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Andrew Ross Compound Monocular Microscope

This microscope was termed the Standard No. 1 by Ross when it was introduced in the early twentieth century. The model featured below was redrawn from a photograph of the original microscope, which is part of the Billings microscope collection at Walter Reed Army Hospital in Washington DC.

The rectangular pillar and circular stage rest on a square brass horseshoe base that is heavy enough to ensure a minimum of vibration. The stage plate rides on a trunnion and is secured tightly to the pillar. A lever lock controls rotation of the circular mechanical stage. Positioned at the apex of the tubular limb is a double-milled pinion that allows adjustment of the microscope body. The substage condenser is positioned on a fixed bar and adjusted with a rack and pinion mechanism. An Abbe condenser fitted with an iris diaphragm provides the cone of illumination for the microscope through the double mirror located just beneath the condenser.

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