^ abElectrostatic Motors. Their History, Types, and Principles of Operation — With many illustrations, of which 57 are by David K. Walker of Waynesburg College. Oleg D. Jefimenko. West Virginia UniversityArkiveret 28. januar 2015 hos Wayback Machine Citat: "...[pdf-side 122 (papirside 98); kondensatormotor eksempel:]...FIGURE 47 In 1961, the Russian physicist A. N. Gubkin described this motor with two electrets in the rotor and two parallel-plate capacitors in the stator. A commutator was used to change the polarity of the capacitors...[pdf-side 131-141 (107-116)]...It appears that corona motors with input power of 100 to 1000 watts and efficiency of at least 60% can be constructed without any difficulty. There seems to be no reason why even more powerful corona motors could not be built. It is likely that the motors can be further improved by using rotors immersed in a gas other than the air at atmospheric pressure...Finally, a very interesting source for powering electrostatic motors is the atmospheric electric field..."
^The Earth's Atmosphere As a source for Electric Power. William Aston Citat: "...[pdf-side 4]...A modern version of the Poggendorff Corona motor utilizes a cylinder rotor instead of a disk. This particular motor was operated from charges of the earth's electric field. Dr. Jefimenko and Mr. Walker performed the experiment from the top of the Engineering Building using an antenna suspended from a baloon..."