"Radiant heat" is that property of the element heat, after its liberation from corpuscular imprisonment, by means of which it reaches out for reabsorption and return to its sympathetic environment." [HEAT - Snell]
"Dark radiant heat begins at absolute zero temperature, and extends through light, chemical rays, actinic rays, and infra-violet rays, up to the dissociation of all molecules to the 63rd octave." [Law of Oscillating Atoms]
See Also
Determination of Size of Atom
Fire
Flame
Fraunhofer Lines
Heat
Infrared
Law of Atomic Dissociation
Law of Force
Law of Oscillating Atoms
Law of Transformation of Forces
Outreach
Rad-energy
Radiant Energy
Scale of the Forces in Octaves
12.30 - Thermal Radiation and Thermal Vacuum or Cold