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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                                illuminating lamp was thrown upon the gold leaf. By
shifting the lamp and turning the small cylindrical block,
a brilliant light was reflected to the observing telescope,
the lamp being always in a distant position and in a
lateral direction. Moreover, by slightly inclining the
position of the clock stand, the apparent breadth of the
inclined disk was altered, and it could then be
adapted to disappearance behind the pendulum tail.
The adjustable <s>[?]</s> aperture through which the disk was seen, and which
was covered by the pendulum tail in its quiescent position, was in front of the clock case.
18. By the side of each clock-face, a galvanometer
was fixed. The galvanic wires were led to and
from the terminals of the galvanometer, not immediately,
but through the intermediation of a <s>contact breaker</s> circuit breaker;
so that the observer could at any time interrupt the
current.
19. The journeyman-clock was thus fitted up. Two wires
were led into it, (one from the galvanic battery and the
other in continuation of the course of the same wire from the journeyman to
the next comparison-clock,) terminating within the journeyman in
a pair of springs which performed the duty of
<s>[?]-contact</s> circuit-breaker. Upon the minute-wheel
                            
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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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