Equalization of Temperature, §c. 85 
tions. The air was admitted into the air chamber of the furnace 
from the basement rooms and hall where it was placed, and this 
air ascended into the parlors loaded with coal dust and other im- 
purities. This evil was entirely corrected by obtaining all the 
air for the supply of the air chamber from without the house. A 
large eight inch pipe was led from the bottom of this chamber 
through one of the walls of the house to the open air. This, 
besides obviating the difficulty above stated, ventilated our rooms 
with a constant supply of fresh air. The next objection was, 
that persons sitting in our rooms complaifed of cold feet, while 
in every other respect they felt comfortable. On examining the 
temperature of the air in the room at different heights, I found a 
variation of a degree for every foot. That is, at the height of 
six feet from the floor the thermometer stood six degrees higher 
than at the floor itself. This, then, was a very serious objection, 
and I set about immediately endeavoring to remove it. On re- 
flection, it occurred to me, that as our rooms were very tightly 
closed, having double sashes to our windows, the flues of the 
chimneys closely stopped, and the doors (made to fit tightly) gen- 
erally closed, that there was no way of escape for the air already 
in the room, when the furnace was set in Operation, so that it 
could not readily receive the addition of heated air, and none for 
the exit of the air after it had given out to the room its share of 
caloric received from the furnace. This cold air settled to the 
floor and there Jay almost stagnant. Here, then, was the root of 
the difficulty. ‘T'o remove it I adopted the following expedient, 
which proved entirely effectual. I led a pipe from the floor of 
each room to the bottom of the air chamber, and cut off all other 
supplies of air. The process of heating the air, then, was as fol- 
lows. That already in the chamber was heated and ascended to 
tee rooms above; to supply its place the cold air of the rooms 
s by the pipes which I had introduced and was in its 
turn heated and ascended ; thus keeping up a constant circulation 
of airin the rooms. I sfexswartl introduced a two inch pipe to 
supply fresh air to the chamber from without the house. This 
pipe had a valve, so that I could regulate the amount of air sup- 
plied by it. The effects of this improvement were, that there 
was a difference in temperature of only a degree and a half in six 
feet instead of six degrees as formerly, and we were no longer 
troubled with cold feet while sitting in these rooms. 
