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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                                box-frame, two vertical sides nearly half the height
of the box-frame, two inclined sides, and a horizontal
top about <s>1</s> one-third as long as the bottom. Screws
were tapped through the horizontal base. This apparatus
was placed in the front opening of the box-frame; and,
when the screws were driven, the horizontal top
was forced up to the upper bar of the box-frame so as to
give it all desirable firmness. As the weakened stand, <s>provided</s> furnished
with this apparatus, was evidently firmer than the utmost care; the

other stand, a similar apparatus was provided for
the other stand.
<s>17</s>16. The agate planes, <s>[?]</s> and the knife-edges (which
were much injured by rust), were reground and
polished by Mr. Simms with the utmost care; the
edges being finished to an angle of about 120<sup>o</sup>. On
mounting them at the Royal Observatory, it was found
that they touched the agate planes <s>only</s> only in <s>[?]</s> a few
points; and the singularity of the mode of contact
reminded me so strongly of the contact in Cornwall in
1828 that I do not doubt that one pendulum was the
same and affected by the same  faults. A few interchanges
                            
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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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