, by the screws which unite the twopieces of which the piston is composed. As the packing wears,the screws are turned, and thus the packing, being again com- CONDENSING ENGINE. 133 pressed, is forced out, and again applies itself to the cylinder.This arrangement may be better understood by the… … 87. An ingenious mode of tightening the packing withouttaking off the lid of the cylinder, was invented by Woolf. Thehead of each of the screws is cut into the form of a toothedpinion, and the teeth of all these work in a wheel, having afree motion around the piston-rod. It is. therefore, evident…
Steam-engines
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