Ball-joint at the base of the support pillar.
The microscope body screws into this brass support. The support is 39cm long.
The stage is supported on the pillar by being fastened to a collar by tightening screw A. The jam screw (B) holds the stage support in place.
This mount and fastener held an articulating condenser lens.
The gimbaled mirror may have been added by Culpeper. The mirror dia=8.9cm. It is silvered on only one side.