Posted by Nigel Graham 2 on 21/07/2023 22:25:05:
Just a guess, Michael, at Q2:
Spring wire for a clock part?
.
Good try, Nigel … I can see the logic
But, no … the wire is relatively soft and and an untarnished silvery colour.
Actually, its purchase has raised some interesting questions in my mind, about uncertainty of measurement; so I will probably start a new thread later today.
MichaelG.