A large opening is
to be made into the warm-air fine, and through this the kitchen
stove-pipe is to pass, and be joined to the cast-iron chimney-pipe.
Thus the smoke of the kitchen stove will warm the iron chimney-pipe,
and this will warm the air of the flue, causing a current upward, and
this current will draw the heat and smells of cooking out of the kitchen
into the opening of the warm-air flue. Every room surrounding the
chimney has an opening at the top and bottom into the warm-air Hue for
ventilation, as also have the bathroom and water-closets.
[Illustration: Fig. 30.]
The writer has examined the methods most employed at the present time,
which are all modifications of the two modes here described. One is
that of Robinson, patented by a Boston company, which is a modification
of the mining mode. It consists of the two ventilating tubes, such as
are employed in mines, united in one shaft with a roof to keep out
rain, and a valve to regulate the entrance and exit of air, as
illustrated in Fig. 30. This method works well in certain circumstances,
but fails so often as to prove very unreliable. Another mode is that
of Ruttan, which is effected by heating air.
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