78 INDUCTION SHOCKS 
The Dependence of Factor A upon Inductorium Con- 
struction. In discussing the method of comparing one 
inductorium with another by the introduction of the 
factor L in the expression Z = > it was stated (p. 52) 
LI 
that this comparison is subject to a certain restriction as 
to secondary resistance. This restriction rests upon an 
observation of Gildemeister,* according to which, if two 
dissimilar inductoria are compared quantitatively by the 
method outlined here, in which the expression for the 
M 
value of a stimulus is Z = X /, it will be found that 
Li 
although equal stimuli may yield corresponding values 
of Z from the two inductoria, with certain secondary 
resistances, when other secondary resistances are used 
equal stimuli will not give corresponding values of Z. 
In earlier paragraphs of this chapter it was pointed 
out that the true or specific value of a stimulus is not 
afforded by the expression Z, but by the expression 0, 
which depends not only upon Z but upon the secondary 
resistance and a constant A as well. The determination 
of A, as previously shown, is according to the formula 
Z R R'-Z R >R 
~ 7 7~ 
R' R 
in which Z R and Z R > are stimuli which, with resistances 
* Gildemeister: Archiv fur die ges. Physiologic, 1910, Bd. 131, 
S. 604. 
