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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.

BACK TO TWENTIETH CENTURY MICROSCOPES

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