UNUSUAL HELICAL FOCUSSING MICROSCOPE BY DRING AND FAGE, English, second half 19th century, signed on the base “Dring & Fage, 145 Strand, London.” Made of contrasting chemically darkened and bright lacquered brass, the microscope extends from 13” to 18-1/2” (33 – 47 cm) tall by drawtube and by main tube helical external screw focussing. It has a sturdy brass horseshoe base and inclining limb, and is equipped with rear pillar vertical fine focus motion, one ocular, one objective (Swift
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