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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                                is the laundry of the Dwelling House; a room on
the basement story, almost entirely sunk below the
level of the lawn and Front Court, but bordered on
two sides by a dry Area: with stone floor laid
immediately upon the solid ground. The chimney-
opening and other crevices were carefully stopped up,
and a hot-air-stove with funnel leading into the
chimney was planted in the room: by means of this
stove the temperature of the room could be maintained
with reasonable steadiness nearly to 90<sup>o</sup> Fahrenheite.
The pendulum 8 with Clock Earnshaw were
mounted in the usual way in this room. A screen
was placed between the stove and the pendulum,
which effectively prevented the pendulum and its thermometer from
receiving any sensible heat by radiation. The
other room is the Lower Record Room, a room
with stone floor laid (except at its center) upon the solid ground,
<s>[?]</s> warmed by a heating apparatus below
the <s>floor</s> center of the floor. The Pendulum 1821
                            
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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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