
Glass positive:- Spectroheliogram

Glass positive:- Spectroheliogram, H and Bright filaments, T. Royds Kodaikanal Observatory, South India, 1926, February, 22d 8h 8m, 10" x 8"
Glass positive:- Spectroheliogram, H and Bright filaments, T. Royds Kodaikanal Observatory, South India, 1926, February, 22d 8h 8m, 10" x 8"