. Carnegie Institution of Washington publication. VAPOR NUCLEI AND IONS. (Welsbach mantle) was 250 cm. beyond the fog chamber. Usually the angular diameter of the coronas is about 5/30. In table i, 5t refers to the goniometer nearer the radium, s2 to the other, and Nt and N2 are the corresponding nucleations, when D is the distance of the radium tube from the end of the cylinder. After the influx of filtered air, time was always allowed for the dissi- pation of convection currents. There was some difficulty in reading both goniometers consecutively without loss of time, as the small coronas so
. Carnegie Institution of Washington publication. VAPOR NUCLEI AND IONS. (Welsbach mantle) was 250 cm. beyond the fog chamber. Usually the angular diameter of the coronas is about 5/30. In table i, 5t refers to the goniometer nearer the radium, s2 to the other, and Nt and N2 are the corresponding nucleations, when D is the distance of the radium tube from the end of the cylinder. After the influx of filtered air, time was always allowed for the dissi- pation of convection currents. There was some difficulty in reading both goniometers consecutively without loss of time, as the small coronas soon vanish with the subsidence of the fog particles. It was necessary to cleanse the walls carefully before beginning the work to obviate deposits of D R Fig. i. c +— FIG. 2 £>-Effe of radi im 1 —+—1 to •2 -30 -20 -10 Fig. 2. 20 30 «0 "ft' i4- fr p )e *h- Jt # Fig. 3. Fig. 4- Figs, i, 3, 4.—Types of cylindrical fog chamber. Axial section. E, exhaust pipe; c, cloth partitions. Fig. 2.—Nucleation (A/) due to weak radium at different distances from and on top (side of cylinder) of the fog chamber. Table 1. The table gives evidence of a small difference between Nl and iV2, but this is here unquestionably an observational error, particularly as its sign is often reversed. The chart (fig. 2) then shows the mean number of nuclei within, when the radium is at D = o, 20, and 40 cm. from the end; and while the nucleation drops off rapidly from 100 to 45 and 24. 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 perfectly resemble the original Carnegie Institution of Washington. Washington, Carnegie Institution of Washington
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