UNfound:

The Youmans Writing Machine for the Blind was invented ca.1840 by Edward Livingston Youmans of New York, N.Y. Judging by the illustration, the Youmans appears to be more of a writing guide rather than a writing machine like a scotograph would be.

Read more about scotographs here and here...

Have some info about this typewriter? Have you found it? If yes, please email me at Antikey.Chop@gmail.com