“Roger Appledorn takes the idea of cellophane and basically makes a bunch of new kinds of transparencies that you can print… improves the quality… helps create a lighter and lower cost version of the projector.”

Version History · Overhead projectors: Turn around

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What was described

Developed new transparency films using cellophane that improved color image quality and lowered cost of overhead projectors

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“We've been thinking about overhead projectors and transparencies as a game mechanic… you could project it and kind of change those kinds of spaces”
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“By the early 1960s, Roger Appledorn and his team invent the first overhead projector with one very important new piece of technology, which is called a Fresnel lens.”
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