Adams microscope body optics

The eyepiece consists of two lenses separated by a 1cm space. Top lens dia=17mm, bottom lens dia=31mm. Effective f=2.5cm
Field lens dia=36mm, f=7.5cm.
7.5cm
11.5cm
Objective lens(s)
Eyepiece
Field lens fitted into down tube
Microscope body disassembled.
A: Eyepiece; B: Field lens; C: Objective