19th century speaking tube

Bildnummer 11593333
19th century speaking tube
19th century speaking tube. This device consists of two speaking cones connected by an empty pipe through which sound could travel to someone listening at the other end. These devices were found in trains,houses and offices in the 19th century,and had been in use on ships in earlier times as well. This artwork is from a series of illustrated French encyclopedia volumes,published by the Epinal printing firm in the late 19th and early 20th century. The series was called 'Serie encyclopedique des lecons de choses illustrees' (Encyclopedic series of object lessons illustrated),and this example is from a volume published in around 1900
Lizenzart: Lizenzpflichtig
Credit: Science Photo Library / CCI Archives
Bildgröße: 2880 px × 3130 px
Modell-Rechte: nicht erforderlich
Eigentums-Rechte: nicht erforderlich
Restrictions: -

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