Prism of Thallium glass on wooden plinth

Made:
1865-1875
Prism of Thallium glass on wooden plinth, c.1870

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Prism of Thallium glass on wooden plinth, c.1870
Science Museum Group
© The Board of Trustees of the Science Museum

Prism of Thallium glass on wooden plinth, c.1870. Refractive Index 1.751, Specific Gravity 4.75 (length 1 5/8").

Details

Category:
Optics
Object Number:
1915-311
Materials:
glass (thallium), mahogany (wood) and chamois leather
Measurements:
overall: 45 mm x 70 mm x 70 mm, , .18kg
type:
prism - optical
credit:
Sir William Crookes