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Medium level (H) calcium vapour, surrounding the great sun-spot of 1903, October 10, 9h. 39m. C.S.T. slit at 3966.5, suns diam = .77 metre, taken with the Rumford spectroheliograph and 40-inch refractor of the Yerkes Observatory by G.E. Hale and F. Ellerman

Medium level (H) calcium vapour

1903
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

Higher (H1) calcium vapour surrounding the great sun-spot of 1903

1903
Calcium and Hydrogen Flocculi, surrounding the great Sun-spot of 1903, October 9 low level H1. slit at 3962, 3h 43m. C.S.T., medium level H1. slit at 3966, 3h 43m. C.S.T. taken with the Rumford Spectroheliograph and 40-inch refractor of Yerkes Observatory by G.E. Hale and F. Ellerman

Calcium and Hydrogen Flocculi

1903
Calcium and hydrogen flocculi, surrounding the great sun-spot of 1903, October 9, High level H2 slit at 3968.6, 3h.30m. C.S.T. Hydrogen slit at centre of Hs, 1h. 4m C.S.T., taken with the Rumford Spectroheliograph and 40-inch refractor at Yerkes Observatory by G.E. Hale and F. Ellerman

Calcium and hydrogen flocculi

1903