Iris diaphragm
Iris diaphragm at the observatory in Brussels. Photograph, around 1930
Picture No
10471024
Media ID
46056471
Size
3543px x 2565px
(1.1MB)
Credit
Mary Evans/brandstaetter images/Austrian Archives (S)
Date
1930
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Diaphragm Iris Observatories Observatory Telescope Telescopes
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