1
Richmond17 Dec. 1770.
2
One side of the needle.20°36West
3
other side2152–
4
42.28
5
mean Variation21.14.W. at Noon
6
Richm.17. Dec. 1771.
7
one side of the needle21.55.
8
other side2045
9
42.40
10
mean Var.21.20.
11
Richmond17. Dec. 1772.
12
One side of the needle21.12
13
other Side22.20
14
4332
15
mean Var:21.46
16
Richmond.17. Dec. 1773.
17
one side – – –21.20
18
other2230
19
–4350
20
mean Var.2155 |
21
9v = 3Richmond1774 d. 17 Dec:
22
One side.22.10
23
other side22.0
24
4410
25
mean22.5
26
Variation
28
1771Richmond21.20
29
1772Richmond2146
30
1773Richmond2155
32
There are 26 Years elapsed since Mr Grahams last observation in
33
1748 that brought the Variation to 
per Year. Until the last
per Year. Until the last
34
Richmond Observation in 1774 that increases the westward Vari-
35
ation by 4° 25 in 26 Years which would reduce the Variation to
36
nearly 
minutes per Year.
minutes per Year.
37
But the above is submitted by D. Demainbray.