Ultramicroscope

The ultramicroscope worked by sending a beam of light through a colloidal solution and viewing the light scattered at right angles to the beam through a microscope. This allowed people to view colloidal particles which were invisible to ordinary microscopes.
 Richard Adolf Zsigmondy Germany 1902 Ultramicroscope

The ultramicroscope worked by sending a beam of light through a colloidal solution and viewing the light scattered at right angles to the beam through a microscope. This allowed people to view colloidal particles which were invisible to ordinary microscopes.