42 DR. A. D. WALLER ON THE 
This rule has been observed throughout the series of to-day's 
readings. 
In the first series I have taken readings every half-minute and 
every minute after excitation of five different strengths, omitting 
in each case the very first deflection, and beginning at the first 
half-minute after excitation. 
The series of observations has lasted 13 hour, without appre- 
ciable “ fatigue ” or alteration of resistance. 
The dotted curve gives a second blaze by 1000 at end of 
series. 
Fig. 4.— Relation between strength of Stimulation and magnitude of Blaze. 
. Volt. 
V 9.02 4 peer TT Ort Bow err cn cmos cence te ee een e 
D E 
S F 
Soo, ^ 
a ‘ 
1 L i L L ] 
1000 2000 3000 4000 5000 10000 
Stimulation. 
Fig. 5.- -Ditto, ditto. 
Volb. ce æ- . < t=- -- --2--- - -- -- 7579 
a 0-0247 r 
wq) r 
c | 
a f 
good | 
œ ] 
L L L L L J 
1000 2000 3000 4000 5000 10,000 
Stimulation. 
In the above two series (figs. 4 & 5) the readings taken are 
those of the galvanometer-swing produced when the blaze is let 
through by means of the key R, immediately after passage of the 
exciting current. The effects are homodrome, 7. e. in the same 
direction as the exciting current; and the range from minimal 
to maximal is not a very extensive one—from, e. g., 600 to 2000 
units of a Berne inductorium fed by two Leclanché cells. 
