Optics consist of an objective, field, and eyelens. All are biconvex simple lenses. An aperture (dia=1.5cm) is set inside the eye tube.
Optics of the Tiedemann drum microscope. A: Objective; B: Field; C: Eyelens.
The eyelens is set inside the upper body tube. Dia=2.0cm, f=3.0cm.
Assembled upper body tube with the wooden dust cap removed. The tube is constructed of fruit wood. Its upper half is painted dark brown. The lower half is unpainted.
The simple, biconvex objective lens is set inside a wooden cap. Lens dia=6mm, f=5mm
Assembled objective lens
The field lens is set into the bottom of the upper body tube and maintained in place by a wooden ring. Field lens dia=3.8cm, f=5.0cm.