Now, as though they had been exchanging signals with each other while we talked, they started simultaneously to life.

Two hours later a large steamer exchanged signals with them.

You exchanged signals with him after the fun, so we know it isn't.

The arms of the bay opening up before us as the ship came into it now, exchanging signals with the fortifications, the city beyond.

They must have exchanged signals that not even Adele saw.

Poincaré (1900) analyzed the coordination of moving clocks by exchanging light signals.

Niall sat and watched as the two of them exchanged signals.

As usual I was in touch with Donitz's headquarters and exchanged several signals on short wave.

They could exchange signals for twenty-four hours a day, if they chose, and be working out a code for communication.

Two rather plain-looking young men, loitering in the office-building lobby, had exchanged small signals.