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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                                agate planes and thermometers, but with no other
apparatus, were to be interchanged, and a week's
observations were to be made in this state. The
The pendulums were to be interchanged a second time
and a third time, so that in the whole four series of
observations would be taken; but I thought it probable
that less than a week would suffice for each of these latter
series.
22<s>3</s>. On considering the amount of labour required for carrying out this plan, and
considering also that it was not in my power to take
an active part, I <s>decided</s> judged that six observers would
be <s>required</s>  necessary. With the <s>permission</s> sanction of the Lords
Commissioners of the Admiralty, I appointed Mr.
Edwin Dunkin and Mr. William Ellis, Assistants
of the Royal Observatory, <s>to</s> as two of the observers.
With the <s>[?]</s> permission of Mr. J. Johnson Esq I was enabled
to solicit and to obtain the services of Mr. Norman
Pogson, assistant of the Oxford Observatory; Professor Challis consented to my asking the
aid of Mr. G.S. Criswich, Assistant of the Cambridge Observatory; <s>[?]</s> by
                            
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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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