The illuminating mirror is flat on one side and concave on the other. Dia = 5.2cm. It is mounted to a bracket that slides up and down the brass flat stock, and is held in place by friction.
The Spring stage (A) is press-fit into the stage holder (B). The Condenser optic (C) is press-fit into the protruding bottom of the spring stage (A).
On either side of the stage are a hole and slot for accessories (missing).
The condenser has a single biconvex lens; dia=1.9cm, f=5.0cm.