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162 SCIOPTICON MANUAL. firmness by the feet tt, fitting closely into the side grooves when nearing its proper position, and resting flush with the entrance when about in place, leaving about half an inch of the wooden base projecting behind. Oxygen gas in a bag between pressure boards weighted by from fifty to one hundred and fifty pounds, or else com- pressed in a condensing cylinder, is put in connection with the oxygen jet at the stop-cock 0, known by its lever- shaped key. The oxygen should be habitually the last to be let on, and the first to be shut off. The mouth of the jet should be kept clear by the broach v, and the tubing should be kept free from kinks. The oxygen arrangement is the same for each of the three burners. For the alcohol-burner the wick tube, No. 1, Fig. 37, loosely filled with wicking reaching to the height of the jet, is put in connection, by a piece of rubber tubing, with the adjustable fountain at the side of the lantern. When the fountain is full the wick tube is about two-thirds full. The alcohol is kept to this level by screwing the base with one hand, while the fountain is kept from turning by the other; taking care not to lift it so as to overrun the wick tube. The lime-holder may be supported as in the Oil-light Sciopticon, Fig. 42, but a special holder for No. 1 burner is now preferred, with a half cylindrical stem, which, instead of setting into the socket k, fits over the wick-tube and about the wick, to vaporize the alcohol more freely by its heat. For the gas-burner the conical tube g, Fig. 40, is substi- tuted for the wick tube, and connection is made with the house gas fixtures by sufficient length of flexible tubing. This arrangement is to be preferred where house gas is at hand; it is safe, easily controlled, and scarcely inferior to the mixed jet in efficiency. For the mixed jet, connection is made with hydrogen, in