Greenhouses, their construction and equipment . ter heating 216 GREENHOUSES the boiler is fitted with an altitude gauge,which shows the height of the water in thesystem; also with a thermometer to show thetemperature of the water. A valve is pro-vided for draining the boiler and, if desired,an automatic damper regulating device maybe installed. When used for steamheating the boiler is onlypartially filled with water,and a water column andguage is necessary to indi-cate the height of thewater. A steam guage isalso necessary to indicatethe pressure; and a safetyvalve to automatically re-lieve th
Greenhouses, their construction and equipment . ter heating 216 GREENHOUSES the boiler is fitted with an altitude gauge,which shows the height of the water in thesystem; also with a thermometer to show thetemperature of the water. A valve is pro-vided for draining the boiler and, if desired,an automatic damper regulating device maybe installed. When used for steamheating the boiler is onlypartially filled with water,and a water column andguage is necessary to indi-cate the height of thewater. A steam guage isalso necessary to indicatethe pressure; and a safetyvalve to automatically re-lieve the pressure, if it be-comes too great for boilers are usually Fig. 114.—Water col- .... , : umn and guage for equipped With automaticsteam boilers hamper regulators. Theyare rather more efiicient than the regulatorsused on hot-water boilers. A drainage valveis provided the same as for hot-water boil-ers. Many states require that all steam boil-ers be equipped with a fusible plug, which issimply a brass plug with a tin core, which. BOILERS, FUELS AND FLUES 2V
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