French, c.1840, signed in script to top bodytube ‘Microscope Achromatique Perfectionne par Charles Chevalier, Ingenieur Opticien, Palais Royal a Paris’, on swept folding tripod base, with tall supporting main column to centre, compass type joint to top with square column supporting concave mirror on sliding collar, stage incorporating focusing mechanism operated via turned ivory wheel, nose piece with condenser lens on articulated arm, large diameter body tube with single drawer tube, objective and eyepiece with dust cover, height 47cm