BLAZE-CURRENTS OF YEGETABLE TISSUES. 35 
Compensator. 
-units e$ téns 
M o == ? 
© Le 1/94 
EC 
TM 
| 
Il 
iul i ij UU 
> Keyboard. 
The plant is placed between the Electrodes, A, B. Excitation is delivered to it 
from the Sec. Coil via the Keyboard; the direction of excitation is deter- 
mined by the Reverser R, in the primary circuit, The Key S'T in that 
circuit serves to deliver single or tetanising currents. The Compensator 
serves to counterbalance any incidental plant-current and to standardise 
the deflection ; the direction of its current is determined by the Reverser R,. 
The Galvanometer, by the movements of a spot of light on the transparent 
scale, indicates the direction of exciting current or currents, and the 
direction and magnitude of the responsive or blaze-currents. 
D 2 
