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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                                     Ellis observed 8 from the end of 97 to the
     end of 102, about 1 1/2 hours after midnight.
     This closed the Sixth Series.

      [ Seventh Series. Pendulum 1821 in heat.
Jan 8. Commencing about 2 hour before noon, Mr.
     Dunkin observed 1821 from the beginning of 103
     to the beginning of 105; and Mr. Ellis from the
     end of 105 to the beginning of 107. Mr. Ellis
     observed 8 from the beginning of 103 to the
     beginning of 107.
Jan 9. Mr. Dunkin observed 1821 from the <s>beginning</s> end
    of 107 to the end of 112. Mr. Dunkin
    observed 8 from the end of 107 to the beginning
    of 109; Mr. Ellis from the end of 109 to the beginning
   of 111; and Mr. Dunkin from the end of 111 to
  the end of 112, about 1 1/2 hours after midnight. This
     closed the Seventh Series.

     Eighth Series. Pendulum 8 in heat.
Jan 11. Mr. Dunkin observed 1821 from the beginning
     of 113 to the beginning of 117. Mr. Ellis observed
    8 from the beginning of 113 to the beginning of 115:
     Mr, Dunkin from the end of 115 to the beginning of
     117.

Jan 12. Mr. Ellis observed 1821 from the end of 117
                            
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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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