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Cemented glass prism for direct-vision spectroscope

1920-1950

Direct-vision dispersing prism consisting of two glass prisms enclosing a prism-shaped space

Compound prisms

1876

Compound prisms

1876
Direct-vision dispersing prism consisting of two glass prisms enclosing a prism-shaped space for filling with a highly-refracting liquid

Direct-vision dispersing prism

Spectroscope by Browning for Aurora, H.O.^.3. portable form, on brass folding tripod allowing for horizontal and vertical rotation of instrument, direct vision compound prism tube is engraved "John Browning, London. Instrument detachable into 3 parts, telescope prism and collinator, instrument when closed is 18" long and 15" high, when on stand, in fitted mahogany case

Spectroscope by Browning for Aurora

1870-1890