BLOWER.
The Blower consists of a small pipe attached to the steam dome or top of the boiler with a globe or angle valve, and is situated near the stack. This pipe enters the stack just above the boiler, the end being bent up toward the top of stack and reduced to a very small opening. When steam is turned on through this pipe, it displaces the air in the stack, causes a partial vacuum in the smoke box, and the air rushes through the grates, fuel and flues to replace that which is blown out by the blower, and the draught can be increased as much as desired.