Knight's American mechanical dictionary : a description of tools, instruments, machines, processes and engineering, history of inventions, general technological vocabulary ; and digest of mechanical appliances in science and the arts . n, the center of whose upper sur-face has a cup which rests against the lower end ofthe screw-heail; the four corners of the platen Lieiugtastened by thongs to the screw-head, so as to giveit a certain inde[iendenee of adjustment, to enableit to lit against the face of the form, that is, to as-sume parallelism therewith. The form rests on thebed and is seeuied i
Knight's American mechanical dictionary : a description of tools, instruments, machines, processes and engineering, history of inventions, general technological vocabulary ; and digest of mechanical appliances in science and the arts . n, the center of whose upper sur-face has a cup which rests against the lower end ofthe screw-heail; the four corners of the platen Lieiugtastened by thongs to the screw-head, so as to giveit a certain inde[iendenee of adjustment, to enableit to lit against the face of the form, that is, to as-sume parallelism therewith. The form rests on thebed and is seeuied in position by tenipitr bed runs in and out on a tractk ; a rack on theunder side of the bed being engaged liy a pinion onthe shaft beneath, which is rotated by a platen is only large enough to cover one halfthe beil, and in printing a newspaper it was neces-sary to screw down the platen on each page, runningthe bed forwaid or liack between ^lit/fe This may be taken as a sample of the press in useuntil the advent, late in the eighteenth century, ofLord Staidiopes improved press, which so longmaintained its position and has so familiar an ap-pearance. The oscillating hand operates a toggle to Fig. force down the platen upon the paper on the form,and the platen is raised again by a spring when theforce is withdrawn. The bed travels on ways, andthe frisket is hinged and is so jointed as to lie backin an elevated position when raised for the purposeof withdrawing the sheet, inking the type, ami pla-cing a sheet thereon. The Columbian hand-press was invented by GeorgeOlynieiof Philadelphia, who completed his inventionabout 1817. The Columbian press was ennsidereds\iperior to Stanhopes. The imwer is applied to theplaten by a compound lever, consisting of three sim-ple levers of the second order. This press is inter-esting as being the first important American addi-tion to the art of printing. Peter Smiths hand-press soon succeeded the as a
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Keywords: ., bookcentury1800, booksubjectin, booksubjectmechanicalengineering
