Cyclopedia of heating, plumbing and sanitation; a complete reference work . ]:-. 80. Invincible Boiler, with SectionsSnperposiCourtesy of American /.?oii>,r Co. Fig. 81 .-hows another type of cast-iron heater which is not madein sections. The space between the outer and inner shells surround-ing the furnace is filled with water, and also the cross-pipes directlyover the fire and the drum at the top. The supply to the radiatorsis taken off from the top of the heater, and the return connect- at thelowest point. The ordinary horizontal and vertical tubular boilers, with variousmodifications, a
Cyclopedia of heating, plumbing and sanitation; a complete reference work . ]:-. 80. Invincible Boiler, with SectionsSnperposiCourtesy of American /.?oii>,r Co. Fig. 81 .-hows another type of cast-iron heater which is not madein sections. The space between the outer and inner shells surround-ing the furnace is filled with water, and also the cross-pipes directlyover the fire and the drum at the top. The supply to the radiatorsis taken off from the top of the heater, and the return connect- at thelowest point. The ordinary horizontal and vertical tubular boilers, with variousmodifications, are used to a considerable extent for hot-water heating, 105 96 HEATING AND VENTILATION ami an- well adapted i this class of work, especially in the case oflarge buildin Automatic regulators arc often used for the purpose of main-taining a constanl temperature of the water. They arc constructedin differenl ways some depend upon the expansion of a metal pipeor rod at different temperatures, and others upon the vaporization and consequent pres-sure of certain volatileliqu
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