细节
A laboratory spectrometer
by Adam Hilger Ltd., London, in lacquered and oxidised brass with grey-enamelled iron base with vernier scale of densities with microscope and provision for electric illumination -- 16in. (40½cm.) wide, early 20th century
by Adam Hilger Ltd., London, in lacquered and oxidised brass with grey-enamelled iron base with vernier scale of densities with microscope and provision for electric illumination -- 16in. (40½cm.) wide, early 20th century