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 . otting-pid to preventoffset when the face of the freshly printed sheet is carried on toit from cylinder d The inking-roller*, not shown in this view,are kept constantlv in contact with the tvpe or plates on cylin-ders e f. The eripper^ are so arranged thnt the delivery of asheet from one set to auotlier is certain and uniform. B shows the cutting and receiving c
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 . otting-pid to preventoffset when the face of the freshly printed sheet is carried on toit from cylinder d The inking-roller*, not shown in this view,are kept constantlv in contact with the tvpe or plates on cylin-ders e f. The eripper^ are so arranged thnt the delivery of asheet from one set to auotlier is certain and uniform. B shows the cutting and receiving cylinders, with the grip-pers on the latter in their positions before and after the sheet iscut from the web C shows the knife x and carrier n, and theslotted block m, into which the cut is made The carrier n Isa se done are of extraordinary thickness,and are cist to fit the cylinders in circular molds. The moldsare made in plastic material spread on a steel plate which ispressed flat, but which assumes a circular shape when released, PERFORATED-FILE. 1668 PERISCOPIO LENS. Fis. Bullock Press (^Principle of Action). curving the mold with it Kellbergs arrangement of tlie Bullockpress cuts the sheets after printing. The Victory press, shown under ,is also a v:eb-p>vss, and daniiis, , cuts, folds,and at the back a Si-pagc! paper like theChristian Union of New York, at the rate of 7,000per lioiir. Perfo-rated File. A Ilh invented liy HiramPowers, haviuf^ openings through which the abradedmaterial is allowed to escape. It is especially in-tended for sculptors use. Perfo-rated Savsr. One having a series ofapertures beliind each gum of the teeth, as originallynia<le. These serve to prevent fractures at the basesof the teeth, and lessen the amount of filing lequired,becoming themselves the gums after eacli Perfo-rating-ma-chine. 1. (Miniiui.) Therock-drilliug machine used in tnnn(ding. See Tun-nel ; , etc. Th
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Keywords: ., bookcentury1800, booksubjectin, booksubjectmechanicalengineering
