41 
1908-9.] Load and Vibrations upon Magnetism in Nickel. 
and seventh “ ons ” and “ offs ” (fig. I.a) and between the first and seventh 
“ offs ” and “ ons ” (fig. Il.a) for a sufficient number of field values 
between H=+T23 and — 123, i.e. as if the observations had been 
taken on the descending arms of the loops. The induction changes 
(dB) are plotted as ordinates; the number of times the load has been 
put “on” and “off” as abscissae. 
CYCLIC FIELD. A 2 CONDITIONS. 
- 1-23 
Figs. I. and I.a must thus be taken together, as also figs. II. and Il.a. In 
fig. I.a when H=+1'23, for instance, the positive reading obtained with 
the first “ on ” (dash line curve), corresponds with the increase of induction 
at the cyclic extreme of fig. I. for the first “ on.” The ordinate difference 
in the latter fig. between the seventh “on” and the seventh “off” 
corresponds to the readings obtained at the extreme right of fig. I.a 
(H= +1*23), as measured by the distance between the horizontal axis and 
either the “on” curve (dash line) or the “off” curve (full line). Again, in 
