SHOP TOOLS . 11 I cut without changing the knives , or injuring an unnecessary number of adjoining links . Fig . 32 shows a general elevation of a Tweddell triple punching and shearing machine , capable of punching lJ - inch holes in l ^ - inch plates , or shearing 1 ^ - inch plates , or angle -… … Scol . c . * /t Tnchs — J VooU » jfieC , ■ • > * ■ ? . . < » ' „ Fig . 33 . vertical section of the punching - machine . A is the cylinder ; B is the piston , which is prolonged by an eccentric stem C , to which is attached the punch - holder D . The stem C , being
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