Spectrohelioscope
1929
- Title
- Spectrohelioscope
- Collection
- Caltech Images Collection
- Series
- Individuals
- Identifier
- RWP3.1-1
- Dates
- 1929
- Extents
- 1 photographs
- Abstract
- Perspective drawing of coelostat, second mirror and telescope lens of spectrohelioscope. Pencil and ink on paper, backed with graph paper, 10.75 x 8.5 inches, signed R. W. P., dated 1929. 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 VIII. Porter Papers.