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"The object of this invention is to produce electrically charged particles in a partial vacuum by means of impact with particles which are themselves charged with electricity, and to employ this for useful purposes hereinafter more particularly pointed out. I accomplish the object of my invention by causing a stream of particles which are charged with electricity to travel in a limited space by means of a suitable electrostatic or electromagnetic field, or a combination of these, and causing these charged particles to strike molecules of gas or vapor and render them charged with electricity."
electricity, charged particles, electrically charged particles, electromagnetic fields, electrical engineering
Goddard, Robert, "Method of and Means for Producing Electrically-Charged Particles" (1915). WPI Patents Collection. 24.