An Unabridged Printing With Text And All Illustrations Digitally Enlarged - A Practical Book On The Construction And Use Of Induction Coils, Containing Full Illustrations For Making A Shocking Coil, A One Half Inch Spark Coil, A Four Inch Spark Coil, And Also Hints On Experiments With Induction Coils. Chapters include: the principles of electrical induction - practical hints on the construction of induction coils - how to make a shocking coil - how to increase the efficiency of sparking coils - particulars of coils for various lengths of spark (with tables) - experiments with the induction coil