. Carnegie Institution of Washington publication. ACOUSTICS AND GRAVITATION. Ill always in a consistent phase-difference relative to the alternating gravitational force. In other words, the discrepant force develops in an orderly manner after the weight M is turned. Furthermore, there is in most of the graphs a marked tendency toward uniform motion of the needle between the turning- points or their equivalents. We may thus explain the ratio of total excursions i: 4:9, for one, two, and three minute periods, more consistently with the obser- vations as follows: In the first minute after turning

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. Carnegie Institution of Washington publication. ACOUSTICS AND GRAVITATION. Ill always in a consistent phase-difference relative to the alternating gravitational force. In other words, the discrepant force develops in an orderly manner after the weight M is turned. Furthermore, there is in most of the graphs a marked tendency toward uniform motion of the needle between the turning- points or their equivalents. We may thus explain the ratio of total excursions i: 4:9, for one, two, and three minute periods, more consistently with the obser- vations as follows: In the first minute after turning
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Image ID: RFRGYD
. Carnegie Institution of Washington publication. ACOUSTICS AND GRAVITATION. Ill always in a consistent phase-difference relative to the alternating gravitational force. In other words, the discrepant force develops in an orderly manner after the weight M is turned. Furthermore, there is in most of the graphs a marked tendency toward uniform motion of the needle between the turning- points or their equivalents. We may thus explain the ratio of total excursions i: 4:9, for one, two, and three minute periods, more consistently with the obser- vations as follows: In the first minute after turning there is a mere accommo- dation of force conditions. Hence the one-minute periods nearly always fail to show interpretable results. In the two-minute and three-minute periods the excursion times have thus been only 2-1 minutes and 3-1 minutes, the latter twice the former. The approximate ratios 4: 9 are thus more probably to be taken for i: 2 or the mere total excursions to be expected from uniform motion. Furthermore, if there is uniform motion, the gravitational attraction is counterbalanced by frictional resistance and the latter may be taken as pro- portional to the speed of the needle. These rates of motion must therefore be looked upon as of much greater interest than the value of the triplets as com- puted above. Moreover, it there is marked drift the value of the triplets will be correspondingly changed, for the force in action is large as compared with gravitation. 88. New apparatus.—Another needle, of the same kind as above, was now installed in a smaller case, capable of exhaustion and useful for other experi- mental work. This consisted (fig. 138 elevation, fig. 139 plan) of a hollow rectangle ww of waxed wood, 1.8 cm. thick, to which glass plates gg' were attached, soft sealing-wax having been melted around their edges, reinforced by steel clips. The needle with the two shots at m, m', 0.56 gram each, and a light mir- ror at n, was supported by the quartz fiber

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