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	Telegraph station
释义	Telegraph station 原声例句经济学人 Science and technology History offers ample evidence of the consequences: in 1859 a massive solar storm known as the Carrington event started fires at telegraph stations. 历史为其后果提供了充分的证据：1859年，一场被称为卡林顿事件的大规模太阳风暴引发了电报站的火灾。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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Telegraph station

Telegraphy