Posts Tagged ‘Which’

How Do Vending Machines Know Which Coins And Notes You Put In?

Saturday, January 23rd, 2010

I heard it was to do with weight and size but they’d have to be very precise and surely coins lose weight over years by being chipped away etc. I’ve tried making fake coins but they never get accepted despite me using the same size and weight as a normal coin. What about notes, how [...]

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