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A crystal microphone that responds to waterborne sound waves.

Related Terms

ACOUSTIC

A term pertaining to sound, or the science of sound.

AMBIENT NOISE

The normal sound in a room or other location.

AIRBORNE SOUND

Sound which reaches the point of interest by radiation through the air.

HYDRAULIC CURRENT

A current in a channel caused by a difference in the surface level at the two ends. Such a current may be expected in a strait connecting two bodies of water in which the tides differ in time or range. The current in the East River, N.Y., connecting Long Island Sound and New York Harbor, is an example.

ICE PELLETS

A type of precipitation consisting of transparent or translucent pellets of ice, 5 millimeters or less in diameter. The pellets may be spherical, irregular, or (rarely) conical in shape. They usually bounce when hitting hard ground, and make a sound upon impact. Ice pellets includes two basically different types of precipitation, those which are known in the United States as SLEET and SMALL HAIL. Sleet is generally transparent, globular, solid grains of ice which have formed from the freezing of raindrops or the refreezing o

FATHOMETER

A depth finder that uses sound waves to determine the depth of water.

INOPERATIVE

Said of a sound signal or radionavigation aid out of service due to a malfunction

BELL

The type of buoy with a large bell and hanging hammers that sound by wave action.

HORN

A sound signal which uses electricity or compressed air to vibrate a disc diaphragm.

NOISE

Any undesired sounds, usually of different frequencies, resulting in an objectionable or irritating sensation.
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