. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . and whenthe line is complete,the operator puts hisfoot upon a treadle,and by depressing itthe machine automat-ically justifies, aligns,compresses, and caststhe line, and releasesand d ep o s i t s theformed type bar in agalley. These opera-tions, in a foot-powerni a c h i n 0 , requireabout five seconds; nithe steam-power ma-chine, requiring one-eighth of a horse-power, the operationtakes but three sec-onds, during
. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . and whenthe line is complete,the operator puts hisfoot upon a treadle,and by depressing itthe machine automat-ically justifies, aligns,compresses, and caststhe line, and releasesand d ep o s i t s theformed type bar in agalley. These opera-tions, in a foot-powerni a c h i n 0 , requireabout five seconds; nithe steam-power ma-chine, requiring one-eighth of a horse-power, the operationtakes but three sec-onds, during whichtime the operator isgetting his line, sothat the work of themachine is practicallycontinuous. The justificationis accomplished by therotation of a rockingcomposite-disk of cir-cular form, which attheinitial point isthin-ner than a three-emspace. By the use of anoff-set in the type baritself, the justificationis done at the point ofcontact by the justi-fiers with the the sole use of the justifiers the spacing is made absolutely uniform, but by employing three-em spaces betweenshort words, un-uniform spacing may be had. Before commencing work, the frame carrying. Fig. 2.—The Rogers typograph. 874 TYPESETTING MACHINES. the various wires and matrix bars is swung down into f)Osition. with its front k^p resting ona base formed on the center shaft, as see^i in Fig. 3, and the compressing arm is swungto the left of the path of movement of the matrix bars ; the latter, by the key action men-tioned, form the line of composition in front of tlie mold, the latches retaining the matrixbars having their appropriate lips inserted between any two matrix bars by reason ofinclines on the latter, so as to cause the release from the latches of only llie proper matrixbars. When the desired line has been thus formed, the operator desists from further keymanipulation, and gives the treadle its primary stroke. This operates, first, to bring the compressing arm into position parallel wit
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Keywords: ., bookcentury1800, bookdecade189, booksubjectmechanicalengineering
