F3106-1

Prisms and box Long Caption: Seven crown triangular prisms in a wooden box. They were presumably intended to be used in experiments relating to spectroscopy, or perhaps to build a spectroscope. Credit line: © National Maritime Museum, Greenwich, London, Herschel Collection Object: AST1030.87 Artist: unknown Date: unknown Medium: glass; wood Size: prism: 19 mm x 37 mm x 25 mm Click here to buy a bespoke print of this image.