The following was extracted from the 1889 Watson & Sons catalog:
No. 3
JACKSON MODEL MICROSCOPE STAND
WITH NEW FINE ADJUSTMENT.
Compact Binocular Stand of the very highest quality and finest workmanship,
having rack work adjustment to focus, and Watson & Sons’ improved fine
adjustment, which is perfectly free from lateral motion even when working
with the highest powers, rackwork adjustment to draw tubes, mechanical
and rotary movements to stage, tube fitting under stage for illuminating
apparatus, wheel of diaphragms, extra large double mirror on an arm jointed
immediately below the stage to allow of obtaining very oblique light.
This Instrument is of extreme solidity and of most convenient size, it
can be strongly recommended to anybody requiring one for constant use;
with 1 pair of eye-pieces ··· ··· £10 10s.
A similar Instrument, Monocular, with 1 eye-piece ··· £8.
The above Instrument may also be supplied having a concentric rotating glass stage with universal motions instead of the one quoted at same price.
On the basis of the serial number, this microscope dates c. 1889. While in the 1889 Watson & Sons catalog this microscope
was referred to as the Jackson Model No. 3 with New Fine Adjustment, it was called the Jackson Model No. 6 in the 1884 catalog. In the
1896 catalog, this model was renamed the Research Microscope.
It was available with monocular or binocular tubes and with or without a mechanical stage.
The microscope is furnished with a single eyepiece, three objectives, an analyzing prism
which mounts above the objective, a sub-stage polarizer, a sub-stage aperture wheel,
and a double objective changer. It measures 16-inches in height when set up for use inclined
as shown in the photos.
An earlier example of the Jackson Model No. 2 from 1880 is also in this collection.
A short history of the Watson firm is online