37 ® 
Mr. Barlow on the effects produced in the rates of 
TABLE V. 
Experiments and observations on the rates of Chronometers in the vicinity of iron bodies, at the Observav 
of the Rev. Mr. Evans, Woolwich Common. Lat. 51° 29' 8" North, long. 4' 10" East. 
No. V. Box Chronometer, by Parkinson and Fro-dsham. Mean detached rate +0 23. 
r 
Days. 
i'her- 
mo- 
neter. 
Clock 
Rate. 
Chronometer 
+ or— at 
Noon. 
Daily Rate 
of Chrono- 
meter. 
dean Rate 
in each 
position. 
Sain or Loss 
per day in 
each po- 
sition. 
lime of ten 
Compass 
Vibrations. 
Proportional 
Magnetic 
intensity. 
March 25 
26 
27 
28 
29 
30 
<3 
48 
47 
49 
48 
50 
48 
/ ✓/ 
—0 36 1 
) 
> +0-9 
32 '5 
ico j 
L 
—2-4 
—0 35 0 
—0 31'5 
— 0 34-2 
+ T1 
+ 0-5 
+ 0-3 
+ T2 
+ T2 
—2'4 
—0 3T7 
31 
49 
• ••••• 
—0 35 5 
—3-8 
r 
April 1 
48 
—2'5 
—0 39 8 
—4-2 
1 — 3.4 
— 3 6 
27-2 
143 ^ 
2 
51 
—1’7 
— 0 42'2 
—2-4 
1 
3 
50 
• • • • • • 
—0 45 3 
— 3T 
J 
l 
4 
49 
— T9 
—0 47 9 
— 2'6 
I 
f 
5 
49 
—2'5 
—0 5T0 
— 3'1 
} —3-3 
—3-5 
27-2 
143 1 
6 
47 
—0 55'1 
— 41 
J 
l 
7 
50 
—0 58 3 
—3 2 
1 
f 
8 
• • • • 
—T9 
— 0 16 2 
[ —2-5 
—2.7 
2?‘2 
143 \ 
9 
57 
—T9 
—0 17*9 
-17 
I 
l 
10 
58 
—17 
— 0 164 
+ 15 
] 
f 
11 
57 
• • • • • • 
—0 148 
+ T6 
> +0-7 
+05 
27'2 
143 < 
12 
55 
—1’7 
—0 159 
—11 
J 
L 
13 
53 
—2‘ 0 
—0 183 
—2'4 
"1 
f 
14 
52 
• • • • • • 
— 0 219 
—36 
1 
j 
15 
50 
• • . . • • 
~0 25-5 
—36 
—39 
—41 
27’2 
143 ■< 
16 
49 
—0 31-3 
—5-8 
I 
1 
17 
49 
— T9 
—0 35 5 
—4’2 
J 
l 
18 
51 
— 2T 
—0 415 
—60 
1 
f 
19 
53 
— 0 45 0 
—35 
1 
J 
20 
55 
• • • • • • 
—0 47’ 6 
—2-6 
>—3-2 
— 3'4 
* 
< 
21 
57 
—0 49 0 
—1-4 
1 
| 
22 
56 
—2'4 
—0 51*5 
—2 5 
J 
l 
23 
56 
—2'4 
—0 53 2 
—1-7 
24 
60 
— 1-5 
—0 52-8 
+ 0-4 
25 
63 
...... 
—0 52 6 
+ 0-4 
26 
65 
—0-8 
— 0 49-4 
+ 3-2 
► +0-4 
32-5 
100 <| 
27 
63 
—03 
— 0 48 0 
+ T4 
28 
62 
— O' 5 
—0 48’7 
—07 
29 
60 
—09 
— 0 46 6 
+ 2T 
| 
30 
56 
—0 48 3 
— T7 
J 
l 
Position of Chronometer, Remarks, &c. 
hese rates were taken before the Chn 
meter was applied to the ball. This (r 
nometer had not been wound up sined 
tober J 8, 1 820 ; its rate was then —O'! 
from floor; distance from vertical ll i 
ches, or lat. 35° 16' S. long. 90°, centre! 
tance 12 inches. 12 o'clock. South. 
Same situation. 12 o’clock. North. 
up on the 7th. 
12 o’clock. West. Not vu 
Same situation. 12 o’clock. East. 
Same situation ; but the 12 o’clock turnec ? 
to the South, as on March 31st, Apr 1 
and 2nd. 
Placed on pedestal to the South of the ] it 
height above the centre of the plate ] 
ches ; and distance from vertical th'u 
centre of plate, 10 inches. 12 o ) 
South. See description of plate, page 5; 
Detached both from ball and plate, to asr^i 
whether it would return to its fomu 1 
tached rate. 
* The intensity in this case was not taken, in consequence of the plate having been sent on board the Fury, Captain ^.abrY, , 
purpose of correcting the local attraction of that vessel, before it was recollected that this datum had not been obtained. 
