282 ME. G. B. AIEY ON THE DIEEEEENCE IN THE MAGNETIC PEOPEETTES 
Experiment 14, February 21, 1^. 
The bars upon the wood surface of the dip plane, with lettered end downwards, were 
struck each with one light blow of the wooden mallet. 
Hot-rolled 
longitudinal. 
Hot-rolled 
transversal. 
Cold-rolled 
longitudinal. 
Cold-rolled 
transversal. 
No. 
Diff. 
readings. 
No. 
f 
Diff. 
readings. 
No. 
Diff. 
readings. 
No. 
Diff. 
readings. 
1 
+ 85 
7 
+ 
O ! 
7 15 
13 
+ 
1 20 
19 
+ 4 10 
2 
+ 6 50 
8 
+ 
3 35 
14 
+ 
6 55 
20 
— 0 10 
3 
+ 5 20 
9 
+ 
5 10 
15 
+ 
3 45 
21 
+ 6 55 
4 
+ 5 20 
10 
+ 
6 20 
16 
— 
0 50 
22 
— 1 50 
5 
+ 8 20 
11 
+ 
7 55 
17 
+ 
8 50 
23 
+ 0 40 
6 
+ 8 25 
12 
+ 
6 35 
18 
+ 
9 55 
24 
+ 3 15 
Sum... 
+ 42 20 
Sum... 
+ 35 50 
Sum... 
+ 29 55 
Sum... 
+ 13 0 
Total sum . . . -|-121° 5'. 
The bars were placed on the wood of the dip plane, with lettered end upwards, and 
were struck each three times with the wooden mallet, and so left. The mallet was 
raised about a foot for each blow. 
Experiment 15, February 22, O'*. 
The bars were not disturbed before examination. 
Hot-rolled 
Hot-rolled 
Cold-rolled 
Cold-roUed 
longitudinal. 
transversal. 
longitudinal. 
transversal. 
No. 
Diff. 
No. 
Diff. 
No. 
Diff. 
No. 
Diff. 
readings. 
readings. 
readings. 
readings. 
O / 
— 16 40 
o / 
O / 
1 
— 19 10 
7 
13 
— 23 15 
19 
— 18 30 
2 
— 18 50 
8 
— 18 50 
14 
— 24 5 
20 
— 21 10 
3 
— 17 50 
9 
— 18 15 
15 
— 26 55 
21 
— 13 55 
4 
— 18 30 
10 
- 19 35 
16 
— 24 10 
22 
— 17 55 
5 
— 17 35 
11 
— 15 50 
17 
— 22 40 
23 
— 24 45 
6 
— 15 45 
12 
- 18 25 
18 
— 23 35 
24 
— 26 45 
Sum... 
-107 40 
Sum... 
— 107 35 
u m... 
— 144 40 
Sum... 
— 123 0 
Total sum . . . — 482° 65'. 
The bars were placed on the wood of the equatorial plane, lettered end downwards. 
Experiment 16, March 24, O'*. 
The bars had been lying 30 days undisturbed on the equatorial plane. 
Hot-rolled 
Hot-rolled 
Cold-rolled 
I Cold-rolled 
longitudinal. 
transversal. 
longitudinal. 
transversal. 
No. 
Diff. 
No. 
Diff. 
No. 
Diff. 
No. 
Diff. 
readings. 
readings. 
readings. 
readings. 
1 
-iS 50 
7 
O ! 
— 14 50 
13 
— 20 15 
19 
— 15 5 
2 
— 14 10 
8 
— 14 40 
14 
- 19 30 
20 
— 18 55 
3 
— 14 20 
9 
— 12 45 
15 
— 20 50 
21 
— 10 45 
4 
— 14 15 
10 
— 13 30 
16 
— 18 20 
22 
— 13 55 
5 
— 13 40 
11 
-11 50 
17 
— 18 55 
23 
— 21 10 
6 
-12 15 
12 
-13 45 
18 
— 19 20 
24 
- 22 35 
Sum... 
— 85 30 
Sum... 
— 81 20 
Sum... 
-117 30 
Sum... 
— 102 25 
Total sum . . . — 386° 25'. 
