The cylindrical objective lens (right) press-fits into this circular mount. The pin (arrow) is the locating mount for the camera lucida mirror assembly.
Objective lens. Diameter=25mm, f=40mm. Magnification is approximately 2.5x
The camera lucida mirror assembly mounts onto the locating pin, and is maintained in place by a swing-arm (arrow). Above the objective (B) is the prism assembly (A).
Camera lucida mirror assembly. The mirror (8.5x5.0cm is mounted to a brass frame. The frame can be rotated to accommodate of the drawing paper.