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Giving sight to blind typers

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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