Rolling parallel ruler
1930
- Title
- Rolling parallel ruler
- Collection
- Caltech Images Collection
- Series
- Scientific Instrument Photographs
- Identifier
- ST-GH-026
- Dates
- 1930
- Extents
- 1 photographs
- Abstract
- Keuffel and Esser 18-inch rolling parallel ruler. Model 1758. Brass construction, encased in wooden box.