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MCINTOSH BATTERY AND OPTICAL CO., CHICAGO, ILL., U. S. A. seconds, or until no ether will flow out at V, V, when the Saturator is held horizontally, as in cut, then replace metal caps until ready to connect with the lantern. 8^°-Never fill near a light. Keep at least ten feet away from any flame when filling the Saturator, and never allow any chamber con- taining ether to become heated. Remember that ether vapor (unlike hydrogen and coal gas) is heavier than air, and diffuses rapidly down- ward ; also, that it vaporizes much more readily in a warm than in a cold room. The ether is held in place in the cloth filling by capil- lary attraction, which does not act perfectly for a height of more than two inches; for that reason, the filled Saturator should always lie on a nearly level surface, to prevent the ether from draining into one end. It works better to be placed on a level with the Lantern (see cut). Do not connect with the jet and oxygen supply until ready to start the light. To Connect with the Lantern. —Remove the metal caps from V, V, and connect one tube of the Saturator with the By key of the lantern, and the other with the T tube, as shown in cut. It is im- portant that the ether vapor be carried through the hydrogen key of lantern. See that all keys are closed before connections are made, and be careful that there is no leakage of gas when connections are complete. Caution, i. —Do not raise the Saturator while making connec- tions, lest free ether run into the tube Oi. Carelessness in this respect may lead to destruction of the gas bag. It is a useful precau- tion to bend up the tube O above the level of the Saturator at one point, so that no free ether can run back into the gas-bag. 2.—Never connect the Saturator with the Lantern by the same tubing that is used in making gas. Particles of chemicals carried into it during this process are liable to be blown into the jet, and stop the flow of gas, which extinguishes the light. The Lime should be kept perfectly dry; do not place it in the holder until ready to light up. It should turn as close to the jet as possible without touching it. If cracked or rough from the action of air or moisture, it interferes with the perfect working of the light, produces hissing, and is liable to break, necessitating a stoppage of the light to replace it. Since the intense heat destroys the lime by degrees, it is necessary to occasionally turn, raise or lower it slightly to expose a fresh surface to the flame, otherwise the light will grow dim. The Oxygen Reservoir. —If a gas-bag is used to hold the oxygen, it should be laid between two pressure-boards of suitable size to pro- tect it from cracks or splinters in the floor below, and cutting edges of the weights above. Anything that is convenient may be used for weights : kegs of nails, stones, etc. Coarse bags filled with sand make convenient weights. They should be adjusted so that they cannot "oil off. From 150 to 225 pounds are best for a single lantern, and from 200 to 300 pounds for dissolving. The greater the pressure up to a certain point, the more brilliant the light; the gas is used more rapidly than necessary for most kinds of work, with the larger weight named. The nearer the upper edge of the pressure-board the weights