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I'm not sure, but one of the pages on the Semg website talks of blow-back being a risk which would suggest to me that it was hand-fired, as a mechanical stoker would usually have a cover plate of some sort surely? As for how the crew communicated I have no idea - something like a ship's telegraph would seem to be in order but there's no mention of such a thing. They may have relied on hand signals or whistle signals to co-ordinate.
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