Nachet large compound microscope
Date: circa 1862
Inventory Number: 1068a
Classification: Microscope
Dimensions:microscope: 37.5 × 11 × 16 cm (14 3/4 × 4 5/16 × 6 5/16 in.)
case: 15.3 × 36.5 × 23.5 cm (6 × 14 3/8 × 9 1/4 in.)
Accessories: 9 objectives and caps 0, 1, 2, 3, 4, 5, 6, 7, 8, (last 3 marked "Nachet à Paris") in their own box; 3 eyepieces 1, 2, 3; large stage clips; dual nosepiece; camera lucida; side illumination prism ; substage cup diaphragm; substage condensers (3); rotating wheel diaphragm; substage mirror on articulated arm; wrench; convertible objectives (3) for a different microscope; flat case.
DescriptionThis microscope is very corroded and cannot be dismantled for storing in its original box. Therefore, the microscope has been assigned 1068a; the box and accessories, 1068b.
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1068a:
The Nachet microscope has a horseshoe-shaped base with a long heel. The base is brass, weighted with lead, and darkened on its upper surface. The stand consists of two round pillars topped with an inclining joint. This joint is attached to the stage, and the stage carries the upper part of the microscope.
The tube is carried in a sleeve attached by a ring mount to a bracket attached by rack and pinion to the main post of the microscope. This post is fixed to the back of the stage and inclines with the stage. The upper part of the tube has a special attachment topped by a micrometer eyepiece. A screw attached to the bracket for this slot focuses the micrometer. A screw in the section of the tube below this locks the micrometer orientation as desired. There is a revolving dual nosepiece. Coarse focus is by sliding the tube. Fine focus is by the rack and pinion on the post. Eyepiece no. 1 is inserted in the tube. There is no objective attached.
The round stage has a black glass insert on a mechanical platform that moves in the x direction by means of a screw and rotates by means of a knurled wheel. There are 2 stage clips.
There is a substage ring mount for a condenser or cup diaphrams, with a diaphram wheel below this. Both can be raised and lowered by means of a lever below the stage. The substage mirror is plano-concave and held in an octagonal brass frame. It has a knurled screw for adjusting its angle. The mirror is fork-mounted on an articulated arm below the stage.