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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                                     to the end of 118: Mr. Dunkin from the
     beginning of 119 to the beginning of 121' and
     Mr. Ellis from the end of 121 to the end of 122.
    Mr. Ellis observed 8 from the end of 117 to the
    end of 122, about 2 hours after midnight.
     This terminated the Eighth Series, and the
     whole operation.

       Section X. Comparisons of Clocks.
     The following table contains the mean
of each group of comparisons; and the computation
of the Log Rate of Shelton upon Earnshaw.

69. The clocks were compared by means of a Solar Chronometer
sometimes three times and sometimes four times at
each interruption of Swings. When there are three
comparisons, all are made by one observer: when there
four they are usually (but not in every case)
made by two observers. The <s>[?]</s> discordance of the
different comparisons in each group does not exceed
0<sup>s</sup>.01 or 0<sup>s</sup>.02.
                            
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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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