A black enamelled and lacquered brass "INVERTED" spectroscopic analyser signed W.Watson & Sons Ltd London 39324, with light source and diaphragm, mounted on square faced pillar, with weight counter balance, the stage and light source mounted on a rack-and-pinion adjustment, square stage with rack-and-pinion adjustment, over twin nosepiece with parabolic objectives, the twin spectroscopic telescopes with fine focusing screw, on large Y shaped stand - 18½in.high