Science Source ftp Apr 2015
EN_01170126_1241
![Science Source ftp Apr 2015](img/medium/arch20/dvd0060/09/EN_01170126_1241.jpg)
The Trench Signaling lamp was in a wooden case and was battery operated. It had a bulls eye lens to concentrate the light and had a morse key to switch the lamp on and off. It was used mainly for local use from trench to trench and operators would receive the message through a periscope or telescope. It was always extremely dangerous to transmit towards the front of the battlefield as this would attract enemy rifle fire. No date or location available.
2015-04-07
East News
Science Source
Photo Researchers
BZ7866
1,69MB
33cm x 23cm przy 300dpi
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