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JAMES SMITH MICROSCOPE ERECTING LENS
The Erector Lens was an accessory which served to allow the image,
usually reversed and backwards in
orientation when seen through the microscope, to be seen in the correct orientation.
This was of value mainly for
dissection under the microscope to allow normal planes of reference for movement of the dissecting tools.
Like most examples, this one is designed to screw into the bottom of the draw-tube.