English, c.1900, engraved 'A. HILGER LONDON' and engraved to the top 'TELESCOPE' constructed of lacquered brass with two glass prisms held in place with a screw, in plush-lined case, with label that reads'Lippmans apparatus for focusing a spectroscope collimator , Lea Johnston Pr? Optics

Footnote: this is part of a collection of instruments from the Oxford University Physics Department