How To Use Speaking tube In A Sentence

• On a shelf set in the bulkhead was a chart, a telephone receiver, speaking tubes, dials with red and black hands, an array of electrometers, pressure gauges. The Cruise of the Dry Dock
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• Mary went to a speaking tube by the lift and, after much rumbling and another clank, a pot of marmalade arrived. CHARMED LIFE
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• The air line noted above was left in place, to be used as a speaking tube so that we could pass signals back and forth during the escape.
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• Mary went to a speaking tube by the lift and, after much rumbling and another clank, a pot of marmalade arrived. CHARMED LIFE
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