Suspend the entire system vertically with the cigarette tip down. Light tip of cigarette. Switch will close and initiation will occur when the cigarette burns up to and through the string.
A 3 to 5 minute time delay switch can be made from the clotheapin switch (Section VII, No. 1) and a cigarette. The system can be used for initiation of explosive charges, mines, and booby traps.
MATERIAL REQUIRED: Spring type clothespin
Solid or stranded copper wire about 1/16 in. (2 mm) in diameter (field or bell wire is suitable) Fine string, about 6 inches in length Cigarette Knife
1. Strip about 4 inches (10 cm) of insulation from the ends of 2 copper wires. Scrape copper wires with pocket knife until metal is shiny.
To Filing Circuit
2. Wind one scraped wire tightly on one jaw of the clothespin, and the other wire on the other jaw so that the wires will be in contact with each other when the jaws are closed.
3. Measuring from tip of cigarette. Length measure a length of cigarette that will correspond to the desired delay time. Make a hole in cigarette at this point, using wire or pin.
121 Pin or Wire
NOTE: Delay time may be adjusted by varying the burning length of the cigarette. Burning rate in still air is approximately 7 minutes per inch
NOTE: Wires to the firing circuit must not be pulled taut when the switch is mounted. This could prevei* the jaws from closing.
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