Photo Mug : Optical telegraphy, 19th century
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Optical telegraphy, 19th century
Optical telegraphy. Historical artwork of 19th century French soldiers using a telescopic device for optical telegraphy (sending and receiving a message using light). One such early device was the Mangin projector, invented by a colonel Mangin in the early 1880s. Optical telegraphy systems used a telescopic device for observing a distant signal. The range of visibility varied from 20-100 kilometres, depending on the weather and if it was day or night. In the day, reflected sunlight was used to send the signal. The sequences of flashes was read out by the observer and recorded and decoded by the other soldiers. From La Telegraphie Historique (Alexis Belloc, 1888)
Science Photo Library features Science and Medical images including photos and illustrations
Media ID 6431217
© SHEILA TERRY/SCIENCE PHOTO LIBRARY
1888 Apparatus Army Communicating Communication Communications Device France French Humans La Telegraphie Historique Military Observing Officer Officers Optical Projector Recording Signal Signalling Soldier Soldiers Telecommunication Telecommunications Telegraph Telegraphy Telescope Thirties Twenties Visual Watching Writing Belloc Decoding Flashing Telegrapher
Photo Mug
A personalised photo mug blends sentimentality with functionality, making an ideal gift for cherished loved ones, close friends, or valued colleagues. Preview may show both sides of the same mug.
Elevate your coffee or tea experience with our premium white ceramic mug. Its wide, comfortable handle makes drinking easy, and you can rely on it to be both microwave and dishwasher safe. Sold in single units, preview may show both sides of the same mug so you can see how the picture wraps around.
Mug Size is 8cm high x 9.5cm diameter (3.1" x 3.7")
These are individually made so all sizes are approximate
MADE IN THE UK
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* Options may vary by product and licensing agreement. Zoomed Pictures can be adjusted in the Basket.