Cranmer Abacus prototype

Abacus

Accession Number:
1992.369
Description:
The frame is made of black polystyrene. Abacus has red felt backing, white plastic beads, and 13 metal rods. Each rod holds 1 bead above the divider bar and four beads below. There are raised unit markers on the divider bar and at the bottom of the frame. "A.P.H." appears at the top of the frame in raised letters.
Height:
3
Width:
5.625
Depth:
0.5
Date Made:
ca. 1963
Maker:
Cranmer, Terrence V.
Place of Origin:
Louisville, KY
Collection:
APH Collection
History/Provenance:
APH Collection
Subjects:
Abacus. Arithmetic. Instructional aids, tools, and supplies. Mathematics. Prototypes.
Dimension Notes:
overall
Made:
American Printing House for the Blind
Material:
Plastic, metal, felt
Exhibit Label:
Abacus
Updated:
04/23/2014