![](http://www.alamy.com/thumbs/6/617EEF42-3351-4BF4-AD5A-F77F6CBD8D3A/2ACKTWH.jpg)
Crataegus x lavallei \Carrieri\"."
Size: 3744px × 5616px
Photo credit: © GEOFF KIDD/SCIENCE PHOTO LIBRARY / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., 1800s, 1833, 19th, 8, aerographe, artwork, black--white, cadran, century, circle, circular, code, codes, communication, communications, de, decoder, delatour, device, diagram, dial, encoded, encoder, encoding, europe, european, france, french, historical, history, illustration, indicateur, invention, machine, mechanical, mechanical-optical, monochrome, optical, pessault, planche, semaphore, signal, signals, systeme, table, technological, technology, telegraph, telegraphy, universel