Hand spectroscope

Penrose and Co. prism spectroscope
Lacquered brass spectroscope, length 12 cm in its cylindrical case. One end rotates to adjust the slit. Focussing of the eyepiece is by means of a friction tube. A brass cap covers the eyepiece.
Signed "Penrose and Co. | London & Paris", early 20th century.

Collection: private collection