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80's rulers

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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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Avatar Image mibn2cweus
lenticular ruler

how they work
17:44 Tue 27th Feb 2007
Avatar Image shellypoops
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Thats the one!
Thanks for your help
18:08 Tue 27th Feb 2007

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80's rulers

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