Cassell's Children's Book of Knowledge : Telegraphing Through the Ages

British National Temperance League (2017) Cassell's Children's Book of Knowledge : Telegraphing Through the Ages. [Image]

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Abstract

Smoke
Roman POst A. D. 117
Beacon
Windmills 1767
Edgeworth Method 1770
Disc 1805
Modern Heliograph 1875
Siren
Wireless Telephone
The Telegraph
French Semaphore


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