. Carnegie Institution of Washington publication. 104 DISPLACEMENT INTERFEROMETRY APPLIED TO for a half hour or more. The observations usually began at about 10 a. m. and were finished after ; it is thus convenient to distinguish and excursions, as will be done presently. The date of each gioup is marked on the graph. The first feature of the results is the gradual drift into larger figures, but this may be incidental. For the present it is of no interest, as it would have to be interpreted in the future and does not affect the triplets. The next feature is the enormous variabil
. Carnegie Institution of Washington publication. 104 DISPLACEMENT INTERFEROMETRY APPLIED TO for a half hour or more. The observations usually began at about 10 a. m. and were finished after ; it is thus convenient to distinguish and excursions, as will be done presently. The date of each gioup is marked on the graph. The first feature of the results is the gradual drift into larger figures, but this may be incidental. For the present it is of no interest, as it would have to be interpreted in the future and does not affect the triplets. The next feature is the enormous variability of the excursions. These are given for a. m. and p. m. times in figure 121, at first including the mean values. The needle of the apparatus pointed north-south; consequently the weights M took position east-west of the shot. On the west side was the large central pier in the middle of the laboratory to which the case of the apparatus was attached. On the west side, at a distance of meters, was the heavy base- ment wall of the laboratory, feet thick, and this was illuminated on the outside in the morning only, by the sun if shming. When M is on the east, the. deflections recorded are toward large numbers. One notes the generally greater variability of the top readings as compared with those at the bottom (M west). This is particularly marked during the hot weather near the end of July. A second apparatus (No. II, below) was afterward placed on the east-west wall of the pier, the needle pointing in that direction, and the variability, though still very marked, was less excessive. It is thus clear that in figures 119, 120, we are confronting a pervasive temperature or radiation effect. To ascertain the extent of this, figure 121 may be consulted, as it exhibits the mean excursions Aj, a. m., , and their means for the successive dates. On the cooler days there is little difference in the a. m. and p. m. readings, and these were therefore at first. Please note that t
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