Welding; theory, practice, apparatus and tests, electric, thermit and hot-flame processes . re is little oxygen lost when the retort is recharged, because thepressure is low in all of the chambers; that loss from leakage ismuch less; that the bubbles of gas being much more expanded inpassing through the hydroxid solution are washed much morethoroughly. One writer^ estimates the cost of the oxygen mixture, whenmade from fairly pure chemicals, at eight cents a pound. Onepound producing 4 to 4 1/2 feet, brings the cost of the oxygento about cents a cubic foot. This is exclusive of freight an
Welding; theory, practice, apparatus and tests, electric, thermit and hot-flame processes . re is little oxygen lost when the retort is recharged, because thepressure is low in all of the chambers; that loss from leakage ismuch less; that the bubbles of gas being much more expanded inpassing through the hydroxid solution are washed much morethoroughly. One writer^ estimates the cost of the oxygen mixture, whenmade from fairly pure chemicals, at eight cents a pound. Onepound producing 4 to 4 1/2 feet, brings the cost of the oxygento about cents a cubic foot. This is exclusive of freight andoperating charges. Oxone.—Very pure oxygen can be generated on a small scaleby wetting sodium peroxid. 4NaO+2H20 = 4NaOH+0,. The Oxone idea is a recent development of an old sodium peroxid in fused lumps is delivered in hermeticallysealed cans to protect it from the moisture. Each pound ofOxone produces over 2 feet of the gas, at a price of from 13 to20 cents a foot.^ The generator (Fig. 41) is made by the Nel- * American Machinist, Henry Cave.^Special Information. WELDING. THE OXY-ACE XYLENE PROCESS 89 son Goodyear Company and sold by the Roessler & HasslacherChemical Company, To make oxygen several holes are punched in the top andbottom of the can and it is placed in the generator. The gen-erator is filled with water to the mark, closed and the needle
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