Telegraphy

Replica of Claude Chappe's optical telegraph on the Litermont near Nalbach, Germany

Construction schematic of a Prussian optical telegraph (or semaphore) tower, C. 1835

Pavel Schilling, an early pioneer of electrical telegraphy

Telegraphy (from Greek: τῆλε têle, "at a distance" and γράφειν gráphein, "to write") is the long-distance transmission of textual or symbolic (as opposed to verbal or audio) messages without the physical exchange of an object bearing the message. Thus semaphore is a method of telegraphy, whereas pigeon post is not.

单词	Telegraphic signal
释义	Telegraphic signal 英语百科 Telegraphy Telegraphy (from Greek: τῆλε têle, "at a distance" and γράφειν gráphein, "to write") is the long-distance transmission of textual or symbolic (as opposed to verbal or audio) messages without the physical exchange of an object bearing the message. Thus semaphore is a method of telegraphy, whereas pigeon post is not.
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Telegraphic signal

Telegraphy