Spectrohelioscope
- Title
- Spectrohelioscope
- Collection
- Caltech Photographs
- Series
- Photographs of Individuals
- Extents
- 1 photographs
- Abstract
- Perspective drawing of spectrohelioscope grating box and line shifter. Pencil and Ink on Mt. wilson letterhead stationery, backed with graph paper, 11 x 8.5 inches, unsigned and undated. Porter Papers.