Note the bolted joint to allow the boiler shell to be dismantled for cleaning. The green box encloses the electric fan for an oil spray burner. The two vertical cylinders are Mobrey automatic water-level valves controlling the feedwater level.
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== {{int:filedesc}} == {{Information |Description=Clarkson thimble tube boiler at Clearwell Caves. Note the bolted joint to allow the boiler shell to be dismantled for cleaning. The green box encloses the electric...