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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                                Third Series. Log Rate of Pendulum 8 below on Pendulum 1821 above.

[Table not transcribed]

Fourth Series. Log Rate of Pendulum 1821 below on Pendulum 8 above.

[Table not transcribed]

<s>41</s>39. On tracing the irregularities in these numbers to their sources,
it will be seen that they arrive almost entirely from the
irregularities in the comparisons of the clocks. The rate
of each pendulum upon its clock is either so constant or
changes by such degrees in the same direction that
there is every reason to presume on the extreme steadiness
both of the detached pendulums and of the clocks.
     Remarking then that, when a large variable error is
combined with a small variable error, the magnitude of the
probable error in the combination is scarcely affected by the 
                            
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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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