chronometers by the proximity of masses of iron. 
371- 
TABLE I. 
miments and observations on the rates of Chronometers in the vicinity of iron bodies, at the Observatory 
of the Rev. Mr. Evans, Woolwich Common. Lat. 51° 29' 8" North, long. 4 r 10" East. 
It 
No. I. Pocket Chronometer in Gold Cases, by Earnshaw. Detached rate — 3 '“ 2 . 
ays. 
Ther- 
mo- 
meter 
Clock 
Rate. 
Chronometer 
+ or — at 
Noon. 
Daily Rate 
of Chrono- 
meter. 
Mean Rate 
in each 
position. 
Gain or Loss 
per day in 
each po- 
sition. 
Time of ten 
Compass 
Vibrations. 
Proportional 
Magnetic 
intensity. 
Position of Chronometer, Remarks, &c. 
Mar. 
1 z. 
2 
3 
4 
5 
\ 
— 3-2 
— 3‘2 
— 3'2 
— 4 *i 
2-1 
V2 
u 
0-0 
0-0 
These rates were taken prior to the experi- 
ments by Mr. Evans. 
These rates were taken before the Chrono- 
meter was applied to the ball. 
i 0 
5 ° 
51 
49 
47 
—f 4 
— n 
— »'5 
// 
+ 48-4 
+ 45 ‘2 
+ 4 rI 
+ 39 '° 
j 
j- — 3’2 
/✓ 
32-5 
IOO ^ 
6 
46 
r 
Chronometer to the South of the ball; 2-1 in- 
7 
47 
—0-9 
+ 32-0 
— 3'5 
ches from the floor, and distant from the ver- 
8 
48 
— 1-05 
4-28-1 
— 3'9 
c r .< 
QI ^ 
tical, passing through the centre of the ball. 
9 
46 
—0-9 
4-20-9 
— 7 ' 2 
> 5 ° 
2 5 
34 0 
1 
17-31 inches, corresponding to lat. o°, long 
0 
47 
—1-05 
4 - 12-8 
—8-i 
90 0 , and distance from centre 18 inches. 
1 
47 
+ 5 'o 
-7-8 
J 
L 
12 o’clock. South. 
his Chronometer was detached from the ball on the 21st, and its rate taken fora few days ; but as it was very irregular, our obser- 
> on it were discontinued after the 24th. The mean rate of this Chronometer is assumed — 3 "-z. 
3 B 
)CCCXXI. 
