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 |