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78 MCINTOSH BATTERY AND OPTICAL CO ., CHICAGO, ILL., U. S. A. directions for the manufacture of oxygen with this appa- ratus. Supposing the apparatus to be already connected up, as de- picted in cut; disconnect Unions Nos. 2 and i; fill the wash bot- tle D half full of water, into which has been placed a couple of teaspoonfuls of bicarbonate of soda; this is to neutralize the acidulation obtained in the generation of oxygen. Place in re- tort A two packages, or, in quantity, three pounds of potassium chlorate, and one pound black binoxide of manganese, pouring same through a large tin funnel, into the pipe at Union 1. Fasten down Unions Nos. 1 and 2 again tightly; no undue exertion is needed; only have them fit firmly and closely onto the washers so that no leakage is possible. Allow Union No. 3 to be slightly open; apply heat to A-, this you can do by means of an ordinary cook stove, an ordinary heating stove, where it is possible to get the retort into the stove onto the fire, or it can be made over an ordinary gasoline stove, or, in fact, in the open air, by build- ing a fire under it. An ordinary soap or cracker box smashed to pieces will afford heat enough for the generation of oxygen. Having applied heat for two or three minutes, until you can hear a bubbling in the wash bottle, which, at the beginning, in- dicates that the hot air is passing over and out, escaping at Union 3; having waited for not more than two or three minutes, close Union 3 tightly; open the valves E, F, G, which allows the gas to not only enter the cylinder, but at the same time it presses on the gauge;you do not need great heat; oxygen isof a betterqual- lty when made slowly than rapidly. It is not necessary to get the retort to a red heat, although a dull red is not objectionable. From these two packages, or from the exact quantity above given, 65 pounds pressure should be indicated on the gauge. When the gas has ceased making, which is indicated by the cessation of the bubbling in the wash bottle, and also by the indicating needle of the gauge remaining stationary, then close globe valve F tightly, disconnect Union No. 1, and, while the retort is still warm, wash it out thoroughly with water until it is perfectly clean, dry it thoroughly, place in it one package of 24 oz. of po- tassium chlorate, and 8 oz. of black binoxide of manganese. Fasten tightly Union No. 1, again loosening slightly union No. 3. Apply heat; allow the hot air to escape as before. Close Union j tightly and open up globe valves E and G (not F), and allow the gas to pass through against the gauge until the pressure on the gauge exceeds that already in the cylin-