Louvre Shutter

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Louvre Shutter
Signal Shutter (folding) (2).jpg
Foldable Signal Shutter
A Louvre Shutter is a visual signalling device used during the Great War. First used about 1916, the shutter had slats after the fashion of a Venetian blind that could be used to send messages in morse. As in the case of the Begbie Lamp, one great drawback of the earlier type of shutter was the noise made when the springs were drawn out to their full extent and released. This was overcome by the employment of a "stop" which prevented the movable leaves of the shutter from completely opening and closing. A further improvement in order to increase portability and decrease the conspicuous character of the first rigid shutters was the invention of a fold-up pattern which could be unrolled for use and fixed to the end of the signaller's rifle, to a fixed bayonet, or to any convenient pole.[1]

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  1. The Signal Service in the European War of 1914 to 1918 – Chapter 8