A signal lamp is a visual signaling device for communication, typically using Morse code. Modern signal lamps are focused lamps which can produce a pulse of light. In large versions, this pulse is achieved by opening and closing shutters mounted in front of the lamp, either via a manually operated pressure switch, or, in later versions, automatically |
Gas masks used in WW1 were made as a result of poison gas attacks that took the Allies in the trenches on the Western Front by surprise. Early gas masks were crude as would be expected as no one had thought that poison gas would ever be used in warfare as the mere thought seemed too shocking.
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The First Battle of the Marne was a World War 1 battle fought from September 6th–12th 1914 It resulted in an Allied victory against the German armies in the west. |