Wenham’s binocular microscope by Ross – c 1878

 A stately example of the Jackson stand Ross microscope.  Ross made three principal models.  His first, the Ross base with its bar-limb construction, dominated microscope design for almost half of the 19th century.  The second model seen here was by Jackson and introduced in the 1875 Ross catalog.  The Jackson model offered greater stability for the hefty Ross instruments.  This design was later evolved into a third type, the Ross-Zentmayer stand, with its swinging tail piece, and twin pillar support on a flat “A” shaped base.

 The microscope stands 17” tall when closed.  It is signed on the base, “Ross, London, 4170”.   It is also signed on the nose piece, “Wenham’s Binocular, by Ross, London”.  Coarse focus is rack and pinion, fine focus is with an indicator micrometer knob located behind the nose piece.  The microscope has a mechanical stage with full lateral movement and rotating stage plate.  The slide holder is spring loaded and holds the slide securely in place.  The 2 ½” diameter substage mirror is plano-concave in excellent condition on both sides.  The substage condenser assembly has rotating and centering adjustment knobs.  No condenser is present.  Objectives include a 2” lens in signed Ross canister, a 1” lens in signed Ross canister, and a 1/6” lens in unsigned brass canister.  The binocular eyepiece set is marked “A”.  Two other monocular eyepieces are included and marked with a “B” and a “C”.  The Wenham prism is in excellent condition.  The binocular eyepiece width can be adjusted with rack and pinion control.  All rack work on the microscope is in fine operating condition.  The optical system is very fine, producing clear and sharp images commiserate with a Wenham binocular model.  The microscope is finished in lacquered brass.  Lacquer coverage is complete with only minor wear in keeping with age.  The microscope is housed in a fitted chestnut case with brass carry handle.  A standing bullseye condenser completes the set.  The Ross-Jackson limb model is a large, elegant, and superbly crafted instrument.

Item 1302

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