Pneumatic postal service, 1880s

Pneumatic postal service, 1880s

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Credit: BILDAGENTUR-ONLINE/TH FOTO/SCIENCE PHOTO LIBRARY

Caption: Pneumatic postal service. 19th-century artwork of post being delivered through a pneumatic delivery system in Berlin, Germany. The tubes seen here are the start and end of a network along which messages are propelled by air differentials. This air differential is created using air compressors and a system of valves (operated using the controls seen here). Speeds of around 40 kilometres an hour were possible. Pneumatic systems were first built to transmit telegraph messages to stock exchanges (London, 1853), and a pneumatic system operated in Paris from 1866. This engraving dates from 1888.

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