M75 Modification of Navys Mk

In case of impact action, the firing pin (A), is, on contact with a target, depressed against its spring and strikes the detonator (L), which, in turn, sets off the booster and explosive chge of the shell (Ref 17, pp 162-63 Ref 20a, pp 308-10 and Ref 52, pp 5-100 to 5-102) 

PD M81. It is a superquick and 0.05 sec delay fuze, similar in contour and mechanism (except the booster) to M51 fuzes. 

It was designed for use with the 4.5-inch spin-type rocket because it can arm with the relatively low setback characteristics of a rocket, but it can also be used with 8-inch HE shell (Ref 20a, pp 312 8c 314) 

PD M85. It embodies the same characteristics as described above for the M56 super-sensitive fuze used with 37-mm HE shell, but is modified as to length and weight of the 

A—PLUNGER GUIDE C—SAFETY WIRE ft—POSITIONING PIN. Ae-SHEAR PIN F—PLUNGER G—PERCUSSION PRIMER H—SETSCREW J—WASHER  

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