The British Refracting Unit, No 1662

Catalogue Number: 1139
The British Refracting Unit, No 1662
Category: Equipment
Sub-Category: Refractor Phoropter Phorometer
Year Of Publication/Manufacture: c1933
Time Period: 1900 to 1939
Place Of Publication/Manufacture: Croydon, England
Publisher/Manufacturer: Ellis Optical Co
Description Of Item: Black metal instrument with stem for suspension arm mounting.Multiple lenses: spheres +17.75 to -17.75, Cyls to -3.75. External front mounted variable rotary prisms, cross cyls & Stephens Phorometer. Internally mounted auxilliary lenses including Maddox Rods & Ret (+1.50) lenses. Horizontal spirit level, variable PD. Imprinted: THE BRITISH REFRACTING UNIT No 1662/ PATENT Nos 402516, 402876, 403661/ ELLIS OPTICAL COMPANY/ CROYDON/ ENGLAND. H: 28.0 cm x W: 29.0 cm x D: 12.0 cm
How Acquired: Not known
Condition: Good
Location: Archive room. West wall. Unit 3 Drawer 5

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