Chapter 12 - Clocks and Associated Devices - Prevent-Stripping Equipment (P.S.E.) (Geheimhalteeinrichtung)Chapter 12 - Clocks and Associated Devices - Prevent-Stripping Equipment (P.S.E.) (Geheimhalteeinrichtung): TMA P.S.E.
GERMAN UNDERWATERS ORDNANCE MINES
Chapter 12 - CLOCKS AND ASSOCIATED DEVICES
PREVENT-STRIPPING EQUIPMENT (P.S.E.) (GEHEIMHALTEEINRICHTUNG)
LMB P.S.E. (used with Mines Type LMB and Type LMA) (Figure 303)

This device consists of a plunger switch which is held open when the tail door or me-chanism plate to which it is attached is in its normal position, i.e., mine completely as-sembled. If an attempt is made to remove the mechanism plate or tail door, the spring-loaded plunger is released during removal and completes a circuit from the main mine battery through a special P.S.E. detonator, firing a small two-pound charge to destroy the mine unit.

The device is armed prior to launching by inserting a safety pin which closes a break in the P.S.E. circuit. This pin is inserted in the mine case through a plug hole, 135° from the top center line, six inches before the tail door flange. If the P.S.E. is fitted to the case, this hole will be present, although filled and painted over so as not to be obvious.

Figure 303 – LMB P.S.E. Safety Pin Arrangement

Chapter 12 - Clocks and Associated Devices - Prevent-Stripping Equipment (P.S.E.) (Geheimhalteeinrichtung)Chapter 12 - Clocks and Associated Devices - Prevent-Stripping Equipment (P.S.E.) (Geheimhalteeinrichtung): TMA P.S.E.