Compound Microscope, by Yeates & Son, Dublin, Third Quarter 19th Century

This brass copper alloy instrument stands on a Y-shaped foot. The limb is supported on trunnions. A bar, with a triangular section, can be racked up from within the limb. An arm attached to the top of the bar holds the body tube. An inner tube with detachable eyepiece housing pushes into the top of the body tube. The stage has a mechanical plate with a sprung bracket to hold specimens. The Plano-concave mirror is set in a horseshoe mount on the cylindrical lower end of the limb.