This is a fine example of the middle microscope, Stand-III. It is supplied with oculars numbered I and III and objectives numbered 1, 3, and 7. Included are three substage aperture stops and holder.

An earlier example of this model from 1878 is also represented in this collection. It differs from the this model only in the mechanics of the substage. While the substage on this microscope incorporates a swivel mounting, the substage on the later model has a removalbe brass slide.