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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                                and Pendulum 8 hot and 1821 cool in the Sixth
and Eighth Series; and through the extent of each
Series to keep up the Swings in incessant sequence as
in the observations at Harton. The uncontrolled
conduct of the experiment was intrusted to Messrs
Dunkin and Ellis: and I am confident it will
be found that they are inferior to none that have
ever been made.
     In all cases, the fires for warming the rooms were lighted nearly
24 hours before the observations began.
    67. When the pendulum-boxes were opened
at Greenwich, two of the four thermometers which had
been used at Harton were missing, and all attempts
to trace them have hitherto failed. Two thermometers
belonging to the Royal Observatory (one by Thomas
Jones and one by Houghton & Simms) were
substituted for them. It would have been
desirable to use the very same thermometers which
were used in the Harton experiment: but it is
probable that, with the considerable range of temperature
used in these experiments, the accidental differences
between two thermometers made by makers of repute
                            
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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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