. Carnegie Institution of Washington publication. 42 EXPERIMENTS WITH THE DISPLACEMENT INTERFEROMETER. It is also advisable to adjust the plate-glass grating in both cases for compar- ison. In figs. 23, 24, 25, 26 an example is given of these observations in the usual way. Data between January 15 and 24 (fig. 23, A) and March 3 and 6 (preceding fig. 23, B] exhibit the behavior of an oil damper with the ruled grating. In the observations after March 14, running as far as July 14, 1914, the ruled grating was replaced by the film grating. Inasmuch as no essential change was made at the steel hori
. Carnegie Institution of Washington publication. 42 EXPERIMENTS WITH THE DISPLACEMENT INTERFEROMETER. It is also advisable to adjust the plate-glass grating in both cases for compar- ison. In figs. 23, 24, 25, 26 an example is given of these observations in the usual way. Data between January 15 and 24 (fig. 23, A) and March 3 and 6 (preceding fig. 23, B] exhibit the behavior of an oil damper with the ruled grating. In the observations after March 14, running as far as July 14, 1914, the ruled grating was replaced by the film grating. Inasmuch as no essential change was made at the steel horizontal pendulum, the constants may be taken to be the same as above, viz, M = i ,2 50 grams; h = 80 cm.; R = 111 cm.; 7= sec.; 1 = 85 cm.; v> = °. Thus a= AN rad. = ioA]V", FIG. 23. 24. Inferences.—The curves in fig. 23, A, B, are independent so far as zero of measurement is concerned, but they already exhibit a tendency to decline in the direction of a decrease of a. This was pronounced in January and also in March. It is not a regular decrease, so that the cause can hardly be, or at least not wholly be, sought in the yield of the parts of the apparatus; for in such a case there would be no recovery (increase of a), a feature which is often marked. The continuous observations (, with the same uninterrupted zero) are given in figs. 24, 25, 26. The same scale is used throughout, but on April 22 and May 15 it was necessary to displace the graph in order to accommo- date the observations on the sheet. The amount of displacement is shown. Here also there is a gradual and continuous decrease of the values of a. Begin- ning on April i with a. about 2", the observations pass through a succession of oscillations to the lowest value of a recorded, about —;, on May 18. After this there is intermittent partial recovery, so that on June 28 a has. Please note that these images are extracted from scanned page images that m
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