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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                                - observations: <s>[?]</s> chiefly, perhaps, in
the insecurity of the indications of the  temperature of the
pendulum as inferred from the readings of the
neighbouring thermometers. After consideration of these
points, I have thought it best to give equal weights to
the results. And for comparison with the simple mean of these, I have
taken the simple mean of the thermometer-readings.
Thus I obtain,

[Table for Fifth, Sixth, Seventh and Eighth Series not transcribed]

The interpretation of these numbers is not without difficulty.
From the care taken by the observers, it was supposed
that the material state of the pendulums would be
sensibly the same during the whole continuance of the
observations, and it was expected therefore that the
results of the Fifth and the Seventh Series would be
in close accordance, and that the results of the Sixth
                            
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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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