. Bulletin . its use. The instrument is made in two different models. The laboratorytype (PI. VII and fig. 25) is of rigid construction, has gas cham-bers 1 meter long, and is employed for exact gas analysis. It cor-responds to apparatus that use mercury as the confining fluid, andwith which results accurate to to per cent can be experience is required before one becomes sure of the read-ings. The laboratory type only is discussed here. Mohr, 0., Die Verwandung des zeisschen Interferometers zur technischen Rauch-gasanalyse: Ztschr. angew. Chem., Jahi-g. 25, June 28, 191
. Bulletin . its use. The instrument is made in two different models. The laboratorytype (PI. VII and fig. 25) is of rigid construction, has gas cham-bers 1 meter long, and is employed for exact gas analysis. It cor-responds to apparatus that use mercury as the confining fluid, andwith which results accurate to to per cent can be experience is required before one becomes sure of the read-ings. The laboratory type only is discussed here. Mohr, 0., Die Verwandung des zeisschen Interferometers zur technischen Rauch-gasanalyse: Ztschr. angew. Chem., Jahi-g. 25, June 28, 1912, pp. 1313, 1317. ** Haber, F., Optische Analyse der Industriegase: Ztschr. angew. Chem., Jahrg 19,Aug. 17, 1906, p. 1418-1422. * Lowe, F., Ein neues Interferometer fiir Gase und Flussigkeiten : Physikal. Ztschr.,Jahrg. 11, No. 23, 1910, pp. 1047-1051. «Kiippers, E., Die. Bestiinmung des Methangehaltes der Wetterprobeu nut Hilfe destragbaren Interferometers: Oliickauf, Jahrg. 40, .Tan. 11, 1913, pp. BUREAU OF MINES BULLETIN 197 PLATE VIII
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