. Carnegie Institution of Washington publication. 52 VAPOR NUCLEI AND IONS. pound (iron stopcock) and the inflow of the external air absolutely avoided. The cock, moreover, is in this way virtually floated in oil; though no such provision is possible to avoid leakage from F to V tlirough C as already stated. The goniometer for the measurement of the angular diameter of the coronas is shown somewhat indistinctly at D. The small vertical plate which serves as the eye rest is 40 cm. from the axis of the fog chamber, to which it is rigidly attached, but with freedom of rotation about a vertical an
. Carnegie Institution of Washington publication. 52 VAPOR NUCLEI AND IONS. pound (iron stopcock) and the inflow of the external air absolutely avoided. The cock, moreover, is in this way virtually floated in oil; though no such provision is possible to avoid leakage from F to V tlirough C as already stated. The goniometer for the measurement of the angular diameter of the coronas is shown somewhat indistinctly at D. The small vertical plate which serves as the eye rest is 40 cm. from the axis of the fog chamber, to which it is rigidly attached, but with freedom of rotation about a vertical and horizontal axis and translation along the latter. The arms are 30 cm. long, opened and closed by a tangent screw. The point source of light (not shown, part of a Welsbach mantle) lies 250 cm. behind the fog chamber, in the same horizontal Fig. 26.—Disposition of apparatus in case of fog chamber (F) and vacuum chamber (V) connected by a 4-inch exhaustion pipe, etc. The X-ray bulb, adjustably placed with the induction coil and inter- rupter on a table provided with wheels, could be moved as near to the fog chamber, or remote from it, as desirable, with facility. The fog chamber itself was a cylindrical jar of glass, provided with a metallic face held in place by bolts and tightened by a rubber gasket. Wax-resin cement was used in liberal quantity everywhere, and internal metallic parts were so far as possible covered with a coat of it. In later experiments a cylinder of wet cloth was placed in the tube between C and F, to saturate air, in addition to the rectangular framework within the fog 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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