Spectrum is a range of frequencies, usually related in some fashion, but not always. Spectrum usually refers to the spectrum or range of light frequencies.
"The names of these particles is of no import here, but the fact that one end of cobalt atoms ejects big particles, and the other ejects small particles, is important. Also, the statement that it was never known before that one end of an atom is different from the other end is also important for it is not true. It has been known as long as electricity has been known that each end of a polarized body is different, and all matter is polarized. Each end of a balanced atom - which means equally paired - will emit the same sized particles from each end, because polarized, or divided pairs, are male and female and belong to the red and blue sides of the spectrum. The important fact that has been overlooked is the fact that an unbalanced particle of matter cannot emit equal potentials from both ends. [Atomic Suicide, page 274-275]
"The master-tone of each octave is the inheritance of the original motion of the thinking process of Mind. These master-tones are the "inert gases" which are classified in the zero group of the Mendeleef table.
The state of motion of these inert gases is that of motion-in-inertia."
"Motion-in-inertia is that state of pressure equilibrium which lies between any two masses.
"The inertial line, or plane is that dividing line, or plane, toward which all masses discharge their potential.
"It is the line, or plane, of lowest potential of two opposing areas of potential, where opposing pressures neutralize. This is the plane of minimum pressure of two opposing areas.
"The master-tones which represent a state of motion-in-inertia and are the inert gases, bear the same relationship to the elements that white bears to the colors. They are a registration of them all. White is not included in the spectrum, it has no place there. The inert gases should not be included in the elements. They have no place there. Of this more shall be written later in its proper place." [Russell, The Universal One]
Part 08 - What Vibration Is. - Part 1
12.40 - Color