. Carnegie Institution of Washington publication. 8 DISPLACEMENT INTERFEROMETRY APPLIED TO The second modification (fig. 7) of the electrophorus was then used with the plates quite separated and the micrometer-screw above. The insulation was much better, the loss amounting to not more than 2 fringes in 10 minutes at full charge. The pitch of the micrometer-screw being now cm., the upper plate was conveniently discharged when d' = i cm. above the hard-rubber ID. SO surface. Large fringes (about scale-parts) were installed. The results (fringe-readings «in terms of displacement y) obtain
. Carnegie Institution of Washington publication. 8 DISPLACEMENT INTERFEROMETRY APPLIED TO The second modification (fig. 7) of the electrophorus was then used with the plates quite separated and the micrometer-screw above. The insulation was much better, the loss amounting to not more than 2 fringes in 10 minutes at full charge. The pitch of the micrometer-screw being now cm., the upper plate was conveniently discharged when d' = i cm. above the hard-rubber ID. SO surface. Large fringes (about scale-parts) were installed. The results (fringe-readings «in terms of displacement y) obtained in the same way as the preceding are shown in figure 9. The outgoing and incoming series practically coincide. Figure 10 shows a series of results in which the plates were discharged at different distances d' = , , , (clear distance between rubber and metal faces) apart. If we write y* = Cx, x= i.$n (x in scale-parts, about two- thirds fringe), the relations are = io3C= 90 124 cm. 200 These parabolas are only approximate ; in each case except the last, C decreases appreciably as x increases. The frinpe displacement is in excess of the equa- tion yz = Cx, owing, as I take it, chiefly to the escape of negative charge to the electrometer as d' decreases. The relation of C and d1 (fig. n) is again apparently parabolic in shape, but remotely so; for if we write Gi = cd> ', the values of c (fig. n) rapidly decrease as d increases, probably for the reason just 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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