378 
Mr. Barlow on the effects produced in the rates of 
TABLE VI. 
Experiments and observations on the rates of Chronometers in the vicinity of iron bodies, at the Observato , 
of the Rev. Mr. Evans, Woolwich Common. Lat. 51 ° 29 ' 8 " North, long. 4 ' 10 " East. 
No. VI. Box Chronometer, by Parkinson and Frodsham. Mean detached rate — 0 39 . 
Days. 
rher- 
mo- 
neter. 
Clock 
Rate. 
Chronometer 
+ or — at 
Noon. 
Daily Rate ] 
of Chrono- 
meter. 
Vlean Rate 
n each po- 
sition. 
3 ain or Loss 
per day in 
each po- 
sition. 
Time of ten 
Compass 
vibrations. 
Proportional 
Magnetic 
intensity. 
Position of Chronometer, Remarks, &c. 
April 9 
JO 
1 1 
12 
O 
57 
58 
57 
55 
—1-9 
—17 
• • • • • 
—17 
/ // 
+ 3 » 6 7 
+ 3 l 7 ’° 
+ 3 1 7 ‘ 1 
+ 3 > 7-2 
+ °'3 
+ OM 
+ 01 
j +02 
32-5 
IOO 
These rates were taken before the Chronome 
was applied to the ball. 
! 13 
*4 
>5 
1 6 
1 7 
53 
5 2 
5 ° 
49 
49 
2"0 
• • • • • • 
• • • • • • 
+ 3 i 7‘2 
+ 3 15-7 
+ 3 » 4'2 
+ 3 12-4 
+ 3 10-5 
0*0 
—i -5 
—is 
—i-8 
—i *9 
1 
1-3 
—0-9 
33 
97 
Placed to the East of ball ; height from fit 
2 inches ; distance from vertical in inch 
corresponding to lat. 20°45' N. long. 4 
distance from centre 12 inches. 12 o’cloi 
South. 
—i- 9 
1 8 
1 9 
20 
2 I 
22 
5 1 
53 
55 
57 
5 6 
2*1 
• • • • • t 
• • • • • • 
— 2-4 
+ 3 9'2 
+ 3 7 ' 1 
+ 3 5 ‘ 6 
+ 3 4'2 
+ 3 2-9 
—i -3 
2-1 
—i '5 
— 1-4 
— 1‘3 
u 
— ri 
33 
r 
97 < 
l 
Similar situation, and at the same distance 
the West of the ball. 12 o’clock, South. 
23 
24 
25 
56 
60 
6 3 
— 2'4 
— *'5 
+ 3 °'5 
+ 2 59'5 
+ 2 58 2 
—2-4 
1*0 
—1-3 
1 1 6 
J 
1*2 
3°'5 
127 1 
Placed to the North of the ball ; height 2 incl 
distance finches; or lat. 3 7 ^o'N. long. 9 
central distance 1 4-6 inches. 1 2 o’clock. Sot 
26 
27 
28 
29 
3 <* 
65 
63 
62 
60 
1 5 6 
— o*8 
—o -3 
—0-5 
—0-9 
• © e e> 
+ 2 57 -° 
+ 2 57 3 
+ 2 57-6 
-f2 56-8 
+ 2 55'2 
— 1 *2 
+ o '3 
+o ’3 
— o - 8 
— 1-6 
— o - 6 
32-5 
100 < 
1 
Detached ; and the farther observations tra 
ferred to the Royal Military Academy. 
I 
