Dark green glass sun filter in brass slider mount for use at the eyepiece of a telescope, unsigned, English, 1824-1831. Inscription indicates that the glass was blistered whilst observing the sun with a five feet telescope at the Royal Observatory Greenwich, England. It is likely that it was originally in the possession of Smyth due to his association with the United Services Institution.
- Object Number:
- solar filter
- furnishing and equipment
- tools & equipment
- optical instrument
- optical instrument component
- optical filter
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