Spectrohelioscope
- Title
- Spectrohelioscope
- Collection
- Caltech Images Collection
- Series
- Individuals
- Identifier
- RWP3.1-8
- Extents
- 1 photographs
- Abstract
- Perspective cutaway drawing of spectrohelioscope second slit, driving mechanism and life-shifter. Pencil on card stock, 10 x 12 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 Plate XII. Porter Papers.