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| U.S.N.B.D. - BRITISH LAND MINES AND FIRING DEVICES |
| FIRING DEVICES |
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WIDTH |
BRITISH SWITCH |
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HEIGHT |
2 in. (w/o fuse adapter) |
NO. 3
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LENGTH |
5/8 in. | |
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WEIGHT |
3 in. | |
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MATERIAL |
4-3/4 oz. | |
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MIN. SAFE LOAD |
Sheet steel |
Mk I |
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COLOR |
1-1/2 lbs. | |
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Olive drab. |
(SERVICE) |
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USE: |
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This switch may be placed under crates, packages, books, or other suitable objects in booby traps installations where initiation by release of pressure is desired. Though rarely used as such, this switch may be employed to initiate demolition charges. |
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DESCRIPTION: |
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The body of the switch consists of a shallow channel section with open ends and a hinged cover provided with an inclined tongue. Into one side of the body is cliped the fuse adapter, complete with percussion cap, by means of a metal leaf. A two-leaf steel spring is attached at one end to the same upright side as the fuse adapter. A striker is fixed to the other end of the spring. A brass block, with a hole bored in its center, is fixed to the bottom of the switch body. A safety pin hole is drilled in the side of the switch body opposite that to which the striker spring and fuse adapter are attached. |
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FUNCTIONING: |
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When pressure is removed from the hinged lid-of the switch, the pressure of the spring on the inclined tongue forces the lid upwards. The spring and the striker are then released, and the striker is driven into the percussion cap. |
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INSTALLING & ARMING: |
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Bend the leaf spring back until the hole in the striker comes opposite the safety pin hole in the switch body. Insert safety pin through switch body, striker, and brass block. Insert the fuse adapter in the hole in the side of the switch body. Close the lid. Place the switch under concealing object so that the lid is held tightly closed. Connect the fuse adapter to the charge with safety fuse. Withdraw the safety pin. If sufficient weight has been placed on the lid of the switch, the safety pin will come away easily. On no account should the pin be withdrawn from the switch with the charge connect-ed, if the pin is at all tight. |
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DISARMING: |
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If the device is accessible, insert a safety pin in the safety pin hole, cut safety fuse, and remove the device and the charge. If the device is inaccessible, cutting the safety fuse between the switch and the charge will have to suffice. |
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REMARKS: |
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1. Test this device for re-use by cocking the switch and slowly releasing pressure on the lid. After testing, recock. The striker may require readjustment following test firing. |
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