180 
Colonel Beanfoy m the Retrograde 
the corresponding months of tlie first year. The needle then 
became constantly increasing in January, diminishing in Febru- 
ary, and increasing again in March the same year, since which 
time it has decreased, as may be seen by the corresponding 
monthly variation of the second and third years. 
It is on recoi-d, that in 1658 the compass pointed to the true 
north : the western variation has therefore been increasing for 
162 years, and is now retrograde; but what is the limit of the 
eastern declination, remains to be determined, as I cannot find 
an}' observations on the variation of the compass prior to 1580, 
at which time it was 11° 15' east. I remain, Dear Sir, yours 
very sincerely, Maiik Beaufoy. 
TAB LI], coiitahimg the M(wmng, Noon and Evening Months 
ly Mean Variation of the Magnetic Needle for Three Years. 
Variation West. 
1817. 
Morning, 24 31 52 
1818. 
1819. 
Off/ 
( 
f 
Morning, 24 34 06 
( 
Morning, 24 32 36 
April, e 
Noon, 24 44 43 
April, j 
Noon, 24 44 50 
April, -j 
Noon, 24 43 09 
Evening, 24 35 58 
Evening, 24 36 36 
Evening, 24 34 59 
( 
Morning, 24 32 20 
f 
Morning, 21 36 18 
( 
Morning, 24 32 42 
May, 1 
Noon, 24 42 35 
May, ^ 
Noon, 24 45 49 
May, ] 
Noon, 24 41 22 
( 
Evening, 24 34 45 
Evening, 24 38 35 
( 
Evening, 24 34 10 
( 
Morning, 24 31 09 
( 
Morning, 24 33 47 
Morning, 24 31 28 
June, J 
Noon, 24 42 14 
June, J 
Noon, 24 45 11 
June, -< 
Noon, 24 41 41 
1 
Evening, 24 34 45 
( 
Evening, 24 37 40 
1 
Evening, 24 35 09 
i 
Morning, 24 31 14 
Morning, 24 34 24 
i 
' Morning, 24 32 31 
July, 4 
Noon, 24 42 06 
July, 4 
Noon, 24 44 59 
July, A 
Noon, 24 42 12 
( 
Evening, 24 35 43 
1 
Evening, 24 38 14 
1 
^Evening, 24 35 37 
'Morning, 24 31 16 
Morning, 24 34 40 
j 
[Morning, 24 32 33 
Aug. A 
Noon, 24 42 51 
Aug. J 
Noon, 24 45 58 
[ Evening, 24 37 50 
Aug. j 
Noon, 24 42 49 
Evening, 24 33 45 
[Evening, 24 34 24 
1 
[Morning, 24 33 02 
[■ Morning, 24 34 29 
( 
[Morning, 24 32 29 
Sept.^^ 
Noon, 24 41 36 
Sept, -j 
Noon, 24 45 22 
Sept. -< 
Noon, 24 41 35 
1 
[ Evening, 24 34 38 
[Evening, 24 37 28 
[Evening, 24 33 27 
1 
1 Moi-ning, 24 31 06 
( 
r Morning, 24 35 36 
( 
[ Morning, 24 33 27 
Oct. -< 
Noon, 24 40 46 
Oct. -( 
Noon, 24 43 28 
Oct. ^ 
Noon, 24 40 08 
1 
Evening, 
1 
(Evening, — ■ — — 
1 
( Evening, 
1 Morning, 24 31 49 
1 
( Morning, 24 33 24 
1 
( Morning, 24 32 42 
Nov. - 
J Noon, 24 37 55 
Nov. - 
Noon, 24 41 41 
Nov. - 
Noon, 24 38 43 
( Evening, — 
1 
( Evening, 
1 
( Evening, 
1 Morning, 24 34 03 
i Morning, 24 37 04 
( Morning, 24 33 29 
Dec. - 
4 Noon, 24 38 02 
Dec. - 
1 Noon, .24 41 20 
Dec. - 
1 Noon, 24 37 20 
Evening, — 
(Evening, 
( Evening, — 
1 818, 
pMorning, 24 34 02 
1819. 
I M orning, 24 35 42 
^ 1820. _ 
Jan. 
( Morning, 24 34 06 
Jnn. 
< Noon, 24 39 57 
f Evening, — — 
Jan. 
< Noon, 24 39 54 
( Evening, 
} Noon, 24 37 54 
(Evening, — 
i Morning, 24 34 22 
(Morning, 24 34 17 
(Morning, 24 32 19 
Feb. ■ 
Noon, 24 40 51 
(Evening, 
Feb. • 
1 Noon, 24 39 55 
1 Feb. - 
} Noon, 24 38 07 
(Evening, 
( Evening, 
( iMorning, 24 33 Ifi 
( Morning, 24 33 18 
( Morning, 24 30 47 
Mar. 
1 Noon, 24 41 37 
' Mar. • 
\ Noon, 24 41 42 
! Mar. - 
\ Noon, 24 39 33 
( Evening, 24 33 47 
( Evening, 24 35 17 
(Evening, 24 33 45 
