80's rulers

shellypoops | 16:49 Tue 27th Feb 2007 | How it Works

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Please can someone help? Do you remember thoses rulers from the 80's that had a moving image on it. It is hard to describe when you dont know what they are called, but the idea was that you had to move it slightly to get the image to move? What were they called and how are they made?

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lenticular ruler

how they work

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Thats the one!
Thanks for your help

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80's rulers

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