Higher (H1) calcium vapour surrounding the great sun-spot of 1903
- Made:
- 1903 in Lake Geneva
- photographer:
- F Ellerman and
- George Ellery Hale
Higher (H1) calcium vapour surrounding the great sun-spot of 1903, October 10, 10h, 59m. C.S. T., slit at 3967.5 suns diam. = .77 metre taken with the Rumford spectoheliograph and 40-inch refractor of the Yerkes Observatory by G.E. Hale and F. Ellerman
