MusEYEum Online Catalogue

Welcome to the online catalogue of the British Optical Association Museum. Here you can search for both museum artifacts and archives. Data is transferred from our Collections Management System to this website on a regular basis.


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crossed cylinder confirmation test
crossed cylinder
20th c.
metal; glass
overall: 123 x 42 mm

Crossed cylinder. Black metal rim and fluted handle with +12/-12 disc on stem. Round lens with frosted edges to form a square with two white dots and two red dots without.


Ex Keeler Collection

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