Spectrometer No.522 by W. & J. George Ltd., Birmingham, complete with prism clamp and diffraction grating holder, 1920 to 1940 Spectrometer No.522 by W. & J. George Ltd. 1890-1945
Spectrometer No.522 by W. & J. George Ltd., Birmingham, complete with prism clamp and diffraction grating holder,in fitted wooden case, 1920 to 1940 Spectrometer No.522 by W. & J. George Ltd. 1890-1945