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Sound′ing-bot′tle.

A vessel employed for drawing up water from considerable depths in the sea, for examination and analysis. It frequently contains a thermometer for ascertaining sub-surface temperatures. See Fig. 5327.

A usual form is of wood, and has upwardly opening valves at top and bottom. It is bent on to the sounding-line above the lead, the water passing freely through during the descent, but being prevented from escaping during the upward movement by the valves, which close by gravity. See Ther-Mometer.

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