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Grunow Inverted Compound Binocular Microscope

Signed "J. & W. Grunow, New York", this brass inverted microscope was made for Major General George H. Thomas of the United States Army in 1867. The original model, from which our 3-D Studio Max drawing is derived, resides in the Billings Microscope Collection at the National Museum of Health and Medicine at Walter Reed Army Hospital in Washington, D. C.

Attached to the circular base is a rectangular pillar that has a double vertical rack and a block pillar at the rear. The microscope limb has a single milled-head vertical pinion with a double curved arm and oval plate attached to a rack tube. Positioned above the rack tube is a cased prism, designed to direct light onto the specimen. The brass stage plate is fixed to the limb and has a 7/8-inch central aperture. The eyetubes are threaded and screw into a prism box fastened to the base, and having a single ocular that is pointed upward towards the underside of the stage.

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