An Admiralty Three-Drum variant of the Yarrow boiler. Version without water tubes or superheater tubes to reduce file size, but water, steam and superheater drums are included, as are the external downcomer tubes and main steam pipes. Uptakes above boiler not included (they'd lead up from the rectangular spaces either side of the steam drum). #Admiralty_boiler #Admiralty_ThreeDrum_boiler #boiler #boiler_kinds #boiler_types #boilers #designs #engine #engines #engines_and_machinery #machinery #mechanical #mechanical_things #old #ship #ships #steam #steamship #threedrum_boiler #Yarrow #Yarrow_boiler
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