Shoe fitting

As a child, the highlight of buying new shoes was looking at one's skeletal feet. You stood and stuck your feet into a machine, which I assume must have been x-ray, and peered down to see your feet and the outline of the shoes; the system ensured that the shoes you were buying were the right size. I cannot remember whether I ever used one of those machines when I was an adult so maybe it was only for children. When did they stop using them?