let into the piston , which prevents the steam escaping through the trunk into the atmosphere ; while in the double - trunk engine the crosshead is secured by bolts which pass through snugs cast along with the trunk , and do not require to be made steam - tight , as in the preceding case . The… … Fig . 293 . — Connecting - rod End for Cranked Shaft . a , End forged on the piston rod . b , Cap . cc , Bolts and nuts . d , Brasses . head and cranked shaft is that with solid ends forged on , slotted out for the reception of the brasses , with caps of wrought iron secured by two large bolts .…
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