Military Mk V Heliograph Signalling Mirror in Original Tin (81013)

£65.00

4 in stock

SKU: 81013 Categories: , Tags: , ,

Description

Military Mk V Heliograph Signalling Mirror in Original Tin.

The heliograph is a wireless telegraph that signals by flashes of sunlight reflected by a mirror. the flashes are produced by momentarily pivoting the mirror or by interrupting the light beam with a shutter.  The mirror flashes can be seen up to 20 miles away.

Contained in the tin are two mirrors.

Signalling was key to a successful military operation.  Early methods of signalling included flags, lamps and heliographs.

A small but important item of military history.

Size 14cm diameter.  1.5cm high.

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