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Bruce Refracting Unit
Automatic Sight Testing Co Ltd
c.1889
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Optician's chair & British Refracting Unit
Calthorpe (maker); Ellis Optical Co (maker)
c.1933
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Phorometer
American Optical Company
1930s
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Raphael's Patent Opsiometer
J. Raphael & Co
c.1891
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refracting unit / phorometer
Mid 20th c.
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refracting unit / phorometer
American Optical Company
20th c.
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refracting unit / phorometer
American Optical Company
20th c.
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Stearman Refracting Unit
Stearman Optical Co Ltd
c.1959
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Supplementary Lenses for the Stearman Refracting Unit
Mid 20th c.
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