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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                                insistence of W. Sheepshanks, was so modified
as to admit of incessant observations being made,
day and night, for several days consecutively;
and this arrangement <s>[?]</s> greatly diminished the injurious
effects of chronometer errors. A new difficulty
now presented itself in the orregular and varying form of the
pendulum's knife-edges. After tedious experiments
<s>of</s> on these, which seemed at last likely to be
successful, our labours were suddenly stopped
by the occurrence of a "fall" in the mine. The
lodes or metaliferous veins in the Cornish mines
are usually bounded by nearly parallel planes
inclined perhaps 30<sup>o</sup> or 40<sup>o</sup> to the vertical, and
the removal of the vein stuff (even when, as in
this case, the vacuity has been filled up as much
as circumstances permit) endangers the falling
of the rock which is on the upper side of the lode.
On this occasion, the general fall (in consequence of the
precautions above described) did not exceed a few
inches, but large masses of rock were detached
                            
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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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