Precision protractor
1920
- Title
- Precision protractor
- Collection
- Caltech Images Collection
- Series
- Scientific Instrument Photographs
- Identifier
- ST-GH-027
- Dates
- 1920
- Extents
- 1 photographs
- Abstract
- Keuffel and Esser precision brass three-arm protractor. Model 3778. Housed in oak box.