. Carnegie Institution of Washington publication. DESCRIPTION OF APPARATUS AND METHODS. 25 In fig. 5 is shown the manner of mounting the cell-holder, C, in ver- tical guide F, upon the movable spectrometer arm, A. (See also fig. i.) A double-walled sheet-iron and asbestus shutter moves in the vertical guide, W. The heater of a Nernst lamp is at H, while the spectrometer slit is at F. The cell for the gases was of glass tubing, with rock-salt plates for windows. It is shown in fig. 10, while fig. 11 shows the manner in which it is mounted in its holder by means of the key, k. This holder could
. Carnegie Institution of Washington publication. DESCRIPTION OF APPARATUS AND METHODS. 25 In fig. 5 is shown the manner of mounting the cell-holder, C, in ver- tical guide F, upon the movable spectrometer arm, A. (See also fig. i.) A double-walled sheet-iron and asbestus shutter moves in the vertical guide, W. The heater of a Nernst lamp is at H, while the spectrometer slit is at F. The cell for the gases was of glass tubing, with rock-salt plates for windows. It is shown in fig. 10, while fig. 11 shows the manner in which it is mounted in its holder by means of the key, k. This holder could then be placed in the vertical guides shown in fig. 5. The shutter and the cell holder were operated from the observing telescope by means of cords and pulleys, so that it was necessary to enter the room only in making the spectrometer settings. SOURCE OF RADIATION. The question of the source of radiation, with several curves showing the distribution of the energy in several kinds of electrically heated. Fig. 5. clay radiators is given in Appendix I, in which is shown the great adapt- ability of the " heater " of a Nernst lamp for this work, on account of its strong radiation beyond 4 ix, and also on account of the ease with which the constancy of the radiation can be maintained. Although two I lo-volt heaters were provided, only one was generally used. Current was obtained from a storage battery of 90 cells, which brought the " heaters " to a rich cherry red. The " heater " thus used would last for several months. But when used on a battery of 120 cells it lasted but a few weeks, when it was found that the platinum conducting wire, under the clay surface, had vaporized, and the surface of the heater was covered with beautiful microscopic crystals of Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectl
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