Appleton's dictionary of machines, mechanics, engine-work, and engineering . The cutting-tool is attached to the bar i, in which a rack is cut, into the teeth of which n pinion geers,which pinion is moved by a perpetual screw on the bar; by this arrangement the vertical motion isgiven to the tool. The method ot producing the lateral motion of the tool by the screw /» is shown bythe figure, and does not need explanation. Fig. 2557, H, cross-bar and bearing for upper end of shaft of chuck-plate. 206 LAP AND LEAD OF THE SLIDE-VALVE. 2559. LAP AND LEAD OF THE SLIDE-VALVE. The slide-valve is
Appleton's dictionary of machines, mechanics, engine-work, and engineering . The cutting-tool is attached to the bar i, in which a rack is cut, into the teeth of which n pinion geers,which pinion is moved by a perpetual screw on the bar; by this arrangement the vertical motion isgiven to the tool. The method ot producing the lateral motion of the tool by the screw /» is shown bythe figure, and does not need explanation. Fig. 2557, H, cross-bar and bearing for upper end of shaft of chuck-plate. 206 LAP AND LEAD OF THE SLIDE-VALVE. 2559. LAP AND LEAD OF THE SLIDE-VALVE. The slide-valve is that part of a steam-enginewhich causes the motion of the piston to be reciprocating. It is made to slide upon a smooth surface,called the cylinder face, in which there are three openings to as many pipes or passages : two for theadmission of steam to the cylinder, above and below the piston, alternately; while the use of the thirdis to convey away the waste steam. The first two are, therefore, termed the induction or steam ports,and the remaining one the eduction or exhaustion port. The slide is inclosed in a steam-tight case, called the slide-jacket; and motion is communicated toit by means of a rod working through a stuffing-box. The steam from the boilei enters the jacket, and thence passes into the cylinder, through eithersteam port, according to the position of the slide, which is so contrived that steam cannot pass from thejacket to the cylinder through both steam ports at the same time, or through the eduction por
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Keywords: ., bookcentury1800, booksubjectmechanicalengineering, bookyear1861
