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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                                - comparisons were not trustworthy. We resumed the
work, with a modification of the method of using the
chronometers which promised to render the results
[<s>?</s>] more accurate. We were raising the lower pendulum
up to the South Shaft [<s>?</s>] for the purpose of inter-
changing the two pendulums, when (from
causes of which we are yet ignorant) the straw
in which the pendulum-box was packed took fire,
the lashings were burnt away, and the pendulum
with some other apparatus fell to the bottom.
This terminated our operations of 1826.
8. In the summer of 1828 we again attempted
the experiment, in the same localities, and with the
same general instrumental means. Our personal
powers however were far greater than in 1826.
We had now the assistance of the Revd. R.
Sheepshanks and of two junior observers (my
brother Mr. now the Revd. W. Airy, and the late
Rev. S. Jackson). Our plan, principally at 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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