noun: a surface whose plane sections are all ellipses or circles ("The Earth is an **ellipsoid**")

adjective: in the form of an ellipse

**James Clerk Maxwell**

"9 coefficients determine the relationship between flux and intensity

6 of these coefficients form 3 pairs of equal quantities

3 pairs of equal coefficients will self-conjugate." [James Clerk Maxwell]

The original quote from "https://svpwiki.com/pdffiles/A_Treatise_on_Electricity_and_Magnetism.pdf - vol. I".

"The case in which the components of the flux are linear functions of those of the force is discussed in the chapter on the Equations of Conduction, Art. 296. There are in general nine coefficients which determine the relation between the force and the flux. In certain cases we have reason to believe that six of these coefficients form three pairs of equal quantities. In such cases the relation between the line of direction of the force and the normal plane of the flux is of the same kind as that between a diameter of an **ellipsoid** and its conjugate diametral plane. In Quaternion language, the one vector is said to be a linear and vector function of the other, and when there are three pairs of equal coefficients the function is said to be self-conjugate." [James Maxwell, A Treatise on Electricity and Magnetism - vol. I]

See Also

**Apogee**
**Apsidal**
**eccentric orbit**
**9.24 - Elliptical Enharmonic Orbit**
**ellipse**
**ellipsoid**
**elliptic**
**elliptical orbit**
**spiral-ellipse**
**theory of elliptic functions**
**Equator**
**Fathom**
**Figure 9.7 - Two Centers Showing Complex Attraction Dynamics**
**Latitude**
**Longitude**
**Meridian Arc**
**off-center flywheel**
**Orbital Plane**
**Perigee**
**Prolate**
**Quantum Arithmetic Elements**
**Quantum Arithmetic**
**Sphere**
**two centers**
**two controlling points of stillness**
**two dividing poles**
**two lights of the spectrum**
**two opposed electric forces**
**two points of stillness**
**two poles**
**two-way compression-expansion sequence**
**two-way divided effects of motion**
**two-way effect**
**two-way extension of a point in space**
**two-way motion**
**two-way opening and closing universe**
**two-way universe**
**12.38 - Orbital revolution**
**9.23 - Circular Harmonic Orbit**
**9.24 - Elliptical Enharmonic Orbit**