Cyclopedia of heating, plumbing and sanitation; a complete reference work . 228 STEAM AND HOT WATER FITTING down-draft principle, the air being drawn down through the lire in-stead of passing upward in the usual manner. Coke Boilers. Coke is a popular fuel in some parts of the coun-. Fig. 5. Vertical Sectional Boiler. try; and certain makers are putting out specially designed boilersfor this service, having a very deep fire-box. Boiler Setting and Foundations. Brick setting of boilers, as

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