This microscope, having a Lister Limb, is constructed entirely in brass, measuring 16 inches in height inclined as shown in the photos. Coarse focusing is by rack and pinion and the fine focus utilizes a micrometer screw that operates on the nosepiece. The interocular distance is adjusted by rack and pinion. The mirror is concave and is 2¼ in diameter.
Among the accessories associated with this microscope are two objectives with canisters marked 1 and 3, a matched pair of eyepieces and a single higher power eyepiece. Also included is an aperture stop holder with three stops, a substage Abbe condenser with iris diaphragm (a later addition), and a freestanding bullseye condenser. The Wenham prism is housed in a blackened brass mount that fits in a slot located above the nosepiece. For use as a monocular instrument, the prism mount can be removed and replaced with a covering for the slot that lacks a prism.
While this microscope is unsigned by the maker, certain aspects of its design suggest that it is French-made. In particular, the lever-operated mechanical stage is of a type that is often associated with French microscopes and is rarely, if ever, seen on microscopes made elsewhere.
A number of microscopes in this collection have a similar type of mechanical stage and each of them are French imports. For example, look here, here, and here.
In the 1870 catalog of James W. Queen & Co., there is a microscope that appears to be a monocular version of the microscope shown on this page; it is referred to as Queen's Large Family Microscope. It and many of the other microscopes in the catalog are also French imports.
