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| U.S.N.B.D. - BRITISH LAND MINES AND FIRING DEVICES |
| FIRING DEVICES |
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DIAMETER |
3/8 in. |
BRITISH SWITCH |
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LENGTH |
6 ft. |
NO. 11
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WEIGHT |
5 lbs. (with battery) | |
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MATERIAL |
Rubber tube | |
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COLOR |
Red | |
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Mk I |
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(SERVICE) |
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USE: |
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This switch is employed in a specialized form of trap designed to destroy wheeled or track vehicles. It is laid across a road surface in the probable path of enemy approach. |
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DESCRIPTION: |
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The device consists of two arms, each 2' 9" long, connected together by 6" of double lead flexible wire, and having another double lead of flexible wire provided with plugs to fit into the battery supplied. Each arm contains two brass strips held apart by insulating spacers every 6 inches. The strips are enclosed in red rubber tubing, the ends of which are closed with water-proof rubber plugs. Supplied with each set is a 9-volt dry cell battery, fitted with two sockets to receive the contact strip plugs, and with two screw terminals, to which are attached the leads to the detonator and main charge. |
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FUNCTIONING: |
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The passage of a vehicle over either arm forces the brass strips into contact with each other, completing the electric circuit. The battery sets off the electric detonator, firing the explosive charge. |
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INSTALLING & ARMING: |
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Before connecting the battery to the charge, test the contact strips with an elec-tric blasting cap to make certain that the brass strips are not in contact, that pressure produces the proper contact, and that contact is not maintained after the pressure oea-ses. |
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DISARMING: |
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Disconnect the detonator leads from the battery. |
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REMARKS: |
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1. Because of the red covering of the contact strips, each arm should be painted, sprinkled with earth, or covered with grass, etc., to conceal it. It must not, however, be buried. |
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