992 
PROFESSOR J A. EWING AND MISS H. G. KLAASSEN 
Limit of H. 
Limit of B. 
55-8 
16640 
.34-4 
14810 
25-3 
12940 
These, however, are omitted from the figure, as they would have required it to be 
drawn to an inconveniently small scale. 
Inspection of fig. 4 brings out 6ne curious feature in the relation of the successive 
cycles to one another, which, however (as other figures will presently show), is of 
quite general occurrence. The extremity of each cycle lies outside of the rising curve 
of the immediately higher cycle, provided there is no very great difference in their 
ranges of magnetization. It is only when we come down to the lowest cycles, where 
the steps by which B is reduced from cycle to cycle are relatively great, that this does 
not happen. It should be remembered that each of these cycles is taken only after a 
large number of reversals of that particular magnetizing force which determines its 
range. During these reversals the range became somewhat reduced, especially when 
the magnetism does not approach saturation. 
From these curves, by measuring the enclosed areas, values have been found of the 
energy dissipated in performing the magnetic cycle, namely, j"]! dl or, ^ 
HdB. 
Bing I.—Fine Iron Wire. Energy dissipated in Cyclic Process of Double Beversal 
of Magnetism. 
Limit of H. 
Limit of B. 
JII dl, ergs. 
55-8 
16640 
24930 
34-4 
14810 
20320 
25-3 
12940 
17130 
18-23 
10870 
13410 
13-01 
8840 
9900 
8-80 
6780 
6420 
6-59 
5260 
4180 
4-40 
3280 
1940 
2-91 
1410 
450 
1-94 
560 
62 1 
1-23 
270 
18 1 
These results are given graphically in figs. 7 and 8, along with corresponding ones 
for the next rino’. 
Bing II. was of steel wire, of nearly the same fineness as the iron wire of Bing I. 
The diameter was 0'0257 centim., and, like the last, it wms insulated throughout with 
cotton. Eleven cycles were taken in the first instance, as follows :— 
