acceleration of the pendulum in different latitudes. 171 
having returned to England in the autumn of 1818, the 
clock was disembarked to have its rate in London ascertained. 
Mr. Browne having kindly permitted the observations for 
this purpose to be made at his house in Portland-place, the 
clock was set up in a room adjoining the one in which Cap- 
tain Rater’s Experiments for determining the length of the 
seconds pendulum had been made ; the latitude, as stated bv 
Captain Rater, being 51 0 31' 08", 4 N. and the height above 
the sea 84,5 feet. The clock was going on the 23d of De- 
cember, and the account taken up on the 24th at noon, and 
continued through the ten following days, as shown in the 
annexed Table; the rate of the chronometer with which the 
clock was compared was supplied by Mr. Browne : 
Clock No. 2, London; Barom. mean height 30,31 inches; 
Chron. No. 112, of Arnold losing 0,8* per diem. 
1818. 
Clock fast 
of 112. 
Daily gain. 
Mean 
arc. 
Mean 
temp. 
Corrections. 
Daily Vibra- 
tions. 
Corrections. 
Corrected 
vibrations. 
on 
]12. 
on 
Time. 
Arc. 
Temp. 
Elev. 
Buoy. 
m. 
s. 
s. 
s. 
0 
O 
s. 
s. 
s. 
S. 
Dec. 24 
0 
47.3 
+ 
— 
CO 
00 
8 7’9 
1,664 
45 
4’559 
2, l8 
86490,279 
25 
02 
16 
88,8 
88 
1,69 
45 > 8 
4 > 7°3 
1,838 
86490,861; 
26 
°3 
44,8 
88,9 
88,1 
l >7 
44 > 5 
4’759 
2,398 
86490,461 
27 
°5 
J 3>7 
89 
88,2 
i>7 
45 
4’759 
2,l8 
86490,779 
28 
06 
42,7 
89,1 
88,3 
l >7 
45 
4’759 
2,18 
86490,879 
>+°>35 
+ 6>457 
86497,4. 
2 9 
08 
n,8 
00 
00 
^3 
87,9 
1,76 
44’ 5 
5 ’» 
2,398 
86490,602 
30 
09 40,5 
89,4 
88,6 
1,82 
44 
5 > 45 + 
2,62 
86491,434 
3i 
1 1 
09,9 
1819. 
OO 
00 
87,7 
i,8z 
44 
5>454 
2,62 
8 649°’534 
Jan. 1 
12 
3 8 >4 
00 
0° 
8 7>7 
1,83 
44 
5 > 5«4 
2,62 
86490,594 
1 ' 
2 
14 06,9 
87,6 
86,8 
‘> 8 35 
43’5 
5 >5 44 
2,84 
86489,504 
3 
1 
16 
34’5 
• 
Being 86497,4 vibrations in a mean solar day, in vacuo , at 
the level of the sea ; the temperature being 50°. 
mdcccxxi. Z 
