M, O, H, which are so adjusted to each other 

 that when the hand is applied to the lever EF at F, by press- 

 ing it downwards KL is brought into a horizontal line or pa- 

 rallel to GH or DC, in which situation NIG, OMH, also 

 form each a straight line. It is evident from a long well- 

 known principle in mechanics, that the nearer these different 

 pieces, as above mentioned, are to a straight line, the greater 

 is the lever EF, in proportion to the perpendicular KS at 

 the other end of the lever EK, formed by a perpendicular 

 from K falling on FE produced. (Gregory's Mechanics, vol. i. 

 prop. 14'4. cor. 1.) — Consequently a small force applied at F 

 will be sufficient to produce a very great effect at K, when 

 I K, KE are nearly in a straight line, and so on, for the other 

 pieces above mentioned. 



Hence the force applied by hand at F must be very consi- 

 derable in forcing down GH, which slides on iron cylindri- 

 cal bars, or in pressing any substance placed in the aper- 

 ture PQ. 



Wherefore the whole theory and principles of the press are 

 apparent. I am, &c. 



Edinburgh, Oct. 1822. MechanicuS. 



1^" We think our Correspondent is not aware of the ad- 

 vantages 



