Account of pendulum experiments undertaken in the Harton Colliery, for the purpose of determining the mean density of the earth, by G. B. Airy
established at the Royal Observatory, and in the familiarity which we now possessed with telegraphic applications. I perceived that the difficulty of comparing the upper and lower clocks would be almost entirely removed. The coal-mines of the Durham coalfield had been marked much deeper, and the facility of access to those mines would materially diminish the labour of the experiment, while the intimate acquaintance <s>[?]</s> with the geological character of the country possessed by the coal-owners, and the general regularity of the beds, would give great confidence <s>to</s> in the ultimate calculations of the attraction of the mass of matter principally affecting the experiment. After a lapse of twenty-six years from the last attempt in Cornwall I therefore seriously took up the subject again, and proceeded personally to examine the fitness of the coal-mines of Durham for the experiment.
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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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