LONDON:
E. & F. N. SPON, Ltd., 125 Strand
1901
Entered, according to Act of Congress, in the year 1896
Re-entered for Copyright in 1901
By SPON & CHAMBERLAIN
in the office of the Librarian of Congress, Washington, D. C.
BURR PRINTING HOUSE,
NEW YORK, N. Y., U. S. A.
ERRATA.
Page 55. Should read, "Cords being attached to binding posts Nos. 1 and 2 are in circuit with the Secondary Coil only. When at Nos. 2 and 3 they receive the induced current or extra current in the Primary."
Index. "Tesla coil, descriptive," should read "Tesla coil, disruptive."
PREFACE TO THE SECOND EDITION.
The great favor with which the first edition of this little work has been received and the steadily growing interest in its subject, together with many valuable improvements and researches, may be given as the reasons for this new edition.