nd Cast Iron Heads,” in is supplied with heated air by independent pipes; in the employ- circulating air; In Dancing Halls and Theatres.—Large sized which we spoke against the practice of placing boilers in nests ment of air tubes of com- fans can be so distributed as to make the air circulate… … to the chimney flue. Small clock weights, can be so arranged as to create a perfect cur air pipes are introduced rent of fresh air, dispelling all impurities. into the hot air flues and In the Southern States, East and West Indies, Mexico, into the pipes of the boiler, zi F, having aheit outer ends…
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