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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                                <s>15</s>14. The local arrangements being thus brought to a
very satisfactory state, I had <s>[?]</s> next to provide
the proper apparatus. On my request, through
Colonel Sabine, Treasurer of the Royal Society,
the Council of the Society immediately placed at
my disposal the instruments which they possessed and which applied to my wants. These were
two invariable pendulums, both by Thomas
Jones, (distinguished by the marks "1821" and "No. 8" respectively)
<s>[?]</s>, which were preserved in the Kew Observatory;
iron stands for the <s>[?]</s> pendulums, accompanied
by wooden stands for the comparison clocks,
preserved in the Magnetic Office at Woolwich;
and a clock by Shelton (which I had formerly
used in Cornwall, and which still bore my
paper marks upon its pendulum). To these I
added a clock by Earnshaw (from the South
dome of the Royal Observatory), a journeyman
clock (from the Royal Observatory) to be used in
signal-transmission; two galvanometers, similar
                            
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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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