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Peter Thomson
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6844. Thomson, P. March 16. Stopping tubes.- Stoppers for the tubes of marine boilers consist of a metal tube B screwed at both ends to receive rings C, D. Between each pair of rings is placed an india-rubber bucket E to which steam or water is admitted through holes in the ring C, and which is protected from heat by an asbestos washer F. Such stoppers allow of the passage of the hot gases through the damaged tubes, while preventing the escape of steam and water.
GB189706844D1897-03-161897-03-16An Improved Tube Stopper for Marine Tubular Boilers.
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