Wollaston-type optometer, with graduated ebony bar
Wollaston-type optometer, with graduated ebony bar traversed by ivory disc engraved with 15 dots and words 'COUNT THE DOTS' 'MY SIGHT', British, c. 1830
- Object Number:
- brass (copper, zinc alloy), copper (alloy), glass, ivory, metal (unknown) and wood (unidentified)
- National Maritime Museum
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