The British Refracting Unit, No 1652

Catalogue Number: 1123
The British Refracting Unit, No 1652
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 for measuring refractive error and binocular functions with stem for suspension arm mounting. Multiple lenses; spheres +18 to -9.00 DS, cyls to -3.75 DC. Variable prisms (Risley & Stephens Phorometer). Jackson's cross cylinders mounted in front. Horizontal spirit level. Imprinted on the front face: The British Refracting Unit No 1652 and the right, Patent Nos 402516, 402876m 403661 on the left and on the base of the PD adjustment 'Ellis Optical Company England' W: 28.0 cm x H: 33.0cm x D: 12.0 cm
Condition: Good, paintwork worn
Location: Archive room. West wall. Unit 3 Drawer 4

Search the archive:

Author or Inventor:
Catalogue #
Name of Donor