Petrological Compound Microscope in Case, by Ross, London, c. 1875-1900
|Inventory Number:|| 54122|
|Object Type:|| microscope|
|Date Created:||fourth quarter 19th century|
|Place Created:|| London England United Kingdom Europe
|Brief Description:||The instrument is blackened brass and stands on a flat tripod foot singed by the manufacturer. Two of the feet are hinged and can pivot towards each other when the microscope is stored. The limb stands on trunions with a tightening lever to hold it in position an arm with a rack and pinion supports the body and two mill-edged knobs operate the coarse focus. Fine focusing is achieved by a knob on at the top of the limb. The mechanical stage is circular and two screws adjust the position of the stage plate. A bar is set across the stage to support specimens. Below the stage is a dovetail groove with a pinion mechanism to take a condenser. A cylindrical post extends below this and holds a pivoting arm with a plano-concave mirror. |
The accessories are a brass plate with live box, a condenser, five eyepieces, a nose piece, an objective, in a can, that fits the nosepiece and one objective that screws directly onto the body, and empty objective can, two conical compound condensers, a camera lucida, a Sorby parabolic top illuminator in a brass container and a Nicol polarimeter on a circular plate with a magnifying eyepiece to read the scale. The case is mahogany and has a fitted tin box with papers.
|Primary Inscriptions:||"ROSS, LONDON. 5216" .
Objectives signed (1) "1.in W. Ladd 11 Beak St. Regent St. W."
(2) "2/3 R & J Beck 31 Cornhill London"|
|Provenance:||Transfer from Dept of Geology & Mineralogy, Oxford University.|
There are no associated narratives.