speaking tube

noun
a tube for conveying the voice over a somewhat limited distance, as from one part of a building or ship to another.

Origin:
1825–35

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
speaking tube
 
n
a tube or pipe for conveying a person's voice from one room, area, or building to another

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
One such convenience was a speaking tube running from the sergeant's desk to the head of the night driver's bed.
Several lengths of speaking tube, such as you find in apartment houses, were used in the radiator.
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