52 INDUCTION SHOCKS 
W 
having the same value of > namely the same number 
of turns per centimeter, the expression L = AW might 
AW 2 
be substituted for the expression L = and equal 
values of - for equal stimuli would be given. The 
j^ 
next step was to see whether those inductoria which for- 
merly gave non-concordant results would give concordant 
ones if for the value of L the expression AW, namely the 
product of the cross section of the secondary by the num- 
ber of turns in it, were used. It was found that when this 
was done all the inductoria examined gave for equal stim- 
uli corresponding values of - ' regardless of the dimen- 
Li 
sions of the coils, but subject to a certain restriction as 
to secondary resistance to be discussed later (p. 78). 
In order to bring this point out clearly some of the ex- 
periments upon which it is based are cited below (Table 
V). The inductoria used are described in Table IV. 
In this table only those inductoria are considered whose 
secondaries have different numbers of turns per centi- 
meter, since only by them can be determined which of 
the two expressions for L is correct. In all the experi- 
ments, comparisons were made between the various in- 
ductoria and a single one known as coil B. This is a 
large inductorium with a Kronecker calibration whose 
