At all costs, he kept his band going, playing for dancers and honoring simple but effective musical devices.

But his use of shifting perspectives is an effective device.

It was an ancient and effective device of the conqueror.

Harry saw the door of a small wall safe, protected by a most effective device: a letter lock.

The carport was therefore a cheap and effective device for the protection of a car.

It's an unusual but effective device to learning something about the reclusive 73-year-old tennis icon.

Many of the agency's most effective financial device were contrived in these group brainstorming sessions.

It is also considered the most effective non-hormonal contraceptive device.

It's an effective device that intuitively lets the reader know something significant is happening.

"This is quite an effective disciplinary device on some of our mining colonies."