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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                                of the lower end of the mine (to which a small
stretching weight was attached) and fixed a small
nail on the brattice opposite to that lower end.
Then the cage was lowered 100 feet: the Assistant
held the <s>[?]</s> top of the wire to the nail so fixed,
and Mr. Arkley drove a second nail in the
brattice opposite the lower end: and so on to the
bottom: the last fraction of 100 feet being measured
with a measuring tape. After this, the
lvels of the pendulum-stations were referred to the
top and bottom of the shaft by the ordinary
surveyor's levelling operations.
     The following is an abstract of the result:-

Depth of the shaft     <u>1263<sup>ft</sup>.6<sup>in</sup></u>

Rise of the floor of the mine from the
point of measurement at the bottom
of the shaft to the floor of the
lower pendulum station         4.9 3/4

Fall of the surface from the point of
measurement at the top of the shaft
to the floor of the upper pendulum station                  2.7 1/4

Distance between the floors of the
upper and lower pendulum stations  <u>1256.1</u>  
                            
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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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