Account of pendulum experiments undertaken in the Harton Colliery, for the purpose of determining the mean density of the earth, by G. B. Airy
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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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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