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Show Emptying Oil Barrels by Compressed Air A LETTER in a recent Issue of Power describes de-scribes a device for emptying barrels of jj oil by the compressed-air process. The writer 1 states that with 4 lb. pressure a barrel of engine Oil could be emptied In seven minutes, forcing thn oil to an elevation of eight feet I A dead-weight eafeiy valve to avoid execs j pressure was made by turning the threads off the stem of a 3-4-in. anle-valve and securing sufficient weight to the vat. c wheel to balance a t-lb pressure. This valve was placed !n the air line between the barrel and the air-supply ' valve, which, for ease of control, should nut be larger than J-i In. If for any reason the oil did I not flow readily from the barrel, the safety vahe jit evented the pressure building up. The small iH opening of a 1-1-in. valve was sufficient to tie-atc tie-atc the oil rapidly. In elevating cylinder oil In cold weather, the barrel was moved to a warm place for two or iH three days before unloading to get the oil more i limpid It usually required from 30 to 40 m:n-utes m:n-utes to empty a barrel of average cylinder oil. The ordinary oil barrel will safely withstand iH 4 lb. pressure, and after a little experimenting iH with the amount of opening necessary to girt the air-supp.'y valve, one can connect up the ap-paratus. ap-paratus. turn on the air and go abont other iH work without and danger of a burst barrel. tH When the oil Is all out of the barrel, the slight flow of air ,vrough the discharge pipe will Indicate Indi-cate It and no damage will be done if no one ii near to shut off the air iH |