- 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
