THE SMOKE ABATEMENT EXHIBITION. 
233 
The grates and stoves may be conveniently described 
together. 
One of the chief features in the Exhibition is the Siemens 
gas grate, in which gas is used with coke or anthracite coal, 
and accomplishes its purpose perfectly, producing no smoke. 
A very bright cheerful fire is thus obtained, very different in 
appearance from most anthracite fires which do not burn so 
brightly as the bituminous coal fires. The largest part of the 
Exhibition is taken up with inventions whose object is to burn 
bituminous coal and consume the smoke produced. 
The means by which the various inventors have sought to 
consume, wholly or in part, the visible products of combustion, 
fall mainly into two classes. 
In the first class the object is attained by passing the 
products of combustion through the fire ; and, in the second, the 
result is arrived at by providing a supply of heated air, and 
causing it to meet the products of combustion as they leave the 
fire. 
Most of the exhibits belong to the first of the above classes,, 
viz., those in which the products of combustion are made to pass 
through or over the fire. This object is attained in various 
ways. Messrs. Brown and Green make the bottom of their 
grate, which is solid, project and turn up slightly, so as to hold 
the green fuel. This is pushed forward, as required, into the 
fire under the live coals, and consequently the inflammable 
gases given off from the green fuel are consumed in passing up 
through the fire. 
In Holland’s grate, which resembles in appearance an 
ordinary register stove, a handle at the side, when pulled, causes 
a rake-like set of bars to enter from the back between the fire 
bars underneath the ignited fuel. The continued movement of 
the handle raises the ignited fuel clear of the bottom of the fire 
bars, the space between being for the reception of fresh fuel. 
