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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                                1211 feet of rocky and shaly beds, specific gravity 2.56
30 feet of coaly beds,    specific gravity 1.43
15 feet completely washed out,    specific gravity 0.00

63. Substituting this for d in the expression of the end
of the last section, we get for the mean density of
the Earth, as determined from the experiments
     6.566 ± .0182
where the last term (expressing the probable error) ought
to be at least doubled.

64. The value thus obtained is much larger than
that obtained from the Schehallien experiment, and
considerably larger than the mean found by Baily from
the torsion-rod experiments. It is extremely difficult to <s>[?]</s>
<s>[?]</s>
assign with precision the cause or the measures of the errors
of any of these determinations: and I shall content myself
with <s>[?]</s> expressing any opinion that the value now presented
is entitled to compete with the others on, at least, equal terms.

Royal Observatory, Greenwich
1855 December 24        G B Airy
                            
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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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