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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                                     Section XIII. Computation of Log Rate of Pendulum 1821
     on Pendulum 8: combination of individual
     results: and <s>[?]</s> conclusion on the amount of
     temperature correction, and on the result of the
     Harton Experiment.

72. The quantity Log Rate of Pendulum 1821/Rate of Pendulum 8 is formed, as a
similar quantity is formed in Section VI, by <s>[?}</s> combining together

Log <s>Rate</s> Rate of Pendulum 1821/Rate of Shelton  +  Log Rate of Shelton/Rate of Earnshaw  - Log Rate of Pendulum 8/Rate of Earnshaw.

Results for the Log Rate of Pendulum 1821 upon Pendulum 8

[Table of Log Rates for Swing 83 to 92 not transcribed]

73. We have now to consider how the individual results of each Series
are to be combined. And here it is to be remarked that the principal
cause of error is not, in these experiments, the uncertainty of
comparison of clocks (which was almost the only source of error
in the experiments at the mine). It is probable that the amount
of uncertainty from this cause is here nearly unappreciable. The principal
sources of error will lie in the circumstances of the pendulum -
                            
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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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