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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                                shaft, near the junction of the granite and the killas,
in the 180 fathom level (the depth being measured
from the adit for the discharge of the water pumped
from the mine), or nearly 1200 feet below the
surface. This place, as is usual in the Cornish
mines, could only be reached by ladders.
7. Our intention was, to compare the vibrations
of a detached pendulum in each station with the
vibrations of a clock pendulum, in the manner which
has acquired so much celebrity from the labours of
Kater and Sabine, and to compare the two clocks
by means of chronometers carried on the person of
an attendant. One set of observations, extending
over several hours (including if necessary more than
one series of coincidences) was to be observed each day.
When this should be carried far enough, the pendulums
were to be reversed and the observations were to be repeated, or the two pendulums were to be compared, as might seem
best. After overcoming some difficulties, and with
very great personal labour, we found on computing
approximately the results that the chronometer -
                            
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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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