Catalogue Number: 1865
(Instructions for use of) The Barrett Relative Accommodation Stereoscope
Sub-Category: Ophthalmic product manual/instructions
Corporation: R Archer and Sons Ltd
Year Of Publication/Manufacture: 1950 ?
Time Period: 1940 to 1999
Place Of Publication/Manufacture: London
Publisher/Manufacturer: R Archer and Sons Ltd
Description Of Item: Four page leaflet giving a description, method of use and interpretation of the Barrett Relative Accommodation Stereoscope with an illustration of the instrument on the front page
Historical Significance: This leaflet gives the principles and instruction for use of the Barrett Relative Accommodation Stereoscope, which was designed by C D Barrett FBOA (Hons). The instrument measures relative accommodation without any change in image size as is the case when plus lenses are required. The nodal point of the eye is at the focal point of the lenses of the instrument. It is described by Barrett in the Optician of May 21, 28 and June 4 1948. It was available from R Archer and Sons for 3 UK pounds and 15 shillings.
How Acquired: Ex Nathan Library
Location: Archive office. Pamphlet and ephemera filing cabinet. Drawer 4