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Green
Fireplaces
Salubrity of Warm Rooms
And as the specific gravity of air is so very
small, compared with that of the dense solid materials
of which the walls, floor and ceiling of the rooms
are constructed, the warming of this air will not
sensibly cool the room.
Hence we see how easy it is to ventilate warm
rooms in cold weather, and also how impossible it
would be to live in such as room without the air
in it being perpetually changed andt replaced with
fresh and pure air from without.
_ Rumford in "Of the Salubrity
of Warm Rooms", Vol III, Collected Works, 1796.
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