Canadian foundryman (1917) . pair of fur-naces can be utilised in conveying thenecessary pipe-lines for the air and oilsupply close up to the opening of theburner brick. Valves are, of course, re- inside the furnace, great economy in theheating power results, and uniform timeof melting may be relied upon. The form of oil-burner depends uponwhat type of air-pressure plant is in-stalled in the works. Where compres-sed air is already in use it must be re-duced in the foundry to not more than25 lb. per square inch effective pressureat the burner valve. The burner mustthen be of the special high-pr
Canadian foundryman (1917) . pair of fur-naces can be utilised in conveying thenecessary pipe-lines for the air and oilsupply close up to the opening of theburner brick. Valves are, of course, re- inside the furnace, great economy in theheating power results, and uniform timeof melting may be relied upon. The form of oil-burner depends uponwhat type of air-pressure plant is in-stalled in the works. Where compres-sed air is already in use it must be re-duced in the foundry to not more than25 lb. per square inch effective pressureat the burner valve. The burner mustthen be of the special high-pressure de-sign, which is found to be exceedinglyeffective in producing the necessary pul-verising action on the heaviest types ofcrude oil employment, and in this wayhigh economy in melting may be secur-ed. Such low figures as gals, con-sumption for each hundred pounds ofbrass melted can be consistently main-tained. The slightly increased cuttingaction of the hie:h-pressure burnerflame, both on the furnace lining, where. ELEVATIONS AND PLAN OF SIMPLE CRUDE OIL FURNACE. quired to regulate the inlet of each, sothat the correct pulverising of the oilinto a suitable spray is effected to givethe right flame to envelop completelythe crucible and have a small flame pro-truding from the cover opening. The shape of the special burner brickallows the oil spray to spread out in aconical fashion, and, igniting on enter-ing the furnace with a tangential mo-tion, it causes the flame to sweep roundin the annular space between the fur-nace walls and the crucible before pass-ing out at the central opening in thefirebrick cover. By using a single burn-er brick of the required shape, and alsoby having the firebrick slab for the floorof the furnace in one piece, there is nochance of leakage or escape of uncon-sumed oil, and as it is thus all burned carbonisation is likely to result, and onthe crucibles themselves, makes this ex-treme saving of oil a questionable ad-vantage in view of the short
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