Spectrohelioscope
- Title
- Spectrohelioscope
- Collection
- Caltech Photographs
- Series
- Photographs of Individuals
- Extents
- 1 photographs
- Abstract
- Schematic elevation of spectrohelioscope components. Ink on gray paper, 9.75 x 7.75 inches, unsigned, undated. George E. Hale, “The Spectrohelioscope and its Work, Part I: History, Instruments, Adjustments, and Methods of Observation, The Astrophysical Journal 70 (December 1929): 265-311. Published as Figure 2. Porter Papers.