It was impossible to consult with Earth; he had already been warned that any messages might be tapped - per- haps by relay devices on the bomb itself.

In either design, small relay devices are inconspicuously placed in various rooms, and they respond to a hand-held command unit sending out infrared beams.

In 1954, three years before the Russians orbited the first human-made satellite, Dr. Pierce started thinking about such a platform as a relay device for communications.

On February 8, it was reported that a relay device intended to prevent an electrical overload had caused the failure.

A subsequent report from an independent auditor confirmed the relay device as the cause.

The signal began to fade, and Alyx planted the second of four relay devices she'd brought, reestablishing contact.

Rosenberg instructs Calhoun that he must activate and align a relay device on Xen in order for them to be able to accurately set their destination.

To attain the high reliability achieved by conventional relay devices necessitates costly backup circuits, as well as elaborate RFI protection in the form of filters and screens.

That accident was attributed to the failure of a relay device.

Jared Lebow, a spokesman for the Transit Authority, said that the relay device was new and had been installed only three hours before it malfunctioned.