Domestic Use
In domestic applications, voicepipes were smaller and referred to as "speaking tubes". The ends of the tube were often flexible for convenience of use. The speaking tube supplemented the array of remotely controlled hand bells that were operated in the upstairs rooms and rang in the servant's quarters in even modest houses in the 19th century. The phrase "get on the horn" and "give him a blow" as well as the use of "blower" as a synonym for "telephone" are generally accepted as having their origin in this feature of speaking tubes.
Speaking tubes were employed in some offices, with whistles at either end and were therefore also known as whistling tubes. Several speaking tubes could be hung from the edge of a desk to communicate with different locations.
Speaking tubes were also used in fine automobiles, allowing communication between the separate passenger and driver's compartments when desired.
Read more about this topic: Speaking Tube
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