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 … 136 DOUBLE-ACTING a screw-formed ring, compressed between the plates of the piston.The several convolutions of the screw are united by solder, un-til they are turned down to the proper dimensions. The sol-der is then melted off. The most perfect form of metallic packing is one in whichthe elastic…
Steam-engines
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