. Carnegie Institution of Washington publication. a V 34 C! t. tubulure not above 20 fringes in contrast with a normal deflection of 40. Thus a reservoir, within and immediately preceding the pin-hole, removes its valve effectiveness in promoting pressure and virtually opens the reservoir to the air. On the other hand, the prolongation of the quill-tube t", if the diameter is not increased, is almost indefinitely permissible. Thus, by inserting 40 cm., 80 120 cm. length of eighth-inch rubber hose between t" and the pin-hole c, no marked difference in efficiency of the valve-like
. Carnegie Institution of Washington publication. a V 34 C! t. tubulure not above 20 fringes in contrast with a normal deflection of 40. Thus a reservoir, within and immediately preceding the pin-hole, removes its valve effectiveness in promoting pressure and virtually opens the reservoir to the air. On the other hand, the prolongation of the quill-tube t", if the diameter is not increased, is almost indefinitely permissible. Thus, by inserting 40 cm., 80 120 cm. length of eighth-inch rubber hose between t" and the pin-hole c, no marked difference in efficiency of the valve-like action could be detected. In all experiments with closed regions, care must be taken to allow for the temperature or air-thermometer effect resulting from the entrance of light into the resonator. It is small, but gradually increases in the lapse of time. Such results are also obtained when screw-cocks are put in the branches b or b' and very slightly opened. The experiments made suggest a method of obtaining an effect which is at least apparently differential. For this purpose the cock C, figure 33, is to be closed, so that c is inactive, and the pin-hole c', figure 14, to be inserted either into the branch bf, figure 33, or b. With a normal fringe displacement of 40, the pin-hole in b' gave a displacement of 38 fringes, in b correspondingly 27. 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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