Account of pendulum experiments undertaken in the Harton Colliery, for the purpose of determining the mean density of the earth, by G. B. Airy

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                                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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Manuscript details

Author
George Biddell Airy
Reference
PT/54/5
Series
PT
Date
1855
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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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