Account of pendulum experiments undertaken in the Harton Colliery, for the purpose of determining the mean density of the earth, by G. B. Airy
In the small term multiplied by t50, we may consider B/29.27 = 26/25. Then the diminution of the number of vibrations will be [B x 1.655 x 1.006519/1672 x 8.469 x 29.27]  (t50). [0.00226 x 1.655/1672 x 8.469] or B x 0.000004019  (t50) x 0.00000026. In order to <s>[?]</s> correct the number of vibrations observed, so as to produce the number of vibrations which would take place in vacuum, we must multiply the number observed by 1 + B x 000004019  (t50) x 0.00000026 <s>37</s>35. Combining this factor with the factor depending on the <s>[?]</s> temperature of the pendulum, or 1 + (t50) x 0.00000501, the complete factor is 1 + B x 0.000004019 + (t50) x 0.00000475 or (1+B x 0.000004019) x (1 + (t50) x 0.00000475). The logarithms of these factors <s>[?]</s> are B x 0.0000017453 and (t50) x 0.000002063. The following tables will suffice for the examination of the corrections in the succeeding Section.
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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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