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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                                     Section VII. Measure of the difference of level
     of the two pendulum-Stations: survey of the
     neighbouring country: and computation of the
     difference of attraction of the Earth's shell on the two
     pendulums, upon an assumed value of density.

49. For measuring the depth of the mine, Mr. Simms furnished an iron wire 100 feet long with an attached
scale at each end. After the operation, this wire
was returned to Mr. Simms, and was found to have
preserved its length sensibly unaltered. It was
used by Mr. Arkley to measure the depth, in the
following manner. Mr. Arkley placed himself on
the <s>[?]</s> top of the "Cage" in which the coal trams are
conveyed from the bottom <s>[?]</s> of the shaft to the
top, and, when it was lowered 100 feet, an Assistant
attached himself to the strong wire-rope on which
<s>[?]</s> the cage is suspended. The Assistant carried the upper end
of the measuring-wire, and in the first instance
held it level with the top of the shaft (the steam
engine used for raising or lowering the cage being stopped): Mr. Arkley noted the position
                            
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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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