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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                                my views, and, after the proper surveys for elevation,
furnished me with a map extending about 3 miles in
all directions round Harton, with the elevations above high
water in feet marked at numerous points. I found that
a line might be drawn nearly 10 depths distant from <s>[?]</s> the upper
station, touching the cliffs of Tynemouth and the cliffs south
-east of Harton, and ranging for some distance along the coast
of Durham. I therefore drew a line parallel to this at
10 depths distance from the upper station: and divided the
whole country into squares (with sides of one depth each) whose sides were parallel and
perpendicular to this. These squares I grouped as appeared
most convenient as will be seen in the Map, figure 4 (the principal object being to secure a
proper representation of Jarrow Slake and the Valley
of the Tyne), and adopted for each group the elevation
in feet above high water which <s>[?]</s> Mr. Thompson's
elevations of special points suggested. <s>[?]</s> The
<s>[?]</s> elevation of the upper pendulum station was
74 feet. Consequently the <s>[?]</s> vertical measure
which was to be used for computing the "volume" in the
formula above was [Elevation - 74]/1256. Of this formula,
a small table was prepared. The quantity p was measured graphically
from the map, and √[p<sup>2</sup> + 1] was formed graphically from it.
                            
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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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