This month's issue of the Scientific American explains exactly how vending (or cash) machines work!! I am so excited to share this important piece of information to all my fellow bloggers! Basically, inside those machines, there is something called a BILL VALIDATOR. Googi, Kudos to you for your enlightened idea... it's exactly how the bill validator works! The bill validator has rollers that pull the bill inside.... it even has a "tail end" beam light to ensure that the entire bill has been inserted (to avoid anyone from pulling it out half way) The bill's magnetic ink, the position of the portrait, and the density of the bills makes each note unique. There is then a light beam that scans for these characteristics and then compares the data against a table of reference values to determine the bill's denomination and authenticity. And within seconds, the machine will be able to tell what denomination the bill is! Cool, isn't it??
http://www.sciam.com
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