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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                                will not produce any sensible effect on the result.

68. The following is the journal of operations;
     Fifth Series. Pendulum 1821 in heat.
1856 <s>[?]</s> Jan 1 Observations commenced a little before noon.
     Mr. Dunkin observed Pendulum 1821 from the
     beginning of Swing 83 to the beginning of Swing 85.
     Mr. Ellis observed Pendulum 8 from the beginning
     of Swing 83 and 1821 from the end of Swing 85,
     to the beginning of Swing 87:

Jan 2. Mr. Dunkin observed 8 from the end of Swing 87
     to the beginning of Swing 89: Mr. Ellis observed
    8 from the end of Swing 89 <s>[?]</s> to the
     Beginning of Swing 91: and Mr. Ellis observed it
     from the end of Swing 91 to the end of Swing 92.
     Mr. Dunkin observed 1821 from the end of Swing 87
     to the end of Swing 92, nearly two hours after midnight. This closed the Fifth Series.

     Sixth Series. Pendulum 8 in heat.
Jan 4. Commencing about 1 1/2 hours before noon, Mr.
     Dunkin observed 1821 from the beginning of Swing
     93 to the beginning of Swing 97. Mr. Ellis observed 8
     from the beginning of 93 to the beginning of 95: Mr.
     Dunkin from the end of 95 to the beginning of 97.
Jan 5. Mr. Ellis observed 1821 from the end of 97 to the
     beginning of 99: Mr. Dunkin from the end of 99 to
     the beginning of 102: Mr. <s>Dunkin</s> Ellis at the end of 102. Mr.
                            
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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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