Prism, known as Nicol prism

© National Museums Scotland

000-100-102-648-C

Prism
probably made in London

© National Museums Scotland

000-100-102-694-C

Nicol prism
probably made in London

© National Museums Scotland

000-180-000-918-C

Prisms, known as Nicol prisms
made in England

© National Museums Scotland

000-100-102-689-C