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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                                with Clock Shelton were mounted in one side
of this room. As a hot-air-pipe rises in the
center of the room, this pipe also was screened
to prevent unfair radiation on the pendulum &c:
although here the necessity for such caution was
far less pressing then in the Laundry.
     66. The plan proposed for operations was;
to compare the clocks, by carrying a Solar Chronometer
from one to the other, and observing their readings
at the time of coincidence of beats; (a method
which admits of extreme accuracy when the
clocks are so near together that the chronometer
can be carried without risk of disturbance);
to divide the operations into four Series, numbered
in sequence Fifth, Sixth, Seventh, Eighth; <s>and</s>
to make no alteration whatever in the pendulums,
nor even to dismount them, between one Series
and another; but to make Pendulum 1821 hot
and 8 cool in the Fifth and <s>[?]</s> Seventh Series, 
                            
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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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