ced over the tube when in Posi tion , it is screwed up , then the cone is forced through the india rubber and expands it for the reception of the tube ; in this way the ring is spread out , tightly filling the recess , and binding the tube firmly ; the nut is screwed hard up on the tube plate ,… … ing surface now falls to be noticed . 1 % . 312 . — Packing Ring for Tubes . When the water passes through the tubes and the steam all around them , we obtain a larger amount of surface than when the steam is Condensed inside of the tubes ; but in the former case any incrus - tation that takes…
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