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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                                which alone the disk can be seen, as indication of
the coincidence of the two pendulums in the times of
passing their respective quiescent points: and
supposing that there are trifling errors in the adjustments
of positions: it is <s>easily</s> seen in practice, or is shown
by a very simple investigation,that the disk will
first disappear in passing from one side (suppose the
right side) toward the center, then will disappear in passing from the
left side, <s>[?]</s>(after which, if the errors of adjustment
are in the proper direction, it will be invisible during
several vibrations), then it will reappear on the left
side, and will finally reappear on the right side, Either
the mean of the times of the first and fourth phenomenon, or the
mean of the second and third, or the mean of all
four, may be used as the true times of coincidence: and
it was left to the discretion of the observer to adjust
which they preferred. They chose, in every case,
to observe the first and fourth only. This amounts in
fact to using only one side of the aperture.
     It is necessary for the success of this observation that
the arc of the detached pendulum be less than that of the
clock pendulum: in fact it was always much less.
It is indifferent whether the detached pendulum vibrate
                            
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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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