National Museum of American History
Patent Model of a Printing Apparatus for the Blind
Johnson, Daniel A. · ca 1867
This patent model demonstrates an invention for producing embossed letters on paper for communication between blind people; the invention was granted patent number 62206. Raised letters on plungers on a disk above the table were matched with sunken letter plungers below it. The paper was squeezed between the two types of plungers by treadle force.
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