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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                                October 11. Observers for the day, Mr. Dunkin and
     Mr. Ellis, from the end of Swing 38   to the beginning of Swing 41;
     <s>[?]</s> for the night, Mr. Rümken and
     Mr. Pogson, from the end of Swing 41 to the beginning of
     Swing 44.
October 12. Observers for the day, Mr. Simmonds and
     Mr. Criswick, from the end of Swing 44 to the beginning of Swing 47.
     <s>Mr. Criswick</s> for the night, Mr. Dunkin and
     Mr. Ellis from the end of Swing 47 to the beginning of swing 50.
October 13. Observers for the day, Mr. Pogson and Mr.
     Rumker, from the end of Swing 50 to the end of Swing 52.
     <s>[?]</s> The second series was closed at the
     end of Swing 52.
October 14. Mr. Dunkin, with the assistance of Mr. ellis
     and Mr. Pogson, <s>[?]</s> interchanged the pendulums.
October 16. The third series commenced with Swing 53
     Pendulum 1821 above, No.8 below. Observers
     for the day, Mr. Criswick and Mr. Simmonds, from
     the beginning of Swing 53 to the beginning of Swing 55; for
     the night, Mr. Rumkin and Mr. Pogson, from the
     end of Swing 55 to the beginning of Swing 58.
October 17. Observers for the day, Mr. Ellis and Mr. Dunkin,
     from the end of Swing 58 to the beginning of Swing 61;
     for the night, Mr. Simmonds and Mr. Criswick, from
     the end of Swing 61 to the beginning of Swing 64.
October 18. Observers for the day, Mr. Pogson and Mr.
     Rumker, from the end of Swing 64 to the beginning of Swing 67; of which the end
     was observed by Mr. Dunkin and Mr. Ellis. <s>[?]</s> The third series was closed at the
     end of Swing 67. Mr. Dunkin with Mr.
     Ellis interchanged the pendulums at night.
October 19. The fourth series commenced with Swing 68
     <s>commenced</s> begun by Mr. Dunkin and Mr. Ellis.
     Pendulum No. 8 above, 1821 below. Observers
     for the day, Mr. Criswick <s>above</s> and Mr. Simmonds; <s>below</s> 
     from the <s>beginning</s> end of Swing 68 to the beginning of Swing 71;
     for the noght, Mr. Rumken and Mr. Pogson, from the end 
     of Swing 71 to the beginning of Swing 74.
                            
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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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