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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                                to the ordinary speaking needle of the galvanic
telegraph; galvanic batteries, barometers, thermometers &c. Every
<s>[?]</s> instrument was brought, for trial, to the
Royal Observatory.
15<s>16</s>. <s>[?]</s> Each iron stand<s>s</s> <s>[?]</s> consists of
a horizontal triangle of iron bars for bases, two
inclined iron bars in a vertical plane for front, their
tops being screwed to the sides of an iron box-frame
which supports the agate-frame on which the knife
edge vibrates; and one inclined bent iron bar behind,
screwed to the back of the same box-frame. On erecting
on of the stands at the Royal Observatory, it was
found impossible to pass the upper brass block of the
pendulums (to which the steel knife-edge is screwed)
through the holes of the <s>[?]</s> box-frame. It was nedessary
therefore to enlarge the holes by filing; and as this
weakened the <s>box</s> front of the box-frame, the following
apparatus was introduced in order to strengthen it. A
small hexagonal view frame was prepared, consisting of a horizontal
base nearly equal in length to the interior measure of the
                            
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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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