Model 4-B Circular Slide Rule

Rule, Slide

Accession Number: 2001.165

Description: Black vinylite disc has raised numerals and braille notation, with further divisions represented by evenly spaced single dots and double dots. One side (the linear scale) has a single plastic pointer and the other side (the logarithmic scale) has two plastic pointers, fastened to the center of the disc by brass screws. A knurled nut allows the setting/adjustment of the pointers on the logarithmic scale. Includes 3 pages of typewritten instructions for "Model 4-B Circular Slide Rule" and a typewritten note.

Date Made: ca. 1950

Place of Origin: New York

Credit Line: Gift of Visually Handicapped Services, Detroit Receiving Hospital

Subjects: Instructional aids, tools, and supplies Mathematical instruments Slide rules

Made: American Foundation for the Blind

Material: Rigid vinyl , plastic, brass

Updated: 08/13/2015