700 
SIE WILLIAM THOMSON ON THE 
188. Each series from I. to XXIX. was conducted with perfect regularity on one or 
other of several plans, of which the details are sufficiently exemplified in the preceding 
unabridged quotations. Omitting now the actual readings and taking merely the 
differences from the zeros, we have the following full statement of results showing the 
amount of the electromagnetic impulse produced by each operation. 
[Addition, May 1876. — It must not be assumed that the apparent accumulations of 
magnetization shown in the last columns of the Tables I IX., or that the differences 
of demagnetizations and magnetizations shown at the foot of each of the Tables down to 
XVII., express correctly the whole changes of magnetization of the wire ; for, as remarked 
above (§ 178), the ballistic method does not show slow changes of magnetization; and 
there certainly were slow changes of magnetization not shown in my ballistic experi- 
ments ; because the algebraic sum of all the deflections observed day after day went on 
sometimes continually increasing and sometimes continually diminishing, when it was 
certain that there was no corresponding progressive accumulation of magnetization or 
of demagnetization. Some of the experiments by the method of deflection promised in 
§178 were performed in last July and August, soon after the communication of this 
paper, and gave very remarkable results, which were free from the objection of dropping 
out of account slow changes of magnetization. They include effects of torsion as well 
as of pull. I intend to include a statement of them in a paper which I hope soon to 
be able to offer to the Royal Society.] 
Series I. to IX. — Magnetizing Current made and broken. 
November 26, 1875. — I. Weights off. 
Magnetization 
by 
Make. 
Decrease 
of 
Magnetization 
by 
Break. 
Excess of 
Magnetization by 
Make above 
Demagnetization 
by Break. 
Apparent 
accumulation 
of 
Magnetization. 
26 
23 
3 
3 
24 
21 
3 
6 
25 
23 
2 
8 
24 
21 
3 
11 
24 
21 
3 
14 
23 
21 
2 
16 
24 
22 
2 
18 
24 
21 
3 
21 
24 
21 
3 
24 
23 
09 
1 
25 
