- Digital Commonwealth
- Perkins School for the Blind
Two boys standing behind a table with two grooved, wooden rods on a frame in front of them. The boys hold their hands out with fingers flat. Imperial Royal Institute for the Education of the Blind, Vienna. Alexander Mell.
Black and white photograph
- Samuel P. Hayes Research Library, Perkins School for the Blind, Watertown, MA. Contact host institution for more information.