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For some reason I am thinking of a "Chaff" dispenser for your fuze, not sure why I have that notion as the number N8 is not familiar to me-other than "Experimental" which is backed up by the individual annotation in electro pen.
Lets hope someone comes up with the correct usage for that nice fuze you have.
A current (unrestricted) MOD document still lists the Fuze, Time, Mechanical, Mks 3, 4 and 5 as current. Unfortunatly it doesnt associate them with any particular calibre or type of shell. However as the only current "big gun " in RN service is the 4.5 inch it might be a fair assumption that this is what it was intended for. Does the fuze well diameter and the thread size equate to that found on a 4.5" ?
Perhaps one of the BOCN naval ordnance experts can assit with sizing for the current RN 4.5inch fuze wells?
The evidence tends to go towards 4.5inch but you never know!
Here is a pic of my N8 with an N4?? adapter fitted. Any more ideas on what it fits if not 4.5. Cannot unscrew from adapter but it looks bigger than the 4.5 fuze. Adapter is 98mm diameter.
Thanks for the pictures Sandy-I am even more sure from the pictures that the item attached to your Fuze is from the end of a large Chaff dispensing rocket (5" inch perhaps) it is a pity you cannot take the fuze apart as that would settle this one way or the other as if rocket launched there would be no requirement for a "rotary safety shutter" merely a "setback" safety device.
Good luck with the hunt for further information!
I should add that the attachment your fuze is screwed into does not appear to fit into any Rifled fired ordnance as it is not threaded and being secured by some other means would indicate to me that it is for use with essentially "unspun" ordnance ie a Rocket of some form.
It looks as though the N8 fuze has no HE components being assigned UN0275 HD1.3C on classification.(supported by the brown low explosive filling ring on the photos) there is a Gaine N8 listed that is obviously HE and is classified as UN0408 HD 1.1D.
the plot thickens.
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