MODERN STEAM PRACTICE . 290 that it should be rolled in two directions to prevent delay ; and long and heavy bars can be thus rolled only by an engine of enor - mous power , such as the large combined engines we have described . A simple arrangement of rolls for working in two directions has been… … Fig . 196 . — Arrangement of Rolls for rolling in two directions . a a , Rolls driven from fly - wheel shaft . b b , Rolls driven from the fly - wheel shaft by a pair of wheels cc , Fig . 194 . in one heat , as it is impossible to get such large bars into the fur - nace to re - heat . In ordinary…
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