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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                                in the same manner at both stations.
     The mere determination of the relative <s>[?]</s> rates of
the detached pendulum and the clock pendulum, by
the method of coincidence, is accurate almost beyond
conception. I do not see how it is possible that an
error of 0<sup>s</sup>.01 per day can enter from this cause.

Insert from p.79

48. I will now point out the only cause from which,
in my judgement, any perceptible error can arise.
It was my intention that the temperature of the
upper station should be brought, as near as could
practically be done, to that of the lower station. In
the first week however Mr. Deakin was seized with
a sudden and severe illness, and the transmission of
the detailed observations to me was in consequence delayed.
An inequality of temperature which began accidentally was thus allowed to
exist too long to admit of correction. On
comparing the mean of all the upper temperatures
with the mean of all below, I find that the
lower station was warmer than the upper by
                            
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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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