Accession No

3374

Brief Description

polarimeter, by Franz Schmidt and Haensch, German, 2/2 19th Century

Origin

Germany; Berlin

Maker

Franz Schmidt and Haensch

Class

optical

Earliest Date

1850

Latest Date

1900

Inscription Date

Material

metal (cast iron, brass, oxidised brass, white metal); glass

Dimensions

length 520mm; breadth 230mm; height 435mm

Special Collection

Provenance

Purchased from Sotheby’s, London, England; lot 90, 25/02/1986.

Inscription

‘Franz-Schmidt & Haensch
Berlin
NO 3557’ (tube support)

Description Notes

Black-painted cast iron tripod base supports brass column on which brass mount for polarimeter tube is set. Black-painted tube with hinged cover for specimen tube. Screw-fit objective with orange filter. Degree scale at eye end turned by ratchet operated by knurled brass screw; scale divided 0 - 90˚ - 0 - 90˚ - 0, numbered by 10˚, subdivided to 30´, with twin verniers reading to 1´. Twin reading microscopes. Pushfit eyepiece. Angle of incident light can be adjusted by a brass lever which moves over a scale divided 10˚ - 0 - 10˚, subdivided to 1˚.

References

Events