He established his firm in 1839. He won a Prize Medal at the Great Exhibition of 1851 for the quality of workmanship of his microscopes. The instrument has a solid brass base that supports the short tubal pillar. The limb carries the stage and a body-tube with an objective nose cone.Coarse focusing is by draw tube with fine focusing at the top of the pillar. Has a bulls eye condenser fitted at the front of the microscope. There is a dove tail underneath the stage with two sliding diaphragm tubes. Suspended from the underside of the stage is a one-sided adjustable mirror. It comes with its original hand dovetailed wooden carrying case, including key, with good functioning lock.
Has 3 eyepiece lenses (marked 1, 2 and 3) Has 3 objective lenses. One is unmarked, the other two have a 3 and a 5 stamped to their sides.This instrument is similar to the microscope used by Pasteur in his work on the diseases of silkworms. Microscope is 27cms tall with no extension to tubes. Dimensions of box: 27.5cm x 15cm x 10.3cm Boxed weight: 3.3kgs (Heavy item to securely P+P).
Condition: All lenses have been cleaned and appear to my eyes to be fine. There are no cracks damage or fungus to any elements. The lens combinations all work well but. Objective 5 (with 4 separate screw lens elements). As set up, does not have a viable focal length.
If the second element (from the top) is removed then a good focus can be obtained. I have not checked combinations and permutations of lens elements. I would describe this as a museum quality instrument in exceptional condition for its age.The item "Nachet et Fils, Paris Brass Microscope c1856 (Louis Pasteur)" is in sale since Thursday, August 5, 2021. This item is in the category "Antiques\Science/Medicine\Scientific Instruments".
The seller is "nigel315" and is located in St Boswells, Melrose, Borders. This item can be shipped worldwide.