Simplified scheme of Millikan's oil-drop experiment
This apparatus has a parallel pair of horizontal metal plates. A uniform electric field is created between them. The ring has three holes for illumination and one for viewing through a microscope. Special oil for vacuum apparatus is sprayed into the chamber, where drops become electrically charged. The droplets enter the space between the plates and can be controlled by changing the voltage across the plates.
Source
Boundless vets and curates high-quality, openly licensed content from around the Internet. This particular resource used the following sources:
"Simplified scheme of Millikan's oil-drop experiment."
http://en.wikipedia.org/wiki/File:Simplified_scheme_of_Millikan%E2%80%99s_oil-drop_experiment.png
Wikipedia
CC BY-SA.
