THE MEASUREMENT OF MAKE SHOCKS 
simple equation 
= a-C, 
99 
(S) 
in which C represents a 
constant. Substitut- 
ing in equation (4) the 
value of a given by 20 
equation (5), we have 
(6) 
which is the general 
equation for make in- 
duction shocks. The 
value of C is fixed FIG. 19. Curve obtained by plotting 
for each inductorium. against the different primary voltages 
used in these experiments the values of 
a obtained from curves plotted as in Fig. 
i. The equation for this curve is E X a 
= 36. Abscissas represent values of a; 
ordinates represent primary voltages. 
For the one with 
which this equation 
was developed, coil 
B, its value is 36. 
Comparison of the General Formulae for Break and 
Make Stimuli. If the general equation for break shocks 
be written in the same form as the one for make shocks 
and the two placed side by side, the simple mathematical 
relationship existing between make and break stimuli 
becomes apparent. Written thus, the break shock 
