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>22</s>21. The system of observation which I proposed was
the following. One of the invariable pendulums was to
be mounted at the upper station and the other at the
lower station, and <s>[?]</s> the two pendulums
were to be observed simultaneously by two observers.
The "swings" or series of vibrations were to follow each other
incessantly, day and night, with no more interruptions
than <s>[?]</s> would be required for observing the galvanic signals,
reading thermometer, and making petty adjustments.
Six <s>series</s> swings (each occupying the gross four hours) were
to be taken in each day. At concerted <s>times</s> minutes
of time before the first and after the last swings, and
between the end of each preceding swing and the beginning of
that which followed, galvanic signals were to be
observed. <s>[?]</s> Several "coincidences" of the
vibrations of the detached pendulum with the
clock pendulum were to be observed in Kater's
manner at the beginning and end of each swing. This
system was to be maintained during the whole efficient
time of one week; then the pendulums with their
                            
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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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