Many changes introduced to the mechanical parts of this microscope allowed to his maker to call it, with reason, "Universele". It can be disposed in horizontal, vertical or inclined and can be used for all the requiremnts due to observations; in many cases a horizontal placement is better than a vertical one. Following Chevalier's words: “Lorsque l'on a besoin de faire des observations prolongées avec le microscope vertical, on ne tarde pas a sentir un engourdissement douloureux dans les muscles posterieurs du cou; on est obligé de suspendre frequemment l'experience et chaque fois la douleur revient avec plus de rapidité... Avec le microscope horizontal, au contraire, le coprs reste parfaitement droit ... Du reste, l'application des meilleures chambres claires et de certains procédés micrométriques exige la position horizontale du savant Amici, et des plus experiences chimiques sont d'une extreme facilité lorsque le microscope est dans cette positions. »

Portable Microscope (Le microscope diamant ou de poche)
Developed by Charles Chevalier in 1834, it could be stored in a bag (" poche "), a very useful characteristic for the physicians of the time, when the microscopical observations were done nearby their patients. Of it, Chevalier writes in Manuel de micrographie, 1839: "Je saisirai l'occasion pour dire un mot d'un petit microscope que je nommerai volentiers diamant. Cet instrument, dont tous les verres sont achromatiques, n'a pas plus de quatre centimetres de longueur; il m'a fait voir nettement plusiers test-objets."

The development of photography
Charles Chevalier played an important role in the field of photography, he gave with his skill a contribution to its development. He provided achromatic objectives not only to microscopes, but also to the first daguerreotypes. The first lasting pictures were done in 1813 by Niepce and in 1839 by Daguerre, with whom Chevalier cooperated, but they were only positive ones and was not possible their duplication. The negative-positive process was developed only in 1840 by Fox-Talbot.