236 
THE SMOKE ABATEMENT EXHIBITION. 
becomes heated, and passing up to mix with the gases as they 
leave the fire, completes the combustion and prevents smoke. 
The success is certainly striking in this way. At South 
Kensington small coal ashes were being used, and yet even 
when the fuel was first put in there was no trace of smoke in the 
gas coming from the chimney. 
In the Greene stove the air is caused to pass through a 
pei forated tubular bridge passing across the fire ; this heats the 
air before it passes into the fire. 
Other grates in this class have the draught divided into two 
parts, one of which goes through the fire and the other over the 
top. The objection to this kind of grate is that the combustion 
is liable to take place in the chimney, and thereby the heat so 
generated is useless for warming the room. But frequently the 
chimney is surrounded by an air chamber to which air is 
admitted from the outside, and so warmed before passing into the 
room. 
The Miser stove deserves mention, for the exhibitors, 
Messrs. Yates, Hayw^ood, & Co., estimate the expense of it at 
from ^d. to Id. per diem. 
The design is good. When first lighted the smoke passes 
directly to the flue, but on a damper being shut, part of the 
draught passes through a series of openings in the back of the 
fire, and part over the top of the vertical combustion chamber. 
It then passes down to the bottom of the stove and up through 
pillars at the sides to the top. This it heats and then escapes 
into the flue. The combustion is good ; and, from the large 
amount of heating surface, most of the heat is given out to the 
room. 
Many other varieties of stoves were exhibited, which want of 
time forbids me to speak of. This section of the Exhibition was 
well represented, and although there was no stove which is of 
such surpassing merit as to ensure its immediate adoption to the 
