"Four such trenches radiating from a common central chimney will give one flue for use whatever may be the direction of the wind." — Moss, 1914

Camp chimney

"Four such trenches radiating from a common central chimney will give one flue for use whatever may…

"A still greater economy of fuel can be effected by digging a similar trench in the direction of the wind and slightly narrower than the diameter of the kettles. The kettles are then placed on the trench and the space between tthe kettles filled in with stones, clay, etc., leaving the flue running beneath the kettles. The draft can be improved by building a chimney of stones, clay, etc., at the leeward end of the flue." — Moss, 1914

Camp kitchen

"A still greater economy of fuel can be effected by digging a similar trench in the direction of the…

This illustration depicts a flue damper used to serve as the valve mechanism which restricts home smoke access.

Flue Damper

This illustration depicts a flue damper used to serve as the valve mechanism which restricts home smoke…

"A very powerful and economical one, for large establishments especially. It is a modification of the well-known Cornish boiler, and consists of two wrought-iron cylinders substantially rivetted together, and having a water space of about 2 inches between them. The frame for the furnace doors d is attached to the front. It is supported by two cast-iron chairs a, a, the front chair forming the frame for the lower flue doors b, which fasten by a simple catch, and can readily be lifted off for cleaning the flues. The plug c, opened by unscrewing it, is for the purpose of clearing out all interior accumulation of dirt, which should be done thoroughly at short intervals. The flow pipe is at e, the return at f." — Encyclopedia Britannica, 1893

Trentham Boiler

"A very powerful and economical one, for large establishments especially. It is a modification of the…