speaking tube


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speaking tube

A tube, usually of metal, used to transmit the voice from one part of a building to another, before the days of electronics.
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References in periodicals archive ?
The strategy she adopts is to speak through the male, as though into a speaking tube.
The inside had been preserved to give a flavour of how it looked during the last war, complete with speaking tubes between floors which kept the girls entertained for way too long.
The standard now recognizes equipment such as free-standing activity panels or speaking tubes, musical or percussion toys, etc.