The sliding panel must first be removed in order to permit light to enter into the box and reflect from the mirror surface. This light is then directed upwards through an aperture that perforates the center of the top of the box. The body tube is centered over the opening and is secured to a rectangular pillar by a fixed arm. Positioned between the aperture and the body tube is the stage frame that balances on finely turned pegs. Optical fittings in the body tube include a single eye lens and a field lens.
Fine adjustment is achieved by manipulating a Cuff-type screw to lower or raise the body tube.
The lower portion of the box features a pullout drawer and is designed to contain auxiliary objectives, forceps, and a fishplate. Similar instruments were crafted in Italy and France between 1750 and 1780. All Rights Reserved . No images, graphics, scripts, or applets may be reproduced or used in any manner without permission from the copyright holders.