B. Silliman, Jr., on the Combustion of Wet Fuel. 251 
fuel, will be vastly greater than from the same quantity by measure of 
the same fuel when dry. In the fire chamber and in the mixing cham- 
ber under intense heat the carbonaceous gases will decompose the steam 
In the drawings, D represents the chambers for the dry fuel, W those 
for the wet, Jf the mixing chamber, the dotted line m in Fig, 3 limits it 
; ° r, . . 
the efficiency of the furnace depend greatly upon it. The principal ob- 
ject of this chamber is to give the combustible carbonaceous gases from 
chamber be too small to receive these gases as fast as the furnace is able 
to produce them the operation will of course be choked and impeded. 
Ifthe chamber is larger than can be kept densely filled with these gases, of 
Will at once greatly increase the volume of gases to be sent whe to 
Ma and proportionably decrease its temperature; and when the 
and nitrogen, will go forward, thus wasting the fuel and imparting 
uly @ faint degree of heat to the boiler. eh 
Thave therefore fixed the size of the mixing chamber by many care- 
ful *xperiments—and that given above will produce the desired effect with 
