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WWII SOE TIME PENCILS
Time pencils were fuzes timed by acid corroding a thin wire , when the wire broke a spring forced a pin onto a percussion cap exploding a small charge.
Timing could be erratic in different temperatures, a colour code denoted the time period of each fuze.
Used mainly by resistance movements in various Countries.
The items shown are colour time code Green.
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- The time pencils were always used in pairs as the reliability of the fuze was a bit erratic. Issued to the British Underground Resistance known as the Auxiliary Units.
The time pencils operated differently in summer to winter. Times were longer in cold weather
Red 1/2 hour summer 3/4 hour winter
White 11/2 hours summer 21/2 hours winter
Green 5 hours summer 6 hours winter
Yellow 10 hours summer 18 hours winter
Blue 20 hours summer 30 hours winter
Black 10 mins only used for training
.......... STEPHEN LEWINS, MORPETH, 8th of November 2014