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Steam engines
Been a very long time since worked on triples but with Stephenson gear on the wiper shaft was a link the allowed small adjustment to the position of the link motion so adjusting the cut off and hence power and steam consumption
If no tacho fitted speed was adjusted by looking at the Medium pressure cylinder steam chest pressure and the throttle v/v used to obtain the required pressure. Boiler pressure remained for all intense and purpose as constant as possible
stand to be corrected on the above.
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