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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                                (local viewer and superintendant of the mine works)
on 1854 August 5 I examined the buildings on
the surface and the workings underground in the
"Bensham seam", and stations for the pendulums
more speedily chosen. The two stations were
exactly in the same vertical. The upper station was
a stable near the mine office. The lower
station was a wide part of a gallery (now
disused) less than 200 yards from the bottom of
the shaft; in going from the bottom of the shaft to the
station, one-half (roughly speaking) of the way
passed along <s>the</s> one of the tram-ways of the mine,
and the other half was along the disused gallery;
and at this distance the sound of the coal-trains
&c on the tram-way was inaudible. The Harton
shaft is the downcast air-shaft for a very
extensive series of workings, of which the
upcast shaft is at the Hilda pit in the town
of South Shields; and the lower pendulum station, from its
proximity to the <s>Hilda</s> Harton pit, was constantly and
                            
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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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