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SONAR TERMS #2

Across
Turning the projector or hydrophone so that it goes through the entire arc of the target's propeller sounds.
Bearing of the maximum loudness in sweeping across the target. Also called "Maximum bearing."
The development of an electric current when a Rochelle salt crystal changes in size.
Decrease in temperature of water with depth.
Frequency above 15,000 cycles per second
The distance from a given point on one compression to the corresponding point of the next compression of a sound wave.
The tendency of sound waves to bend around an obstacle in their path and meet somewhere beyond.
A complete sound wave compression-plus-rarefaction.
The Torpedo Data Computer-a device which figures out the correct firing data, using the facts of bearings, ranges, course, and speed.
Another-term for sonic frequency; that is, below 15,000 cycles per second.
Frequencies less than 15,000 cycles per second.
Down
An electrical device used to send a burst of supersonic sound (ping) into the water by means of the projector.
The rate in knots at which a target's range is changing. Useful in determining the speed of the target.
Increase in temperature of water with depth.
The ribbon of churned-up water astern of a moving ship or submarine. It consists of small currents, eddies and entrapped air bubbles.
A bearing obtained by computing the middle point between where the signal comes in and where it goes out in sweeping across the target.
Water in which the temperature does not change with depth.
Noise that tends to mask the sounds you want to hear. Chiefly water noise and noise from the receiver itself.
The frequency obtained by mixing two different frequencies.