Slide rule
1900
- Title
- Slide rule
- Collection
- Caltech Images Collection
- Series
- Scientific Instrument Photographs
- Identifier
- ST-CH-09
- Dates
- 1900
- Extents
- 1 photographs (negative)
- Abstract
- Polyphase slide rule; ivory and wood in original box with original manual, “The Mannheim and Polyphase Slide Rules.” Mfg. Keuffel & Esser Co, NY.