Accession No

3420

Brief Description

refractometer, possibly Abbe type, by Carl Zeiss, German, 1895 (c)

Origin

Germany; Jena

Maker

Carl Zeiss

Class

optical

Earliest Date

1890

Latest Date

1900

Inscription Date

Material

metal (at least two white metals, oxidized brass, blued steel); glass; cloth (velvet); wood; paper (card); organic (cotton wool)

Dimensions

height 315mm; breadth 119mm; depth 115mm; box height 400mm; breadth 208mm; depth 162mm

Special Collection

Provenance

Transferred from Department of Pathology, University of Cambridge, Cambridge, England, 19/09/1986.

Inscription

‘No 1654. Carl Zeiss Jena.’ (on base)

Description Notes

White metal telescope attached to divided arc revolve around the centre of the arc on a horizontal pin, supported a white metal column mounted on a black-finished brass foot. At the objective end of the telescope is a system of revolving AMICI prisms rotated by means of a knurled screw, with scale divided 0 - 60 - 0. The telescope points at a prism-shaped holder for the sample. The sample holder can be angled relative to the telescope by an index arm which then reads the refractive index directly off the graduated arc, on a silvered scale divided 1.3 - 1.7 numbered by 0.01 subdivided to .001. Index arm carries reading lens with cut-away section to aid reading of scale. A swivelling mirror mounted on the base is used for directing illumination. Fitted wooden box with white metal hinges and lock (with key), partially lined with blue velvet. Contained in the box is a spare sample holder and a card case marked ‘Justin. z. Abbe’schen Refr.’ containing glass block marked ‘n-D 1.5734’.

Condition good; complete

References

Events