. Carnegie Institution of Washington publication. REGIONS OF MAXIMUM IONIZATION. 43 from infection such as an emanation would produce, and anything of this kind is at once detected. 35. Long fog chamber.—After obtaining these results, the work was resumed with the aid of a larger fog chamber, F F, fig. 12, conical in shape, no cm. long, 22 cm. in diameter at the broad end, tapering down to 14 cm. at the small end, E, whence the exhaustion took place. It was so mounted as to place the axis slightly inclined above the horizontal, in order that an even depth of water, w, from end to end, might be
. Carnegie Institution of Washington publication. REGIONS OF MAXIMUM IONIZATION. 43 from infection such as an emanation would produce, and anything of this kind is at once detected. 35. Long fog chamber.—After obtaining these results, the work was resumed with the aid of a larger fog chamber, F F, fig. 12, conical in shape, no cm. long, 22 cm. in diameter at the broad end, tapering down to 14 cm. at the small end, E, whence the exhaustion took place. It was so mounted as to place the axis slightly inclined above the horizontal, in order that an even depth of water, w, from end to end, might be stored. In the first experiments the large end was of glass, in the later of metal, but this difference is without appreciable effect upon the present results. In each case a hole H, 2 or 3 cm. in diameter, was available near the center of the large end for the introduction of an axial aluminum tube AR (walls cm. thick), running from end to end of the chamber and closed at R within it. In the inside of this tube the sealed radium tube- lets could be moved from place to place, in a way similar to the method followed in the preceding experiments. No wet-cloth lining was intro- duced, because the experiments had to be performed so slowly that saturation in case of a clean fog chamber, to which water adheres in an even film, was assured. The best method of cleaning is vigorous rubbing with a soft rubber probang, as for instance, a thick piece of rubber tubing at the end of a metal rod. Every part of the glass must be FIG. 12.—Section of long fog chamber with hollow aluminum core. The chamber was too large to admit of the capture of as many ions for like conditions of exhaustion as was the case with the preceding smaller apparatus, but this difficiency is of no importance here. Filtered air is admitted through 7. 36. Data.—Table 15 gives an example of typical results as obtained both with the glass and the metal capped fog chamber, the opposite (exhaustion) end
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