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This was covered by a piece of wood and a patch of concrete on the interior brick wall of our brownstone apt. It appears to be made of a thin metal, with a curved interior, and slots leading above and below. It is nearly a foot high,
about a foot off the floor, and 3 feet from the fireplace.

Any idea what it was for? In case this matters, it’s on the third floor of a Brooklyn brownstone built in the 1870′s.

Thanks!