This large monocular mineralogical microscope from W. Watson & son was manufactured under No. 14,616. Like all devices manufactured for this purpose, they have a special condenser. Its focusing system consists of a coarse screw that acts on a rack in the optical tube. It also includes a large horizontal wheel located on the axis of the device, which is the micrometric. It has a square stage with two axes of movement using large horizontal screws. The optical components of this large microscope are made of brass and blued steel supports. It has one foot with three supports. The manufacturer was established at 313 High Holborn Street in London.
