I have recently been metal detecting on a old post & pre World War II railway dump and along with some old bottles and other metal finds I have come across 20+ of these little things all in separate locations.
So far I only know that there is a stick going through most of the full ones and the outside stuff on the inside comes off like a black chalk but on most it does not because it is covered in something still.
I would appreciate any ideas of what these are.
My grandfather put forward the suggestion of the old radio fuses but I just wanted all your combined knowledge.
Appreciated in advance...
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