Fraction Bars "Wiener Bruchrechentafel"

Educational Tool for teaching Fractions to the Blind.

• Original design dates back to 1910 or earlier.
• Idea to recreate the design for 3D-printing by Golan Levin.
• Discovery of original design and CAD model by Martin Schneider.

Source: Archive.org

Alexander Mell, Der Blindenunterricht. Vorträge über Wesen, Methode und Ziel des Unterrichtes in der Blindenschule, 1910