prevents any escape of steam through the apertures thatare thus made in either of the rings. The annexed figure shows this arrangement, where a is thepiston-rod. b, b, b springs that press against the joints c, c, c ofone of the rings, which is here represented as formed by in-scribing an… … In applying a metallic piston, accuracy in the boring is ab-solutely essential, nor can they be introduced except when thispart of the workmanship is of the best description. Another form of metallic packing, which is represented be-neath, has been used in locomotive engines. It is composed of
Steam-engines
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