Objectives:
"3" (f=1mm; high magnification)
"2" (f=5mm; low magnification).

Objective lenses in the stacked configuration. They can be used separately or stacked. As shown, the working distance (WD) is 2mm. Objective #3 WD=8mm.

Lens aberrations were reduced by using stops in all lens paths. Objective stop (B), downtube stop (A).

The optical path of the Gould-type microscope is typical for that era. It consisted of an objective lens system (A), the field lens (B), and an eyepiece lens system (C).