Hand Spectroscope By Penrose & Co Ltd.
A Hand spectroscope by Penrose & Co. Ltd. London. C 1910. The brass handspectroscope displays the color of the spectrum of the light source. The focusing is done by screw with a transfer mechanism and the width of the spectrum can be reclined. The company A.W. Penrose & Co. Ltd. was from 1907 to 1927 operational. Length 21 cm and complete with the lens cap.