KNOBBED SAFETY COVER

PLAIN SAFETY COVER

12. Recently manufactured Mk. 6 pistols have nine possible settings of the index poin-ters, indicated by the figures 30, 50, 75, 100, 150, 200, 250, and 300 and the word SAFE stamped on the pistol flanges. The figures indicate the depths, in feet, beneath the surface at which a pistol will fire when the pointer is adjacent to any given setting. When a pistol is set at SAFE, it cannot fire if it has been properly assembled and calibra-ted.

13. At the charge sinks, water enters the pistol inlet vale at one end and the booster extender opening at the other.

14. At a depth of 12 to 15 feet, hydrostatic pressure causes the booster extender to move the booster forward so that the detonator is housed in the booster can envelope. This action arms the depth charge which is now ready for firing.

15. A SAFTE SETTING LOCK prevents the shock of gunfire, bomb hits, or underwater ex-plosions from moving the index pointer off the SAFE setting. This lock consists of a short piece of No. 19 (".0358 dia.) copper wire rove through holes in lug of the index pointer and wrench stop. The ends of the wire are twisted together. The index pointer is there-by secured in the SAFE position and cannot be moved until the wire is broken. Round nose pliers, furnished in service tools sets, are used to install the wire. It is not neces-sary to remove the locking wire to change the index pointer from SAFE to a partiuclar depth setting. The wire will broken by the application of force the depth setting wrench handle. Whenever index pointer is reset to SAFE a new piece of wire is required. Wire, wound on a spool for convenient use, is included in service tool set. Modification of pis-tols in service and in store is covered by Ordalt No. 1735

16. The depth at which the pistol fires is controlled by the setting of a pointer on the pistol. (Mark 6 pistol, 30 to 300 feet; Mark 6 Mod. 1 pistol, 30 to 600 feet.)

LAUNCHING THE CHARGES