At the same time, the computer was operating silently, searching for the pulse-burst and scrambler timing of the telecom transmission.

Kyle kept watching Democritus, which, of course, was operating absolutely silently.

The system would operate silently, she said, "in a way that an assailant would not know was happening."

Only the pickup cameras of the closed video system were present but they operated silently.

That's why the New Jacobins operate silently, efficiently, without publicity.

The machine operates smoothly and almost silently, a big plus in any home fitness product.

Finally, the electric motors, which operated almost silently, were lowered from the junk and fixed in place on the bouncing rafts.

These hold great promise, because the trucks could use electric power to operate silently in stealth mode.

The YO-3A operated silently at 1,000 feet, or lower, depending on terrestrial background noise.

The sculptor's work, he says, operates silently.