Jul 7, 2020
These embossed letter specimens are examples of Boston Line Type. Boston Line Type was developed in 1835 by Samuel Gridley Howe as a raised letter system of printing for the blind. Reading it tactilely, however, was difficult and the embossed alphabet was eventually abandoned for a simpler dot system.
commontouch.librarycompany.org
[Collection of samples of raised-letter line types for printing for the blind]