The Huygenian eyepieces have two plano-convex lenses with the flat surfaces both facing up. The aperture stop is between them. Top lens dia=2.0cm, f=3.5; bottom lens dia=2.9cm, f=6.5. The distance between lenses is 6.5cm.
Drawtube positions.
Rack and Pinion mechanism for adjusting the interpupillary distance.
Wenham prism to engage binocular vision.
Binocular imaging with the Wenham prism in place (L). Monocular position with the prism out of the optical path.
The microscope has only this high-magnification objective.
The illuminating mirror has a plane and convex side. Diameter = 6cm.