204 Mr. Fisher on the errors in longitude 
rates of the chronometers, can be reconciled with that ob- 
served in chronometers when under the influence of magnets 
placed in different positions with respect to their balances. 
To determine this, two watches were used, with steel ba- 
lances and horizontal escapements, one by Earnshaw, the 
other by Allan and Caithness ; also two chronometers 
made by Arnold. To each of these watches were applied, at 
a distance of two inches from the balance, magnets of twelve 
inches in length, in four different positions, and in the planes 
of the balances. 
The following Table will show the rates of the watches 
in twenty-four hours, deduced by comparing them with an 
excellent clock with Graham’s dead beat escapement, and 
regulated by transit. 
No. 1. 
No. 2. 
No. 3 . 
No. 4 . 
N 
t II 
+ 9 - * 5 
/ // 
+ 5- 0 
-2 
N 
/ // 
+ 0 34 
/ II 
+ 0.41 
S 
+ 8.12 
+ 21.0 
J 
S 
+ 2.18 
+ 0.44 
N 
/ n 
+ 8.o 
1 // 
-f 18.0 
6 
N 
/ // 
-f 1.28 
/ II 
— *43 
S 
+ 48.0 
+ 8.0 
S 
+ 5- 2 7 
—0.36 
N 
l 1 II 
+ 47 - 1 ° 
/ II 
+ 17. 8 
N 
/ // 
+ 5.22 
/ n 
+ i- 3 
S 
+ 7z. 0 
+ 8 44 
9 
S 
—0.14 
+0.41 
N 
/ // 
+ 4 -H 
1 II 
+ 4-32 
12 
N 
✓ // 
+ 2.47 
/ // 
+ I.I2 
S 
— 2. 0 
+ 15. 0 
S 
— 1. 2 
+ 1.24 
The first column in this table shows the pole of the mag- 
net applied to the watch ; the second and third, the rale or 
effect produced on each watch ; the fourth column shows 
the figure on the face of the watch opposite to which the 
magnet was applied. 
