Accession No

1524

Brief Description

polarising apparatus, by E. Ducretet et Compagnie, French, 19th Century

Origin

France; Paris

Maker

E. Ducretet et Compagnie

Class

optical

Earliest Date

1800

Latest Date

1900

Inscription Date

Material

metal (brass, copper, oxidised brass); glass

Dimensions

height 530mm; breadth 405mm; depth 240mm

Special Collection

Cavendish collection

Provenance

Transferred from the Cavendish Laboratory, University of Cambridge.

Inscription

‘E. DUCTRETET & CIE
A PARIS’ (graduated circle)

Description Notes

Copper tripod base supporting brass column. Polarising apparatus pivots on the top of the column by means of a knurled brass screw. Eyepiece adjusted by means of a knurled brass screw; eyepiece section moves on a ratcheted column. Tilting rectangular mirror. Degree circle attached above eyepiece-object glass column. This is divided 0 - 180˚ - 0, numbered by 10˚, graduated to 1˚. Vernier moves over scale and can be locked in place.

Complete.

References

Events