The Astrophysical journal . e,by adjusting the current, to keep the density of the vapor veryconstant. Availing myself of this experience, I made the followingarrangement for the investigation of dispersion bands. APPARATUS NN (see Fig. i) is a nickel tube of 60 cm length, 5. 5 cm diameter,and cm thickness. Its middle part, having a length of 30 cm,is placed inside an electrical furnace of Heraeus (pattern E 3). Overits extremities covers are placed, the edges of which fit into circularrims soldered to the tube, which consequently shut air-tight when therims are filled with cement. When t
The Astrophysical journal . e,by adjusting the current, to keep the density of the vapor veryconstant. Availing myself of this experience, I made the followingarrangement for the investigation of dispersion bands. APPARATUS NN (see Fig. i) is a nickel tube of 60 cm length, 5. 5 cm diameter,and cm thickness. Its middle part, having a length of 30 cm,is placed inside an electrical furnace of Heraeus (pattern E 3). Overits extremities covers are placed, the edges of which fit into circularrims soldered to the tube, which consequently shut air-tight when therims are filled with cement. When the furnace is in action, a steadycurrent of water, passing through the two mantles M and Mf, keeps 1 Phil. Mag., (6) 3, 128; 6, 362, 1903. DISPERSION BANDS 97 the ends of the tube cool. Each of the two caps has a rectangularplate-glass window, and also, on both sides of this, openings a andb (b and a), placed diametrically opposite to each other and providedwith short brass tubes, the purpose of which will appear Fig. Moreover, in one of the two caps (see also Fig. 2) two other short tubes c and d are fastened in openings; through c the porcelain tube of a Le Chatelier pyrometer is fitted air-tight, while on d a glass cock with mercury lock is cemented, leading to a manometer and a Geryk air-pump. As soon as the sodium (a carefully cleaned piece of about 7 grams) had been pushed to the middle of the tube in a small nickel dish provided with elastic rings, the tube was immediately closed and exhausted. We shall now describe thearrangement by which arbitraryinequalities in the density distribu-tion were produced inside the massof vapor. It consists of two nickeltubes A and B of o. 5 cm diameter,leading from a to a and from b to b, and so bent that in the heatedmiddle part of the wide tube they run parallel over a length of 30 cmat a distance of only cm. In the four openings of the caps, Aand B are fastened air-tight by means of rubber packing. Thiskind of connecti
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectspectru, bookyear1895
