One of the most significant uses was as a signalling device.

Its original use was as a signalling device to ships.

A sound signalling device, such as a whistle, is also required by law.

There is a signalling device here, obviously for some sort of guidance control.

For one thing, neurons turn out to be only signalling devices.

To many employers, university education has become little more than a signalling device, a means to filter out potential staff.

A signalling device is not a substitute for navigation lights.

Their signalling devices were inadequate even to reach Earth.

Please get some more green maple for the signalling device .

It may be that tort reform is most valuable as a signalling device.

The alarm features a circuit board assembly and a sound signalling device.

Take precautions and keep signalling devices within hand’s reach.

During early 1918 a "rapper" signalling device appears to have been installed.

In doing so, the now focused sunlight ignites the signalling device.

It was intended for laying down smoke screens and as a signalling device.

The prince was found after 25 minutes with the help of a signalling device he was carrying.

Is she concealing a radio perhaps, a signalling device?

All boats operating between sunset and sunrise must carry a signalling device.

The captain also communicated with the engine room by means of a mechanical signalling device.

A signalling device which can help children with autism understand the emotional changes of themselves and their interlocutors.

I feel pretty much like it myself-from relief that your signalling device blew out.

The sound of small propellers and an underwater signalling device could be heard for a short while after the explosion.

Be tamper resistant (including external signalling devices and telephone lines).

Bells or other audible signalling devices are required equipment in many jurisdictions.

You can drop the plotter, screwdriver, gown, and signalling device.

Well, if the data is close to real time, then I would think it could serve as an early warning device.

"People have been known to go to sleep at other jobs, and the plant has warning devices if some situation comes up."

What good is a warning device if no one monitors it?

On a planet with no life, it was a simple but effective warning device.

The police officers only turned on their warning devices to get his attention, to try and speak to (him).

He gave man a conscience as a warning device, when a wrong choice was about to be made.

Many people are unfamiliar with the warning devices designed for their safety.

The warning devices which were supposed to work didn't," she began. "

But Federal laws have cut such practices, helping the market for warning devices.

Fire alarm warning devices can also be set to different volume levels.

On our initiative several warning devices have been installed there.

The cause was the driver's apparent failure to see or hear the warning devices.

In the late 19th and early 20th century underwater bells were used as warning devices.

Construction of a simple and inexpensive water temperature warning device.

In the dark even the most skilled of men could overlook some warning device.

This was one of the best warning devices they car- ried.

It could be a warning device to keep those beast boys away from the food," Scott said. "

A 'door open' warning device may be visual or audible.

The operator must have facilities to check the operation of such warning devices at all times.

However, never assume that a warning device is not operating properly.

My empathic sense will certainly be useful as a warning device.

Something had triggered the warning devices at one of the listening posts.

The rebuilt bridge is equipped with high water warning devices.

An active protection system and laser warning devices can also be installed.

He couldn't see the guards or various security warning devices from his present vantage point, but they were out there.