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1. (n.) sounder
one that makes a sound.
2. (n.) sounder
one that sounds depth.
Etymology: (1565–75)
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| Definition of 'sounder' |
Princeton's WordNet |
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1. (noun) sounder
a device for making soundings
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| Definition of 'sounder' |
Webster Dictionary |
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1. (noun) sounder
one who, or that which; sounds; specifically, an instrument used in telegraphy in place of a register, the communications being read by sound
2. (noun) sounder
a herd of wild hogs
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| Definition of 'sounder' |
The Standard Electrical Dictionary |
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1. sounder
In telegraphy an instrument consisting of an electromagnet with armature attached to an oscillating bar, the range of whose movements is restricted by adjusting screws. The armature is drawn away from the magnet by a spring. When a current is sent through the magnet the armature is drawn towards the poles and produces a sound as the bar strikes a striking piece or second adjusting screw. When the current ceases the bar and armature are drawn back, striking the first mentioned screw with a distinct sound, the back stroke.
The sounder is used to receive Morse and analogous character messages. The forward strokes correspond to the beginnings of the dots or dashes of the code, the back strokes to beginnings of the intervals. The distinction between dots and dashes is made by observing the interval between forward and back stroke.
Various devices are used to increase the sound. Sometimes a resonance box is used on which the sounder is mounted.
In practice sounders are generally placed on local circuits and are actuated by relays.
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Definitions of sounder 
