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| U.S.N.B.D. - BRITISH LAND MINES AND FIRING DEVICES |
| FIRING DEVICES |
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DIAMETER |
Body: 1/2 in. |
BRITISH SWITCH |
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Top Plate: 1-1/2 in. |
NO. 8 A/P |
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LENGTH |
5-3/4 in. | |
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TOTAL WEIGHT |
4 oz. | |
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MATERIAL |
Steel | |
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PRESSURE REQUIRED |
Approx. 10 lbs. |
Mk I |
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COLOR |
Black, olive drab, or un- | |
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painted steel. |
(SERVICE) |
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EXPLOSIVE |
.303 cartridge | |
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USE: |
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This self-contained unit, which discharges a bullet, is sunk into roads and pathways. Fired by pressure, the bullet will perforate a man's foot or severly damage a pneumatic tire. |
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DESCRIPTION: |
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This switch consists of a hollow metal spike, flanged at the open end, which can be pressed into the ground or hammered with care into a road. Inside the spike is placed the firing assembly, consisting of a metal spindle, flanged at the base and with an um-brella catch located near the top. A spring and spring retaining sleeve are threaded over the spindle and held compressed by the umbrella catch. Over the top of the spind-le is placed a striker with a hollow shaft, and on top of this is placed a rimless .303 cartridge, with a bullet which just protrudes out of the spike. |
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FUNCTIONING: |
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Slgiht pressure on the top of the bullet forces the hollow shaft of the striker over the umbrella catch, releasing the sleeve which holds the spring in compression. The spring drives the sleeve upwards against the striker head, forcing the striker into the base of the cartridge and firing the cartridge. |
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INSTALLING & ARMING: |
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This assembly usually is issued cocked ready for use, being held in position in the spike by a cork. If it is necessary to cock the switch, first push the empty barrel into the ground to the level of flange. Place the spring retaining sleeve, rounded end down, over spring, and push down until the catch engages over the top of the sleeve. Place the cocked mechanism in the barrel of the switch, and lower the striker into the barrel. At arm's length, lower the cartridge gently into the barrel point upward. Hold the cart-ridge between the fingers; then in case of a premature firing a finger will not be blown off. |
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DISARMING: |
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Carefully remove the cartridge from the pistol, at arm's length, and between the fin-gers. |
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REMARKS: |
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1. Test this switch by cocking the mechanism and inserting the striker. Depressing the striker with the blunt end of a pencil will compress the catch and release the spring retaining sleeve. The impact can be felt in the pencil. Never use the cartridge for test-ing. |
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2. Never place the cartridge in the spike except when laid. |
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