Electrogravitics is a research subject base upon the original work of Nikola Tesla, and hypotheses advanced by Thomas Townsend Brown. The term was in widespread use by 1956. The effects of electrogravity are more widely studied in electrohydrodynamics (EHD) or sometimes electro-fluid-dynamics, a counterpart to the well-known magneto-hydrodynamics. Electrokinetics is the term used by Brown for the electrically generated propulsive force. Fran De Aquino has published calculations explaining the cause and proper harnessing of the electrogravitic effect.