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Glass positive:- Spectroheliogram

1926

Glass positive:- spectroheliogram

1926

Two magic lantern slides showing total solar eclipse

1860-1868

Glass positive:- Spectroheliogram

1926

Glass diapositive in passe-partout frame [X31] of the solar chromosphere [3

1926

Glass positive:- Spectroheliogram

1926
Glass diapositive in passe-partout frame of the solar chromosphere [ultra violet wave lengths] also known as the flash spectrum taken at Benkoelin in Sumatra on January 14th, 1926. The photograph is a copy made by the Science Museum from originals supplied by the Royal Observatory, Greenwich.

Glass diapositive in passe-partout frame of the solar chromosphere [ultra violet wave lengths]

1926
Glass diapositive in passe-partout frame [X30] of the solar chromosphere [3,900-5,000 Angstrom] also known as the flash spectrum taken at Benkoelin in Sumatra on January 14th, 1926. The photograph is a copy made by the Science Museum from originals supplied by the Royal Observatory, Greenwich.

Glass diapositive in passe-partout frame [X30] of the solar chromosphere [3

1926