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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                                33<s>5</s>. The next correction is that depending on the temperature
of the Pendulum. On considering the slight discordance
in the coefficients of expansion found by different
experiments, as well as the difficulty of exactly
identifying the quality of the metal on which they
experimented; <s>[?]</s> it appeared to me best to
adopt the result of Colonel Sabine (Experiments
page 202-207), both because the method of
experimenting was precisely the same as the method of
using the pendulum in these operations, and because
there can scarcely be a doubt that the metal was
similar, as nearly as is possible in different bars.
A small correction is required to Colonel Sabine's
results, because at the time of his drawing the
conclusion as to the effect of temperature, the
ancient erroneous computation for the effect of buoyancy
was still in use. Adopting his multiplier 1.655
of the correction <s>as</s> computed for more statical buoyancy,
as applicable to pendulums of the same form as those
used in these experiments (Phil. Trans. 1829), 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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