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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                                corrections to the numbers in the "Experiments" are as
follows:-
     Page 202, <u>for</u> 6.25 <u>read</u> 10.34; which gives for
     Pendulum 3, 86166.49
     Page203, <u>for</u> 6.2 <u>read</u> 10.26; which gives for Pendulum
     4, 86174.99
     Page 205, <u>for</u> 5.65 <u>read</u> 9.35; which gives for Pendulum
     3, 86149.61
     Page 206, <u>for</u> 5.7 <u>read</u> 9.43; which gives for
     Pendulum 4, 86159.35
     Page 207, the results for 1<sup>o</sup> Fahrenheit will be
     respectively 0.4318 and 0.4300. The
     mean 0.4309 corresponds to 86166 vibrations
     in one day.

Hence, to reduce the vibrations observed at the temperature
1<sup>o</sup> of Fahrenheit to the vibrations which would have
been observed in air of the same density and temperature
50<sup>o</sup>, the number of observed vibrations must be
multiplied by [86166+(t-50) x 0.4309]/86166, or by
1 + (t-50) x 0.00000501. I do not at present form
the logarithm of this quantity, as there will be another
term depending on temperature, introduced by the consideration
of the buoyancy-correction which will be combined with this.
                            
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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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