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Giving sight to blind typers

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On the earliest typewriters, the typebars swung upward, striking the underside of the platen, and out of view from the operator. Known as blind typers, only a redesign of the machine would make them visible. Or… one could employ this contraption, as mentioned in Scientific American, May 12, 1894:

The Shorthand Review also reported on the prism, November 1893 —

© 2019 – 2018, Mark Adams. All rights reserved.

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