OF HOT-EOLLED AJN'D COLD-EOLLED MALLEABLE lEON. 
285 
The bars were returned to the dip plane, lettered end upwards. On March 27, 1'', 
they were moved to the equatorial plane, lettered end upwards. 
Experiment 21, March 31, 1'*. 
The bars had been resting undisturbed on the equatorial plane since March 27. 
Hot-rolled 
longitudinal. 
Hot-rolled 
transversal. 
Cold-rolled 
longitudinal. 
Cold-rolled 
transversal. 
No. 
Diff. 
readings. 
No. 
Diff. 
readings. 
No. 
Diff. 
readings. 
No. 
Diff. 
readings. 
1 
+ 12 40 
7 
+ 12 25 
13 
+ 16 5 
19 
+ 23 35 
2 
+ 13 40 
8 
+ 15 10 
14 
+ 21 30 
20 
+ 19 30 
3 
+ 12 55 
9 
+ 16 15 
15 
+ 17 40 
21 
+ 21 40 
4 
+ 15 5 
10 
+ 14 15 
16 
+ 19 0 
22 
+ 22 50 
5 
+ 15 55 
11 
+ 15 35 
17 
+ 22 30 
23 
+ 22 10 
6 
+ 15 50 
12 
+ 15 5 
18 
+ 24 35 
24 
+ 32 5 
Sum... 
+ 86 5 
Sum... 
+ 88 45 
Sum... 
+ 121 20 
Sum... 
+ 141 50 
Total sum . . . +438° O'. 
The bar No. 20 does not appear to have undergone any further change in its mag- 
netism. 
After this, the apparatus was dismounted, and the bars were packed up in the same 
order as at first. 
I shall now proceed to exhibit the principal results deducible from the details above. 
For abbreviation, I shall sometimes use the expression “tendency 0” to denote that 
the operation on the bars has been performed while they were lying on the equatorial 
plane ; “ tendency + ” to denote that the bars were lying on the dip plane, with lettered 
end downwards; “tendency — ” to denote that they were on the dip plane with lettered 
end upwards. 
I. Aggregate of magnetism in the twenty-four bars. 
Exp. 1. After standing several days, tendency — 
2. After resting one day, tendency 0 
3. Struck heavily, on flagstones, large iron hammer, tendency 0 . 
4. Struck heavily, tendency — ; examined after a day’s rest, with 
tendency — 
6. (Immediately after Exp. 4), struck heavily, tendency — , . . . 
6. Not struck, but under + tendency for three days . . . . . 
7. (Immediately), struck lightly with light iron hammer, tendency + 
8. After resting quietly one day, under + tendency 
9. (Immediately), struck fairly with light iron hammer, tendency + 
10. After three days’ rest, tendency 0 
11. (Immediately), struck fairly with light iron hammer, tendency 0 
+25l 40 
+227 10 
- 28 35 
-541 45 
-520 57 
-413 20 
+293 35 
+272 15 
+ 340 45 
+257 25 
- 33 40 
