34 
VI 
CURVE 
TYPICAL 
CURVE 
ry) 
Figure Al. Anderson's compensation method 
ie (R = 6))) 
Ss Se A 
a a (Le CS) 
Now the effect of the resistance ) is to translate the 
curve 7 (7) to the right, while the effect of resistancea@ is to ro- 
tate 7 (7) clockwise and to displace it a little to the left although 
a slight distortion also occurs (figure A2). Note in figure Al that 
the amount of rotation required to fit Anderson's compensated therm- 
istor curve is considerable compared to the amount of rotation in 
figure A2 required to make the most divergent 7 (7) curves parallel. 
In other words, a simple translation alone can nearly cause coin- 
cidence. Only a slight rotation is then necessary. Two advantages 
result: (a) there is a minimum distortion of the curves, and (b) 
the (negative) rate of change of resistance with temperature (a 
measure of sensitivity) is greater. 
