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Rack Barrel and Compass Microscope

preview image for Rack Barrel and Compass Microscope
Inventory Number: 35509
Object Type: microscope
Place Created: England United Kingdom Europe
Subject Classification(s): Microscopy  
Accession Number:
Brief Description: The brass rack barrel consists of a number of brass cylinders. An external cylinder has a threaded hole to take an eyecup at one end. A second, internal cylinder slides within the first and can be positioned for focusing by means of a rack and pinion mechanism, operated by a milled edged knob. Near the eyecup mounting is a shaped slot, through which a brass slide carrying objectives lenses can be slid. The stage consists of two circular plates with central holes. A third internal cylinder on a steel spring pushes the plates together. The second stage plate has a groove on the upper surface to accommodate phials and a dovetail slot which can take one of three condenser lenses in brass slides. At the end of the rack barrel is a large condenser lens. The compass microscope consists of a brass arm to the end of which an ivory handle may be screwed. At the other end is a brass ring with an internal thread. Near the handle is a compass joint which carries the mounting for stage forceps on a steel pin. There is an objective lens that fits the compass microscope, two blackened brass eyecups with no lenses, three condenser lenses in brass slides, a slide with six objective lenses and an ivory talc box. The case is softwood covered in black fishskin and lined with green velvet.
Primary Inscriptions: 1914 written inside the box in pencil Paper inside the case has Adams Wilson 1780 hand written in ink
Provenance: Purchased from Dr. Reginald S. Clay with his collection
Collection Group:
Material(s): Brass
Height Width Depth Diameter Unit
87 44 mm

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