Replaceable porcelain heating elements made of open helical coils of high-resistance wire covered with fluted refractory bobbins, for oil, geyser, chemical and water heating in a thermowell. High precision, metal-sheathed fixtures, a screw-plug option and a stainless steel emitter strip give durable, reliable performance for anodizing and plating baths, phosphoric/chromic acid processing, alkaline solutions, and powder coating booths.
