64 GENERAL PROPERTIES OF LIVING TISSUES 



diminishes, the increment of increase in the in- 

 tensity of the induced current is not the same 

 but greater for each centimetre of approach. 



Graduation. Fasten a strip of white gummed 

 paper at the side of the base of the inductorium, 

 beginning at the end block which holds the 

 primary coil. Place the secondary coil at the 

 end of the slideway. Make the primary current. 

 Head the number of degrees of deviation for the 

 break induction current only. Make a line on 

 the paper band exactly opposite that end of the 

 secondary coil which is nearer the primary. 

 When the needle is again at rest, move the 

 secondary nearer the primary coil, and find the 

 distance at which the deviation of the needle in 

 response to the break induction current is n de- 

 grees (for example, two) of the scale larger than at 

 the former position of the coil. Mark on the white 

 strip the new position of the coil. Continue in 

 this way to find the positions of the secondary 

 coil at which the needle shows successively a 

 deviation two degrees greater at each new posi- 

 tion, and mark them on the paper band. 



The marks on this empirical scale will be 

 nearer together as the secondary approaches the 

 primary coil. 1 



1 The rough method here employed serves merely to show 

 that the increase in the intensity of the induction current as 



