New York [etc.] Simmons-Boardman Pub. Co. [etc.] · leaf 429
metal between them to makea tight joint. The gutta-percha is good when used indry places, but is softened in the presence of heat,and when such is present it is advisable to use eitherleather or some soft metal. Lead is almost too softto make a good joint, as it flows when subjected tothe pressure… … taining the ports lc;uliiii; to tliij cylinder of the ma-chine, which are intercepted by cup leathers locatedon the valve stem. The water under pressure pass-ing into the ports of the valve chamber and past theleathers, cuts them away badly, and requires theirfrequent renewal. Boiling the leathers…
Railroads · Railroad cars
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