I found this on a scrap piece of paper at the club last night. Being a bit thick and not knowing what it was for certain I asked a few people and the response was fairly consistent.
‘Its a…errr…y’know…..that you know used to do as kits for err’
Obviously I wasn’t the only one who was a little stuck. Well I don’t know what it is exactly, but I can have a few guesses – I’ll nail my colours to the mast and suggest it is a current meter of sorts. Anyone else care to join in the guesswork with more confidence? It took me long enough to find out what brass treblet tube is!