ELECTRO DYNAMIC QUALITIES OF METALS. 
fil 
approximation to the value of the vertical component of the earth’s magnetic force 
at Glasgow. The true value, as said above (Part VI., § 183), is nearly ‘43. (Compare 
also § 243 below.) 
208. Immediately after the results given in Table I. were obtained, the experiments 
were repeated with the water in the cistern B kept constantly at the temperature of 
100° C. Thus the water flowing through the channel between the coils may be 
considered as having been nearly at the boiling point. The results are given in 
Table II. 
Table II.—Temperature 100° C. 
Results for + M. 
Operations. 
Deflections. 
on 
+ 26 
off 
-26 
on 
+ 33 
off 
-33 
on 
+ 28-5 
off 
-28-5 
on 
+ 19 
off 
-19 
on 
+ 11 
off 
-11 
on 
+ 6 
off 
- 6 
on 
0 
off 
0 
on 
- 6 
off 
+ 6 
on 
- 8 
off 
+ 8 
on 
+ 9 
off 
- 9 
Current 
strengths. 
0 
27 
75 
127 
185 
220 
274 
357 
453 
830 
Results for — M. 
Operations. 
14 on 
„ off 
„ on 
„ off 
„ on 
„ off 
,, on 
„ off 
,, on 
„ off 
., on 
„ off 
„ on 
„ off 
„ on 
„ off 
„ on 
„ off 
„ on 
„ off 
,, on 
„ off 
„ on 
„ off 
,, on 
„ off 
„ on 
„ off 
Deflections. 
0 
0 
-31 
+ 31 
-32-5 
+ 32-5 
-31 
+ 31 
-26-5 
+ 26-5 
-22 
+ 22 
-13 
+ 13 
- 5 
5 
075 
0‘75 
3 
3 
6 
6 
7 
7 
7-5 
7‘5 
9 
9 
J 
Current 
strengths. 
11 
34 
56 
86 
109 
138 
186 
242 
283 
340 
406 
478 
508 
830 
209. For convenience of comparison, the results given in the above tables are repre¬ 
sented graphically by the accompanying curves (Diagrams II. and III.), in which the 
abscissas represent magnetizing forces, and the ordinates augmentations and diminu¬ 
tions of the magnetism of the wire. In Diagram II., a separate curve is given for -f-M 
and — M, at both temperatures; the curves for the higher temperature being drawn in 
full lines, and those for the lower temperature in dotted lines. In their general features 
they are similar to the curves given in the preliminary notice above referred to ; but 
they include a more exact determination of the amount of the magnetizing force which 
