diplograph

from The Century Dictionary.

• noun A Swiss writing-apparatus for the use of the blind, consisting of lettered disks with mechanism to rotate them and to bring any letter desired in position to imprint it on a sheet of paper placed in the machine. It is practically a clumsy form of the type-writer.

from the GNU version of the Collaborative International Dictionary of English.

• noun An instrument used for double writing, as one for producing embossed writing for the blind and ordinary writing at the same time.