Carl Zeiss AG
In 1902 the ultramicroscope was developed by Richard Adolf Zsigmondy (1865–1929) and Henry Siedentopf, working for Carl Zeiss AG. The ultramicroscope was suitable for the determination of small particles and became the most important instrument of colloid research in colloid chemistry. In 1925, Zsigmondy received the Nobel Prize for Chemistry also for this work.