CONTROL OF LARGE ELECTRIC CURRENT
May 17, 1933
The "ignitron" mercury tube in which a tiny current applied to a pencil lead can control currents in an electric arc a million times greater, is shown with Leon R.Ludwig who with Dr.Joseph Slepian discovered the new control.
These two Westinghouse research engineers expect the "ignitron"
principle to revolutionize present methods of conversion and control
of electrical energy.
PHOTO ## 216628