COMPARISON OF ONE COIL WITH ANOTHER 53 
secondary has 800 turns per centimeter; it was selected 
as a basis of comparison merely for convenience. 
In Table IV, columns 5 and 6, are given, for the differ- 
ent inductoria examined, the values of L AW and 
AW 2 
L = To simplify the comparisons between the 
AW 2 
various coils the values of - as given in Table IV 
were all divided by 800, the number of turns per centi- 
meter in the secondary of coil B, thus making the value of 
L for coil B the same by either formula. These values 
are set down in column 7 of the table. To bring the 
final results into convenient denominations these figures 
and also those in column 5 were divided by 100. It is 
understood, of course, that these divisions, made purely 
for convenience, in no wise modify the relations between 
the coils. 
In Table V are set down the experimental results of 
the comparisons between the various inductoria. Since 
details would only confuse, they are omitted. The fig- 
ures presented in the table show clearly that the proper 
AW 2 
expression for L is AW rather than 
