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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                                       Section VIII. Estimation of the Mean Specific
     Gravity of the Surface Rocks; and
     final conclusion on the Mean Density of
     the Earth, as determined from the
     Pendulum Experiment.

61. By the kindness of Mr. Arkley, I was furnished
with a complete account of the strata passed through in sinking
the Harton shaft, and with specimens of a great number of
the rocks. These were submitted to Professor W.H. Miller,
who with great labour determined their specific gravities.
I place below the entire catalogue and measure of the
strata, and the results at which Professor Miller arrived.
Professor Miller remarks that there is inevitable uncertainty
in the estimation of the weight of those specimens which
drawn from beds described as containing water.

[Table of specific gravities not transcribed - Samples No. 1 -15]
                            
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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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