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Title: Wollaston-type optometer, with graduated ebony bar traversed [Go to resource]
Description: 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 License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Temporal: 1825-1835 Source: Science Museum Identifier: 1954-269 Go to resource More Like this...
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