or HOT-EOLLED AND COLD-EOLLED MALLEABLE lEON. 
281 
Experiment 12, February 20, 23'’. 
The flagstones had been removed, and the bars were lying on the wooden boards of 
the equatorial plane, with the lettered end upwards. Each bar was slightly rapped three 
times with a wooden mallet, weighing about 1-| lb. 
Hot-rolled 
Hot-rolled 
Cold-rolled 
Cold-roUed 
longitudinal. 
transversal. 
longitudinal. 
transversal. 
Ho. 
Diff. 
Ho. 
Diff. 
Ho. 
Diff. 
Ho. 
Diff. 
readings. 
readings. 
readings. 
readings. 
O / 
— i 20 
- 4 50 
+ 0 10 
1 
+ 1 0 
7 
13 
19 
2 
— 1 50 
8 
— 2 30 
14 
— 1 30 
20 
— 1 55 
3 
— 1 5 
9 
— 2 20 
15 
- 7 10 
21 
+ 3 5 
4 
— 4 5 
10 
— 2 40 
16 
— 6 20 
22 
— 0 35 
5 
- 1 30 
11 
— 1 50 
17 
— 3 30 
23 
— 6 10 
6 
— 3 20 
12 
- 2 40 
18 
— 4 25 
24 
— 3 25 
Sura... 
— 10 50 
Sum... 
— 13 20 
Sum... 
-27 45 
1 Sum... 
1 
-8 50 
Total sum . . . —60° 45'. 
It would appear that, after a certain diminution, the shocks on the equatorial plane 
have no tendency to reduce the magnetism further. 
The bars were placed on the wood of the dip plane, with lettered end upwards. 
Experiment 13, February 21, O'*. 
The bars upon the boards of the dip plane, with lettered end upwards, were fairly 
struck each three times with the mallet. 
Hot-rolled 
longitudinal. 
Hot-roUed 
transversal. 
Cold-rolled 
longitudinal. 
Cold-rolled 
transversal. 
Ho. 
Diff. 
Ho. 
Diff. 
Ho. 
Diff. 
Ho. 
Diff. 
readings. 
readings. 
readings. 
readings. 
O / 
O / 
O 
/ 
1 
— 18 20 
7 
13 
— 19 25 
19 
— 15 
5 
2 
— 15 30 
8 
-14 20 
14 
- 19 10 
20 
— 20 
5 
3 
— 17 50 
9 
— 15 40 
15 
— 23 40 
21 
— 10 
25 
4 
-17 55 
10 
16 
— 24 20 
22 
— 14 
0 
5 
— 15 50 
11 
— 14 0 
17 
— 19 55 
23 
— 20 
5 
6 
— 14 25 
12 
-14 10 
18 
— 20 0 
24 
- 21 
20 
Sum... 
-99 50 
Sum... 
-87 15 
Sum... 
— 126 30 
Sum... 
— 101 
0 
Total sum . . . — 414° 35'. 
The readings for bars 7 and 10 appeared suspicious, and have been omitted, the 
“sum” for the second series being formed by multiplying the sum for bars 8, 9, 11, 
12 by f. It scarcely differs from that which would have been given by the use of the 
recorded numbers. 
The bars were returned to the wood of the dip plane, with lettered end downwards. 
MDCCCLXII. 2 Q 
