Account of pendulum experiments undertaken in the Harton Colliery, for the purpose of determining the mean density of the earth, by G. B. Airy
or we may otherwise express it, Gravity below is greater than Gravity above by 1/19286 part, with an uncertainty of 1/270 part of the excess. The acceleration of a seconds' pendulum below is 2<sup>s</sup>.24 per day, with an uncertainty of less than 0<sup>s</sup>.01. <s>45</s>46. But it is to be remarked that this estimate of the amount of uncertainty is obtained from the amount of uncertainty in each mean as deduced separately from the discordances of the individual results in the group contributing to that mean. In comparing the means, we shall see reason to suppose that the ultimate uncertainty is greater. Thus, though the probable errors of the means of Series 1 and 3 are 10.4 and 11.0, the difference of the means is 48: though the probable errors of the means of Series 2 and 4 are 3.3 and 9.4, the difference of the means is 24. It is likely therefore that some <s>[?]</s> cause of irregularity has occurred, special to each
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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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