Hand spectroscope

Penrose and Co., London & Paris
Lacquered brass spectroscope (prism 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.

private collection