Transcriber's note:
Every effort has been made to replicate this text as faithfully as possible. Some changes have been made. They are listed below.
The format used for fractions in the original, where 1 1-4 represents 1¼, has been changed to the latter.
In the chapter "How to Make an Induction Coil," a section heading "PART I." was removed as there is no "PART II."
The following is a list of changes made to the original. The first line is the original line, the second the corrected one.
Page 11:
It this can be done over night,
If this can be done over night,
and the coil left to get cold as the the fire goes out,
and the coil left to get cold as the fire goes out,
Page 12:
so as to leave about ¼ of an inch of the core projectiug from it,
so as to leave about ¼ of an inch of the core projecting from it,