a website collaboration between Science Service and the Smithsonian Institution

1933 - Dr.Joseph Slepian who with Leon R.Ludwig, both Westinghouse research engineers, discovered the new principle - the mercury tube Ignitron

CONTROL OF LARGE ELECTRIC CURRENT

E&MP 43.006

Electrical Engineering

May 17, 1933

The "Ignitron" mercury tube, which is expected to revolutionize present methods of conversion and control of electrical energy, is shown here with Dr.Joseph Slepian who with Leon R.Ludwig, both Westinghouse research engineers, discovered the new principle.

After 25 years of research, they found that an ordinary pencil lead, scarcely ever out of their hands, was capable of controlling by means of a tiny current, electric arc currents one million times greater.

Dr.Slepian is famed as discoverer of the "de-ion" principle of snuffing electric arcs, said to be the only basic improvement in interrupting electric circuits made in the past quarter century.


PHOTO ## 216622


Original Caption by Science Service
© Westinghouse



National Museum of American History

Home

Search - Site Map - Subjects to Choose From - Numbering Format

Credits - Copyright - Comments