It consists, in fact, of a series of trapezia! ladders, made of light frames, and capable of enclosing a circle at the base of 30 feet, ... At the ends there is a small loor for charging and drawing. ... When the fire is first started all air-holes are shut ; when it is fairly caught the chimney may be filled up with dry wood, the hole closed, but not tightly, and air- holes opened at the ends. ... By volume a cord of woodanbsp;...
|Title||:||Appletons' Cyclopædia of Applied Mechanics|