Slide rules.
I still have one somewhere. Maybe.
My workmate found an old metric imperial converter card in the recycling today - you pulled a card through a sleeve that had windows in it to convert the right quantity from feet to metres and so on.
On the back, it had a section for petrrol prices. It was possible to convert a price up to 50p a litre...
That illuminated bottle of Lucozade that used to be on that building on the Chiswick Flyover.
I have one of the little books that converts everything into decimal
Do you mean a logarithm book?
Anybody remember those lick on tattoos you got with a packet of bubble gum,shame you don't see them any more (well for me anyway)
Cans of Lucozade. Its all plastic bottles now.