. Carnegie Institution of Washington publication. 122 DISPLACEMENT INTERFEROMETRY APPLIED TO Ay = Water which had stood in the same room for days, alongside of the apparatus, was now poured in and observations of y made in half- hour periods throughout the afternoon, August 18. The readings as given in figure 156 b indicate a drifting needle, modified according as the drift to larger numbers was with the gravitational pull (5) or against it (N). This force is wholly secondary and almost masked. Its mean effectiveness is but Ay = cm. The same experiment (half-hour periods) was continu
. Carnegie Institution of Washington publication. 122 DISPLACEMENT INTERFEROMETRY APPLIED TO Ay = Water which had stood in the same room for days, alongside of the apparatus, was now poured in and observations of y made in half- hour periods throughout the afternoon, August 18. The readings as given in figure 156 b indicate a drifting needle, modified according as the drift to larger numbers was with the gravitational pull (5) or against it (N). This force is wholly secondary and almost masked. Its mean effectiveness is but Ay = cm. The same experiment (half-hour periods) was continued throughout the whole of the ensuing day, August 19, the greatest attention being paid to carefully sitrring the water. The results are given in figure is6cand show only slight improvement. There is still an excess of drift, but alternations of gravitational pull are now usually apparent. The mean excursion is but Ay = in the morning and Ay= in the afternoon. The change of. temperature of the water-bath could not have exceeded a few tenths degree; but to give greater definiteness to this statement, the experiments were con- tinued in the same way during a third day, August 20, and parallel observa- tions made on the temperature of the water-bath by a tenth-degree thermom- eter. The results also given in figure 156 d are quite as erratic as the pre- ceding. In the morning the gravitational and radiant (repulsive) forces are all but equal. In the afternoon, with a different adjustment, the effect of grav- itation gradually emerges, frequently only as an acceleration or an impedi- ment on the drift. In fact, the needle is in continual motion and the results would have been more rational if the periods instead of being 30 minutes, had been shorter. As it is, the mean (p. m.) gravitational excess is but Ay= cm. The gradual increase of the temperature of the water-bath scarcely amounted to one-fifth of a degree for the day. Now the actual temperature. Please note that
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