Protractor (B)
- Title
- Protractor (B)
- Collection
- Caltech Images Collection
- Series
- Scientific Instrument Photographs
- Identifier
- ST-PH-18
- Extents
- 1 photographs (negative)
- Abstract
- Wood case. Larger than ST-PH-17, but otherwise similar. Mfg: Keuffel and Esser Co., NY.