Account of pendulum experiments undertaken in the Harton Colliery, for the purpose of determining the mean density of the earth, by G. B. Airy
of my visits, were greatly increased by the <s>[?]</s> uniform kindness of the authorities of the mine, and by the hospitable attentions of Robert Ingham Esq. Mr. P. John Robinson Esq. Mayor of South Shields, James Mather Esq, J.C. Stevenson Esq. of the Jarrow Chemical Works, and other gentlemen resident in the town or neighbourhood. Attendants in the mine were selected and placed <s>at</s> under the command of the observers by the owners of the mine. <s>24</s>23. I may now give a brief journal of the operations. 1854 August 5. I examined the mine, and stations were selected. Instruments were procured, repaired, and sent to the Harton Mine; and observers were collected. Sept 26. I went to South Shields. Sept 27. I erected the clocks and pendulum at the upper station. Sept 28. I erected the clocks and pendulum at the lower station. In the evening, four of the observers arrived. Sept 29. In the morning, the remaining observers arrived. All were employed in adjusting the pendulums &c and in the practice of observations.
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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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