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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                                undertake the operation with promptitude and
with the security of using trustworthy instruments,
but also removed one of the most serious <s>[?]</s> causes of
expence. I have already alluded to the
extensive works constructed by the owners of the
Harton Colliery, and which they made entirely
at their own expense: and to the liberality of
the Electric Telegraph Company, who gratuitously
gave me their important assistance in the galvanic
connexions. In transmitting the instruments from
the wharfs at Newcastle to South Shields, Messrs.
Stevenson & Co. of the Jarrow Chemical Works gave the
use of their river craft. The Mayor and Corporation of South Shields, unsolicited, caused the swings to be
made which were needed for computaton of the attraction of the ground. Some parts of the
apparatus (galvanometers, wires, stoves &c,) were
so evidently applicable to the prospective wants of the Royal
Observatory that they were not considered as a charge
on the experiment. The Lords Commissioners of the
Admiralty, on my laying before them my proposals,
contributed £100 <s>for</s> which defrayed the greater part of the miscellaneous
expenses. The residual charges were borne by
myself.
                            
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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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