. Carnegie Institution of Washington publication. 110 DISPLACEMENT INTERFEROMETRY APPLIED TO room, of practically constant temperature. In any given series, for instance, the behavior is consistent. The repulsive force retains its relations relative to the gravitational attraction, changes sign with it in a consistently different phase, in each of the series of results. If there were any approach to reso- nance between the period of the alternating force and the needle, an explana- tion of the results might be attempted; but the semi-period of the needle may be estimated at 10 or 20 minutes. I
. Carnegie Institution of Washington publication. 110 DISPLACEMENT INTERFEROMETRY APPLIED TO room, of practically constant temperature. In any given series, for instance, the behavior is consistent. The repulsive force retains its relations relative to the gravitational attraction, changes sign with it in a consistently different phase, in each of the series of results. If there were any approach to reso- nance between the period of the alternating force and the needle, an explana- tion of the results might be attempted; but the semi-period of the needle may be estimated at 10 or 20 minutes. It is aperiodic, practically creeping. 87. Further observations.—The needle was now dismounted and the obser- vations of § 84 on the elastic coefficient of the needle were concluded. After it had been put together again with improvements, and readjusted, the observations of figures 133, 134, 135, one and two minute periods, were then taken. The observer throughout kept at a distance from the apparatus except at the time of reading the telescope. It will be seen that the observations for one-minute periods again fail in the usual way. For the three-minute periods the results are normal, as the needle swings with apparent inertia after turning. o™ itr ar U i I** y/l«" 9/T*- 1(T SO". 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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