Brass, bar-limb microscope with Y-foot by Andrew Ross, London, circa 1845. Signed "A. ROSS, LONDON. No. 334" on top of foot. Measures 19" tall in closed position. Coarse focus is rack and pinion, and fine focus is by a graduated knob attached to a short lever in the bar-limb. The microscope has a mechanical stage with two controls for lateral movement. Additionally, the slide tray rotates. All mechanical motion is excellent. The finish is lacquered brass, and the instrument retains most of its original varnish. The microscope comes with 6 eye pieces and 5 lenses each in its own brass cylinder case. Although it appears several components are missing, it comes with assorted accessories nested in fabricated locations inside the box. The front element of the lens can be removed to convert to a lower power. There is no condenser with this earlier microscope, but it has a prism in addition to the plano-concave mirror to focus light up to the table. The instrument is housed in a dove-tailed mahogany case with a brass handle and two doors, front and back. The locks function and includes what is presumed to be the original key. The small brass plate at the keyway is missing on one door. This venerable microscope has the claw foot and solidly built base that were introduced and made popular by Andrew Ross who died in 1859.
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