THE SCIENCE MASTERS' BOOK
SERIES II, PART II
BIOLOGY - CHEMISTRY - EXPERIMENTS FOR RECEPTIONS
Being experiments selected from the School Science Review by a committee of the Science Masters' Association
Edited and arranged by G. H. J. ADLAM, O.B.E., M.A., B.Sc.
192. Jacob's Ladder
Two pieces of stout copper wire, about a yard long, are held vertical and nearly parallel by threads attached to a wooden frame. If the wires are about 3 in. apart at the bottom and 4 in. at the top, they serve as sides to the ladder, and when joined to the secondary of a fairly large induction coil, a spark beginning at the bottom will gradually rise up the ladder. The experiment can be made most spectacular if carried out in a dimly-lighted room, and if the wire has a coating of strontium, barium and other salts, so that the "rungs" of the ladder then change on the way up.
Unfortunately, the induction coil building descriptions are in Part I, which I don't possess :(