Daylight Signal Mirrors
Daylight Signal Mirrors: Daylight signal mirrors are reflective devices used to attract attention in emergency situations. They are made of a reflective surface, such as glass or metal, and are used to reflect sunlight to signal for help.
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IMPA 330271 DAYLIGHT SIGNAL MIRROR HELIOGRAPH
£7.12This signal mirror is designed for use in heliography, a method of communicating using sunlight. The mirror is made of polished metal and is concave so that it can concentrate the sun's rays. The edges of the mirror are beveled to create a sharp image...£7.12