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Radiator Pics from Vancouver, BC
where I've spent some time with The Lovely Naoko. First are some huge American Peerless hot-water rads in the downtown train station. The pipes seem small for such big rads, and don't look like they've been changed- this may have been an early forced system:
And here, one of several small-tube rads on the RCMP (that's Royal Canadian Mounted Police) St. Roch, which patrolled the Arctic waters. It is now in permanent dry-dock in the Maritime Museum. This vessel is diesel-powered, and I believe the rads get hot water from the engine's cooling system. The wheelhouse and main cabin have rads, but the crew quarters has a stove for heat:
Following is a diagram of the boat:
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