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The First 100 Years
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Instruments
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Spectroheliograph
Views: 4419
Nebular Spectrometer
Views: 2927
Nebular Spectrometer after 1952 fire
Views: 2791
Wehner
Views: 3625
Wehner
Views: 3629
Wehner
Views: 3592
Moon camera
Views: 3491
Rotary photometer
Views: 3635
Rotary photometer
Views: 3754