Catalog of stereopticons, motion picture machines, projection apparatus : manufactured and imported by the McIntosh Stereopticon Company . Monitor with Alco-lite illuminant. CARBONS. After years of experiment, we have found that the im-ported Electra Nuernberg carbons are the most satisfactoryfor use in a projection lantern. They are freer from impuri-ties, and of a finer quality of carbon, so that they burn withless sputtering and fuss. On direct current the positive pole may easily be deter-mined by striking the arc and allowing the lamp to burn forabout a minute; then switching ofT the curr
Catalog of stereopticons, motion picture machines, projection apparatus : manufactured and imported by the McIntosh Stereopticon Company . Monitor with Alco-lite illuminant. CARBONS. After years of experiment, we have found that the im-ported Electra Nuernberg carbons are the most satisfactoryfor use in a projection lantern. They are freer from impuri-ties, and of a finer quality of carbon, so that they burn withless sputtering and fuss. On direct current the positive pole may easily be deter-mined by striking the arc and allowing the lamp to burn forabout a minute; then switching ofT the current and quicklyglancing at the hot ends of the carbons. The hotter of the twois the positive carbon and should be the upper carbon. PRICES:—^-inch soft cored carbons, each, net 4c ifii-inch soft cored carbons, each, net 4c ^-inch solid carbons, each, net 4c j4-inch soft cored carbons, each, net 4c ^-inch soft cored carbons, each, net 4c 18 Mcintosh stereopticon co., Chicago, ill., u. s. a. THE McINTOSH PRICE, with choice of either 6, 8, 10 or 12-inch focus objectivein % mount, slide carrier and carrying case, without illuminant. $ with heavy protected body, choice of objectives above and90° Hand-Feed Arc Lamp, but without rheostat or case,desip jed to pass Chicago electrical requirements Illuminants. PRICE, Arc Lamp, either Upright or 90o and No. 1 Rheostat Oxy-hydrogen Jet, No. 3 Alco-lite, complete Nernst Lamp * Quadruple Acetylene Jet, and support, witkout generator Incandescent Electric Lamp, with flexilile wire, 250 Incandescent Electric Lamp, with flexii)le wire, 500 Any of the seven different illuminants listed above can be used inter-changeably in this lantern. A large body completely surrounding theilluminant has the advantage of preventing almost entirely the escape oflight, and when used with the electric arc lamp permits of the use of aheavy current without overheating. The condensing lenses a
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