Spectrum analysis, Exhibited at the Royal Polytechnic Institution

Print. engraving, col.: 'Spectrum analysis, Exhibited at the Royal Polytechnic Institution, London. 1. simple spectrum. 2. silver. 3. thallium'. [1880-1890s]. 17x12cm. Scene in lecture theatre; to male audience, one woman student in [our] back row; showing spectrum analysis by light projection, projector operator with stand; the early days of formal technical education