. The art of lead burning; a practical treatise explaining the apparatus and processes. 4 pound THE ART OF LEAD BURNING. 59 pressure for every foot of head. For example:The hight of Hqiiid in the generator measuredfrom the bottom of the acid supply pipe to thetop of the water or acid line, when at its highestlevel, would be 3 feet. Allowing ^ pound forevery foot in hight would give a pressure of i^pounds, which is slightly in excess of the mathe-.

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