Sensitive radio-frequency relay

The present paper has been prepared with a view of describing the theoretical properties, mechanical construction, and possible application of a new electron relay, invented and developed by Samuel Ruben, a physicist of New York. This relay has been developed to control currents as great as 5 amperes by means of extremely small operating currents of any frequency, and its use is suggested, therefore, in radio and carrier-current systems, and where similar requirements are to be met.