Heliograph

A heliograph is a solar telegraph system that signals by flashes of sunlight reflected by a mirror. The flashes are produced by momentarily pivoting the mirror, or by interrupting the beam with a shutter.

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Source: Wikipedia · Image: Wikimedia Commons · Public domain

DITDASH

Dit dah — Morse code, signaling, and the basics of getting on the air.

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Every entry, image, and fact is drawn from Wikipedia and Wikimedia Commons, used under public-domain and Creative Commons licenses. No content is AI-generated.