This microscope was designed and built by William Ladd, a notable London instrument maker, who signed the work in 1864.

Built much like an optical bench, this microscope uses an unusual chain mechanism fitted into the limb for focusing. The stage, condenser and mirror fit onto the dovetailed limb and are (with the exception of the plano-concave mirror) moved by a rack and pinion mechanism. This microscope is part of the Royal Microscopical Society collection and has been described and photographed by Gerard Turner. The long lever attached to the limb is actually a fine-focus mechanism clamped with a ring and screw to the focusing axle.

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