994 
PROFESSOR J. A-. EWING AND MISS H. G. KLAASSEN 
Cycle (9). 
Cycle (10). 
Cycle (11). 
H. 
B. 
i H. 
B. 
H. 
B. 
476 
1820 
4-08 
1180 
2-24 
360 
2-92 
1610 
! 170 
900 
0-88 
210 
1-50 
1390 
I 0 
610 
0 
70 
0 
1110 
L70 
110 
-1-57 
-210 
--170 
610 
2'99 
- 630 
-2-24 
-360 
-3-40 
- 430 
4-08 
-1180 
-4-08 
-1250 
-476 
-1820 
These results are also shown in fig. 5 (Plate 34), where, however. Cycle 2 and the 
extremity of Cycle 1 are omitted to avoid overloading the diagram. Cycles 10 and 
11 are also omitted. In drawing the curves the points corresponding to the readings 
actually taken are marked by dots enclosed within circles. They give satisfactory 
evidence that the method of observation we have used will yield a smooth curve. The 
curves here have the square-shouldered form, which is often found in steel as well as 
almost always in annealed soft iron. (The absence of this characteristic in Ring I., as 
well as its comparatively low permeability, was an indication of its being in a some¬ 
what hard state.) 
To test more particularly the action of weak magnetic forces, Ring II. was further 
taken through a series of low cycles, the sensibility of the apparatus in regard both 
to ballistic and current measurements having been first increased in the manner 
already indicated. That is to say, an induction coil of a larger number of turns was 
now used, and the current galvanometer was less strongly shunted. Five small cycles 
were observed as follows :— 
