This unsigned, brass instrument is very similar to the "Improved Compound Microscope" shown in Adams' Essays on the Microscope (1787). The folding tripod base supports the round, tapered pillar. The round limb, attached to the pillar by a compass joint, holds the platform fitted with a spring stage and the arm, supporting the body-tube. A swinging mirror slides along the square-section bar attached to the limb. The instrument fits into a wooden case, and no accessories are present, except an ivory slider. It is possible that this is a German copy of the Adams model, as the construction of the box, lined with olive green woolen cloth and mahogany inlaids, appears different from the boxes of English instruments.