. Bulletin . and a slidingcontact on it to the circuit, to per-mit close adjustment of the tem-perature of the platinum coil. Arough adjustment is made in stepson the transformer. The Avirementioned above requires about 6volts. Use mercury for the con-fining fluid in the slow-combus-tion pipette. Before the pipette is assembledfill the glass tubes in the combus-tion pipette t with mercury to FiGDEB 14.—Details of copper oxide tube complete the electrical circuit. After the pipette ts mounted in place, pass mercury into the bulb m until the pipette is filled to the mark 6>. COPPEH OXIDE TUBE
. Bulletin . and a slidingcontact on it to the circuit, to per-mit close adjustment of the tem-perature of the platinum coil. Arough adjustment is made in stepson the transformer. The Avirementioned above requires about 6volts. Use mercury for the con-fining fluid in the slow-combus-tion pipette. Before the pipette is assembledfill the glass tubes in the combus-tion pipette t with mercury to FiGDEB 14.—Details of copper oxide tube complete the electrical circuit. After the pipette ts mounted in place, pass mercury into the bulb m until the pipette is filled to the mark 6>. COPPEH OXIDE TUBE AND MANIFOLD Figure 14 gives details of the copper oxide tube. Bend thin-walled glass tubing, preferably pyrex, 4 mm. inside diameter, intothe form of a U. Cut it off to comply with the dimensions given inthe figure, and fill it with about grams of fine wire copper oxidecontaining a few particles of metallic copper. The oxide is held inplace by small plugs of glass wool at both ends of the tube. Seal. ANALYSIS OF MINE ATMOSPHEEES 47 capillary tubing of mm. internal diameter to the ends of the thin-walled U tube for connection to the manifold at the stopcocks j and k.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectminesandmineralresou
