The condenser optics consists of two lenses (biconvex and plano-convex top lens), a filter holder, and a condenser iris. The assembly press-fits into the condenser mount. Condenser disassembled. A: Bottom lens; B: Top lens

Condenser showing iris control (Arrow) and filter holder (extended).

A: Condenser focus knob
B: Condenser lateral movement
C: Condenser axial movement

Condenser iris

Position graduations for the polarizer. When used as a horizontal microscope, the dovetail was the attachment bracket for an illuminating lamp.