
Glass positive:- Spectroheliogram

Glass positive:- Spectroheliogram, H and Bright filaments, T.Royds Kodaikanal Observatory, South India, 1926, February 22d 9h, 4m, 10"x10"
Glass positive:- Spectroheliogram, H and Bright filaments, T.Royds Kodaikanal Observatory, South India, 1926, February 22d 9h, 4m, 10"x10"