vi CONTENTS 
CHAPTER IV. 
PAGE 
THE PHYSICAL PRINCIPLES UNDERLYING THE MEASUREMENT OF 
BREAK SHOCKS 3 2 
The Course of Break Induced Currents 32 
CHAPTER V. 
THE DETERMINATIONS OF MUTUAL INDUCTION BETWEEN PRIMARY 
AND SECONDARY COILS 38 
CHAPTER VI. 
EFFECTS PRODUCED BY AN IRON CORE IN THE PRIMARY COIL .... 43 
CHAPTER VII. 
COMPARISON OF ONE COIL WITH ANOTHER THE VALUE OF ... 50 
CHAPTER VIII. 
THE PREPARATION OF A CALIBRATION SCALE FOR BREAK SHOCKS . . 55 
CHAPTER IX. 
THE MAKE AND BREAK OF THE PRIMARY CIRCUIT 60 
The Knife-blade Key 63 
The Operating Device 65 
The Short-circuiting Device 67 
CHAPTER X. 
THE INFLUENCE OF SECONDARY RESISTANCE AND OF CATHODE 
SURFACE 71 
The Relation of Tissue Resistance to Secondary Resistance as 
a Whole 71 
Determination of Tissue Resistance 72 
Effect upon the Stimulus of Varying the Secondary Resistance 73 
Current Density, an Important Factor 76 
