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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                                agreeably ventilated with pure fresh air. <s>The</s>
<s>[?]</s>
<s>11</s> The owners of the mine immediately
proceeded, at their own expense, to make the
following preparations for the pendulums.
11<s>2</s> In the
stable for the upper station, an additional brick
wall was built round three sides of the space
(about 16 feet square) intended for the pendulum
room, and as additional substantive ceiling was
constructed above it; and an anteroom was
constructed on the fourth side; so that the room
<s>had</s> was in fact surrounded by double walls and ceiling. The immediate
entrance for the external air was into the anteroom;
and for the anteroom there were doors into the pendulum
room and into a narrow room at one side (In <s>which</s> this manner, room
were afterwards placed the galvanic batteries and clock, and the
lamp for illuminating the pendulum disk. The lamp
for illuminating the clock face was in the anteroom,
<s>[?]</s> giving its light through a hole in the dividing
wall; and the observer was stationed in the anteroom,
his observing telescope being fixed in a hole in the
wall.). From the gas-works of the mine, gas was
                            
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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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