A rare 'N°4' portable monocular microscope, signed POWELL & LEALAND 170 Euston Road LONDON , with detachable eyepiece and body tube, single nose-piece, rack-and-pinion and fine focusing screw, square mechanical stage on turning axis with travelling locking screw, sub-stage condenser, plano-concave mirror on sliding collar, with folding tripod stand, - 14¼in. high, with 2in., ¼in., ½in., objectives with lieberkuhn collars, and other accessories, in fitted mahogany case - 10¾in. wide
A rare 'N°4' portable monocular microscope, signed POWELL & LEALAND 170 Euston Road LONDON , with detachable eyepiece and body tube, single nose-piece, rack-and-pinion and fine focusing screw, square mechanical stage on turning axis with travelling locking screw, sub-stage condenser, plano-concave mirror on sliding collar, with folding tripod stand, - 14¼in. high, with 2in., ¼in., ½in., objectives with lieberkuhn collars, and other accessories, in fitted mahogany case - 10¾in. wide
.jpg "Quelle: Christie's")
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