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The popular model features the Y-shaped, flat tripod base which became a characteristic of many Ross microscopes. The vertical flat pillars hold the limb by means of trunnions, and a bar attached to the top of the limb supports the optical tube, with a lever for fine focusing. The stage and the mirror are attached to the limb. This instrument is similar to the one described in the Frontispiece of John Quekett's Practical Treatise on the Use of the Microscope (1848). It comes with a wooden carrying case. Signed: A. Ross, London 563.