Account of pendulum experiments undertaken in the Harton Colliery, for the purpose of determining the mean density of the earth, by G. B. Airy
series. The most probable cause is some trifling error or unsteadiness in the manner of fixing the agate-plane- -frames upon the iron stands. It is not a change in either of the pendulums after the Second Series, inasmuch as the value of the mean is altered the same way <s>for</s> under the alternation of position of the pendulums. Whatever the cause may have been, the effect is extremely small. There appears to be no reason for altering the concluded rate of Gravity below to Gravity above. The probable error stated in the last paragraph <s>above</s> may be doubled, but I think that there is no sufficient ground for trebling it. The amount of the uncertainty, so increased, is <s>[?]</s> insignificant for the purposes of this experiment. 47. There remains, however, a serious question whether there may have been any <s>[?]</s> difference in the circumstances of the upper and lower pendulums, not included in the correction applied, which <s>[?]</s> can produce an effect similar to that of a change of gravity. The first point to be considered is, the instability of the mountings.
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Account of pendulum experiments undertaken in the Harton Colliery, for the purpose of determining the mean density of the earth, by G. B. Airy, 1855. From The Royal Society, PT/54/5
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