Detail of one of the focusing screws.

Focus was accomplished by turning the two wing nuts. This changed the distance between the sample (mounted on the specimen wheel) and eyecup. Shown here are two different focus positions demonstrating the change in position of the sample holder and eyecup.

These two bars supported the sliding objective holder, now missing. It is likely that there was more than one lens in the slider. The specimen was viewed through the hole at the bottom of the eyecup.