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Binocular Eyepiece in Case, by C. D. Ahrens, London, c.1871

Inventory Number 91539

Acknowledgement: © History of Science Museum, University of Oxford, inv.91539

Item type
Object
Provenance
Lent by the Royal Microscopical Society with their collection. Presented to the Society by Carston D. Arhrens, 31 October 1877
Primary inscriptions
.1: "R.M.S. No 54" on main body .2: "R.M.S. No 54" on one binocular tube .3: "R.M.S. No 54" on rim of both eyepieces .4: "BINOCULAR EYEPIECE / FOR HIGH POWERS. / BY C. D. AHRENS, / LONDON." stamped into leather of upper surface
Inventory No
91539
Accession Number
1970-101/part

Description

A double-image prism is made from Iceland spar (calcite) and is located in the copper alloy tube that inserts into a microscope. Above the prism is a double-wedge prism of flint glass to render the light achromatic. Symmetrical tubes take the rays to the eyes, and intraocular distance is varied by rackwork. Two eyepieces are also present.

The case is covered with red leather and inside, lined with purple silk and blue felt.

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