Carl Zeiss was born in 1816 and in 1846 he established his first business in Jena. The following year he was already selling his own models. In 1866, 200 employees worked with him and he sold the 1,000th copy. This year he contacts Ernst Abbe, who develops great innovations and new techniques for optics and becomes his partner in 1875. In 1888 Zeiss dies, but his company It continues directed by Abbe manufacturing magnificent microscopes, which reach their maximum prestige around 1900, at which time the company has more than 1000 employees.
Extraordinary brass microscope made in 1886 based on model I in an excellent state of preservation. It has the number 9100 and it has the particularity that the platform can rotate on its axis dragging the main tube. Beneath it there is a very complete accessory with light regulator, diaphragm-iris and filter holder, also with the possibility of lateral micrometric displacement. The set contains 5 original eyepieces, as well as 6 objectives from the manufacturer (a*, B, DD, E, F and 1/12 oil immersion), some of them very rare and with collar correction. It also has other important accessories such as a micrometer to place on the platform, a camera lucida, as well as different types of light limiters. It has the peculiarity of having 2 independent sets to place under the observation platform, with their corresponding mirrors.
References: "Microscopes and Microscopical Instruments", C. Zeiss 1889
H. Moe, "The Story of the Microscopes", pag 220-236