Body components of the Powell & Lealand Model No. 3 compound microscope. A: Pol objective (below); B: Body tube; C: Drawtube; D: Huygenian eyepiece. There is an aperture but no Field lens in the body.
Huygenian eyepiece with two plano-convex lenses. Field lens dia=31mm, f=65mm; eye lens dia=21mm, f=40mm.
Carl Zeiss polarized light objective. The thumbwheel rotates the internal Nicol prism.
The objective consists of a single objective lens (probably an achromatic doublet) and a Nicol prism (L). Prism dimensions are 13x10x25mm
Objective serial number: 6892
Carl Zeiss Jena
On the reverse is "8.3", which is probably the magnification.
The plano-convex objective lens: dia=6mm, f=21mm.