chronometers by the proximity of masses of iron. 
373 
TABLE III. 
)eriments and observations on the rates of Chronometers in the vicinity of iron bodies, at the Observatory 
of the Rev. Mr. Evans^ lEoolivich Common. Lat. 51° 29 7 8" North, long. 4' 10" East. 
No. III. Box Chronometer by Barraud (No. 749) Mean detached rate +0.6. 
Days. 
Ther- 
mome- 
ter. 
Clock 
Rate. 
Chronometer 
+ or — at 
Noon. 
Daily Rate 
of Chrono- 
meter. 
Mean Rate 
in each posi- 
tion. 
Gain or Loss 
per day in 
each posi- 
tion. 
Time of 
ten com- 
pass vi- 
brations. 
Proportional 
Magnetic 
intensity. 
Position of Chronometer, Remarks, &c. 
. 1st. to 
r. 11th. 
12 
13 
14 
15 
o 
50 
51 
49 
47 
— 1*4 
— 1 ’ 1 
— 1*5 
/ // 
+ 1 151 
+ 1 149 
+ 1 144 
+ 1 13-9 
} +0-3 
—02 
—05 
—05 
// 
+ 0 3 
+0, 

32'5 
100 
100 | 
r 
■ 
These rates were taken by Captain Lynn, at his 
observatory in toAvn, prior to the Experiments. 
These rates'were taken at Woolwich, before the 
Chronometer was applied to the ball. 
16 
17 
18 
19 
20 
21 
22 
46 
47 
48 
46 
47 
47 
48 
—09 
— 1-05 
— 0 9 
— 105 
+ 1 121 
+ 1 11-7 
+ 1 109 
+ 1 101 
+ 1 8 4 
+ 1 75 
— 09 
—0-9 
—0-4 
—0-8 
— 0-8 
—1-7 
—0-9 
* 
- 
>—0*9 
—1-5 
29 0 
126 < 
— 
Chronometer placed to the south of the ball j 
height from the floor 11*3 inches ; distance 
from vertical through the centre of the ball 
17‘3 inches, corresponding to lat. 35° 16' S. 
long. 90°, and distance from centre IS inches. 
12 o’clock. South. 
23 
24 
25 
26 
27 
28 
29 
30 
451 
47 
48 
47 
49 
48 
50 
48 
— 1-4 
—1-4 
—2'4 
—24 
+ 1 6'8; 
+ 1 63 
+ 1 49 
+ 1 39 
+ 1 32 
+ 1 2-0 
+ 1 0'2 
—07 
— 05 
— 1-4 
—1-0 
—0-7 
— 1-2 
—09 
J 
>—0-9 
—1-5 
300 
117^ 
Placed above the ball ; height from floor 23 
inches ; distance from vertical through the cen- 
tre of the ball 6 inches, to the South ; corres- 
ponding to the lat. 90° S. and central distance 
18 inches. 12 o'clock. South. 
31 
49 
- - - 
+ 0 59'6 
—06 
r 
Same situation as the above, but the distance 
1 1 
2 
48 
51 
— c 2‘ 5 
—i r 
+ 0 59 0 
+ 0 59*3 
— 0’6 
+ 03 
1—0-2 
— 0-8 
25.5 
162 j 
reduced to 12 inches from the centre. 12 
o’clock. South. 
3 
50 
• * • 
+ 0 59-5 
+ 0-2 
a 
• 
4 
49 
—19 
+ 0 58*3 
—1-2 
Placed to the East of the ball : height 6‘5 inches ; 
5 
49 
—2-5 
+ 0 577 
— 0*6* 
0*3 
— 1*5 
35.5 
84 ^ 
distance from vertical 12 inches, or lat. O 0- 
6 
47 
- - - 
+ 0 56-7 
—1*0 
f 
1 
long. 0°. distance 12 inches. 12 o’clock South 
iis Chronometer being so little affected by the action of the iron, our observations on it were discontinued after the 6th, on which 
i t was returned to town ; and by comparison with Greenwich time by Captain Lynn, on the 28th of April, its rate was found to 
i been r"0 per day gaining, which makes the mean rate, as stated above, +0 6. 
