|Type 12-Year Instantaneous Nose Fuze - Army|
The Type 12-Year Nose Fuze - U.S. Designation A-2(b) - is an instantaneous impact fuze used on a Japanese Army bomb types in the 50kg class and smaller.|
The fuze body houses the striker and arming spindle. Vanes are screwed on to the the arming spindle which projects above the body.
When dropped, an arming wire is withdrawn and the vanes turn, arming the bomb after six revolutions and the vanes depart.
What remains is a simple impact striker, retained by a creep spring. There is no shear wire. On impact the striker is forced inward, compressing the creep spring and piercing the primer.
| This fuze shows a Tokyo Arsenal mark and is dated November 1939.
Of interest is the transit can - quite an elaborate assembly. Clearly from a time when Japan had abundant resources and time available to devote to something as mundane as a fuze can.