tongs for demonstrating double refraction using heat

tongs for demonstrating double refraction using heat, with 10 glass cubes, by R. Fuess, Berlin, Germany, c. 1885.

Details

Category:
Optics
Object Number:
1885-110
Materials:
metal (unknown), iron, glass, wood (unidentified), copper (alloy) and brass (copper, zinc alloy)
Measurements:
tongs: 240 mm x 95 mm x 35 mm, , .365kg
each cube: 10 mm x 10 mm x 12 mm, ,
type:
tongs
credit:
Fuess, R.