372 
Mr. Barlow on the effects produced in the rates of 
TABLE II. 
Experiments and observations on the rates of Chronometers in the vicinity of iron bodies, at the Observah 
of the Rev. Mr. Evans, IVoolwich Common. Lat. 51° 29' 8" North, long. 4' 10" East. 
No. II. Pocket Chronometer, in' Silver Cases, by Arnold. 
Ther- 
Clock 
Rate, 
Chronometer 
Daily Rate 
Vlean Rate 
Gain or LossITime of 
Proportional 
Days. 
mome- 
ter 0 
+ or — at 
Noon, 
:>f Chrono- i 
meter. 
n each po- 
sition. 
each posi- 
tion. 
tass Vi- 
rrations. 
Magnetic 
intensities. 
Position of Chronometer, Remarks, &c. 
Mar. 1st. to 
> " 
J +6-0 
r/ 
+ 6-0 
f 
These rates were taken by Captain Lynn prio 
Mar. 11th 
i 
the experiments. 
12 
o 
50 
— T4 
/ 11 
+2 32 1 
'j 
r 
13 
14 
51 
49 
— ri 
+2 37-0 
+ 2 421 
+ 4 9 
+ 51 
[+5-0 
00 
325 
100 -j 
These rates were taken at Woolwich before 
Chronometer was applied to the ball. 
15 
47 
—15 
+ 2 47*1 
+ 5*0 
J 
l 
16 
ir 
46 
47 
—*0 9 
+2 59*6 
+ 62 
r 
| 
Chronometer placed above the ball; height fi 
floor 23 inches, distance from vertical thro 
18 
19 
20 
48 
46 
47 
— 105 
—09 
— 105 
+ 3 6 5 
+ 3 13-1 
+3 198 
+ 6'9 
+ 6 6 
+ 67 
>+6-5 
+ 15 
30-0 
H7 < 
the centre 6 inches, to the South ; correspc 
ing to lat. 90° South, and distance 18 incl 
12 o'clock. North. 
21 
47 
* * “ 
+ 3 26 3 
+ 6'5 
J 
L 
22 
48 
— — • 
+ 3 321 
+ 5'8 
1 
r 
23 
45f 
— 1-4 
+ 3 37 3 
+ 5-8 
> + 5-8 
+ 08 
32-5 
100 \ 
Detached from the ball. 
24 
47 
—1-4 
+ 2 7-5 
J 
l 
25 
48 
- - - 
+2 13 0 
+ 5*5 
- 
26 
47 
- - - 
+ 2 18'2 
+ 5'2 
l'he Chronometer was placed in anew situa 
27 
28 
49 
48 
— 2’4 
+ 2 24T 
+ 2 28 9 
+ 5*9 
+ 4-8 
> + 5’2 
+ 02 
32-5 
100 
on the 23rd ; but in consequence of its b< 
suffered to go down on the 23rd at nigh' 
29 
50 
- - - 

... 
was kept detached till the 30th, to be re-ra 
30 
48 
—2’4 
+ 2 39 1 
+ 5-1 
J 
l 
31 
49 
- - 
+ 2 44-8 
+ 57 
I 
f 
Placed to the N. of ball ; height 10J inches; > 
April 1 
48 
— 2'5 
+ 2 51-0 
+ 6-2 
? +67 
+ 09 
33-5 
94 ■> 
from vertical 1T31, corresponding to lat. 
2 
51 
—1-7 
+ 2 57-3 
+ 6-3 
J 
l 
long. 90°, dist. from centre 12 in. 12 o’cloc 
3 
50 
- • ~ 
+2 38 
- - - 
1 
r 
4 
49 
— T9 
+ 2 42 8 
+ 4*8 
[+47 
—0 5 
32*5 
100 4 
Detached again from the ball. 
5 
49 
—2-5 
+ 2 47‘3 
+ 4-5 
1 
l 
6 
47 
_ 
+ 2 52-8 
+ 5-5 
1 
r 
Placed above the ball ; height from floor ’ 
7 
50 
... 
+ 2 57-4 
+ 4*6 
1 
i 
inches ; distance from vertical 4 inches, to 
8 

—19 
+ 3 3 9 
+ 6'5 
> + 5‘0 
1 
- 02 
25-5 
162 < 
South ; corresponding to latitude 90° So 
9 
57 
—1-9 
+3 7'7 
+ 3'8 
1 
and distance from centre 12 inches. 12 o' elf 
10 
58 
—1-7 
+ 3 12-6 
+ 4-9 
J 
l 
South. 
11 
12 
57 
55 
—20 
+ 3 16-8 
+ 3 20’5 
+ 4-2 
+ 3-7 
|+4-0 
—1-2 
300 
a- { 
Same latitude, but at the distance of 18 inc. 
as on the 16th March. 12 o’clock, Soutl 
13 
53 
+ 3 25-8 
+ 5-3 
f 
14 
52 
- - = 
+ 3 29 9 
+ 4-1 
As this chronometer appeared to be increasing 
15 
50 
- - - 
+ 3 34T 
+ 42 
J 
J00-< 
rate, or rather decreasing its losing rateii 
16 
49 
* " 0 
+ 3 38 6 
+ 4’5 
>+4-3 
—0*9 
32-5 
dependent of the action of the iron, it was 
17 
49 
—T9 
+ 3 42 4 
+ 3-8 
tached during these days, and our obse 
18 
51 
— 2T 
+ 3 46-3 
+ 39 
tions with it discontinued. 
19 
53 
+ 3 50 4’ 
+ 4-1 
- 
The numbers in column 7 are drawn from comparison with each preceding detached rate, and not from the mean detached rati 
is done in the following Tables. 
1 
i 
