. Carnegie Institution of Washington publication. 44 VAPOR NUCLEI AND IONS. 41. The same, continued. X=ray bulb inclosed in lead.—In the experi- ments detailed the X-ray bulb was not inclosed, so that secondary radiation issued from the whole surrounding environment. In the data given in table 17 the bulb is surrounded by a wide lead box, containing a window cm. in diameter fronting the fog chamber. The window was in a removable side or lid of the box. This was kept at a long distance (D = 6oo cm.) in order to furnish weaker ionization than was specified in table 20 25 30 35 40 Fig. 2
. Carnegie Institution of Washington publication. 44 VAPOR NUCLEI AND IONS. 41. The same, continued. X=ray bulb inclosed in lead.—In the experi- ments detailed the X-ray bulb was not inclosed, so that secondary radiation issued from the whole surrounding environment. In the data given in table 17 the bulb is surrounded by a wide lead box, containing a window cm. in diameter fronting the fog chamber. The window was in a removable side or lid of the box. This was kept at a long distance (D = 6oo cm.) in order to furnish weaker ionization than was specified in table 20 25 30 35 40 Fig. 24.—Efficient nucleations in dust-free air, energized or not by radium or the X-rays from different distances (D) and different exhaustions (dp). X-ray bulb not within lead case, unless stated. In the first part of table 16 the exhaustion, dp = 27 cm., lies below the fog limit of dust-free air. The low degree of ionization is thus shown under different conditions. The second series contains a number of successive exhaustions for an increasing dp, with the radiation passing through a thin tin plate. Parts III and IV of the table are similar. 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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