As suggested, the theory of the mechanical device is to determine not only the aura of individuals but to use same in the diagnoses of disorders in various portions of the body.
As is known, the body in action - or a live body - emanates from same the vibrations to which it as a body is vibrating, both physical and spiritual. Just as there is an aura when a string of a musical instrument is vibrated - the tone is produced by the vibration. In the body the tone is given off rather in the higher vibration, or the color. Hence this is a condition that exists with each physical body. In the material things we find that to tone, or to find a tone or the color to the eye, only three colors are necessary to make, for the perfecting of the various shades or tones that may be had in ANY vibration. In any print in nature itself we find these are existent. Hence these set with the absence of color, or with the crystal, in their rotation so that they are turned (by the hand, preferably), being on the same spindle or same manner so that when one turns the other turns also. With these changings of the color there soon sets those vibrations by the beholder, in its active force of beholding or discerning the variations, so that there is set in a practical manner the aura ABOUT the body. To be sure, as indicated, it will necessitate the developing of the psychic forces. [440-6]