Printing; a practical treatise on the art of typography as applied more particularly to the printing of books; (1890)
Jacobi, Charles Thomas, 1853-1933 · London : G. Bell and sons · leaf 284
given, the sides of the press, as likewise itshead, must be of gieat strength, and, as a matter of course,made of iron. When it is pumped up and the requiredpressure exerted, it is held by fastening a valve, andif the press is in good order the power is retained aslong as required. By unscrewing… … Fiff. 146. which will take, say, double demy. If the leather collar ofthe piston gets worn, it will cause a leak and the pressuregives. A dial indicating the tonnage is sometimes attachedto these presses, and is a guide in pumping up. The example 260 FEINTING. given is one witli double pumps…
Printing
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