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MCINTOSH BATTERY AND OPTICAL CO., CHICAGO, ILL., U. S. A. 79 der from the first generating. As soon as the outside pressure as indicated on the gauge, exceeds that already in the cylinder, open up globe valve F, and allow the gas to enter the cylinder. This second charging should give you ioo pounds pressure to the square inch, this being the amount to which we recommend that this apparatus should be charged. With this amount of pressure, you have in this sized cylinder (12 inches in diameter by 42 inches in height), 18^ cubic feet, nearly enough for four solid hours of work; in fact enough for two complete lectures, although it is advisable to always make gas before each enter- tainment, so that you can guard against any accident by leakage or otherwise. Gas having ceased to come over, close valve F tight; disconnect the apparatus at unions 1, 2 and j, and at F unscrew the cross-piece from the top valve F, and into valve F, then you screw the plug cap with washer so that no leakage can occur, supposing some idle hands carelessly tamper with the globe valve F. When about to use the cylinder with the valve F still closed, unscrew the plug-cap, and screw firmly into its place with a washer underneath, the double needle valve ; then open up the globe-valve F, and the gas goes onto the main spindle of the needle-valve, which you open widely; this lets the gas go onto the small needle or wheel-valve, as it is sometimes called. With this smaller needle-valve you effect the adjustment of the gases. Having adjusted it properly you can leave this small needle-valve adjusted, just as it is, and closing the main spindle the pressure is shut off, and yet the equilibrium of gas necessary for perfect light is established, and is in good shape and order for the entertainment; when you commence your entertainment, all that is necessary is to open up the main spindle of needle-valve. The Safety Blow-Out B is a safeguard against any explosion that could possibly occur. It is provided with a thin metallic disc that will blow out or burst at a pressure of 200 pounds to the square inch. It is well from time to time to examine this blow-out disc and see that the metal is not cor- roded. Should it show evidences of roughness or corrosion, put in a new plate. This is an efficient safeguard, and no dangerous accident can occur. Another safeguard is the Check-Valve C, which, should one carelessly open up the globe-valve F before the outside pressure had exceeded that already left in the cylin- der at the close of the last entertainment, or of the first genera- tion of gas, would prevent the driving of the water back into the