The illuminating mirror has two sides: plane and convex. The mirrors are mounted in a brass frame and attached to the main support pillar via a typical gimbal. Diameter=7.6cm.
This aperture wheel is mounted under the stage. It has five apertures for controlling sample illumination.
A Bullseye lens attaches to the edge of the microscope body support. It can be positioned using a ball joint (A) as well as a rack & pinion mechanism (B). This lens would have been used to illuminate opaque samples. Lens dia=6.5cm, f=5.8cm.