Differential ratio polariscope by Negretti and Zambra, with rotating prism

Made:
London

differential ratio polariscope by Negretti and Zambra, London, type devised by J. J. Field in 1869. fitted with a large Nicol prism 1 1/4"x2 1/2", with analysing prism and descriptive pamphlet

Details

Category:
Optics
Object Number:
1920-779
type:
polarizer and nicol prism
credit:
J.C. Stevens (Auction Sales)

Parts

Differential ratio polariscope by Negretti and Zambra

Differential ratio polariscope by Negretti and Zambra

differential ratio polariscope by Negretti and Zambra, London, c. 1880, type devised by J. J. Field in 1869. fitted with a large Nicol prism 1 1/4"x2 1/2", with analysing prism and descriptive pamphlet

Measurements:
overall: 80 mm x 105 mm x 140 mm, , .625kg
Materials:
metal , copper (alloy) , brass , glass , selenite and steel
Object Number:
1920-779 Pt1
type:
polarizer and nicol prism
Rotating prism in brass box for differential ratio polariscope

Rotating prism in brass box for differential ratio polariscope

Rotating prism in brass box for Field's differential ratio polariscope by Negretti and Zambra.

Object Number:
1920-779 Pt2
type:
polariscope