A contained volume of vacuum, air or other fluid that is sympathetic to some outside and disconnected note, tone, sound source or chord. Each such contained volume (interior of a hollow sphere or guitar body for instance) has its own keynote and chord. Also known as Cavity Resonator.
"Differential molecular volume is required to equate differentiation of sympathetic flows. This condition is satisfied by the Trexar. Two differing molecular densities, represented by two different mediums, make possible the harmonious adjustment of the thirds." [TREXAR - Snell]
"light and heat, considered theoretically, belong to the highest orders of the phenomenal. They can only be accounted for by the velocity of sympathetic streams, as interchangeable to and from centres of negative and attractive focalization. In considering the velocity of vibration, as associated with the projection of a ray of light, to be at least one hundred thousand billions per second, it is easy to account for the origin and demonstration of these two elements by the action of celestial sympathetic streams.
1st. Light and heat are not evolved until the force of the vibratory sympathetic stream, from the neutral center of the sun, comes into atomic percussive action against the molecular atmosphere or envelope of our planet. The visibility of the planets can only be accounted for in this way, some in a great degree, some in less. Innumerable thousands, it may be, remain invisible to us by not having the conditions surrounding them, and associated with them, which favour the atomic and molecular antagonistic friction necessary to make them visible. The velocity of a steel ball passing through the atmospheric envelope, at a speed of thousands of billions times less than an etheric sympathetic stream, would be dissipated into vapour in an indefinite period of a second of time. Light and heat, in a certain sense, are one and the same; light giving heat, and heat giving light. The whole mystery, as associated with their evolution, is explained by the bombardment of the sympathetic etheric stream on the dense portion of the molecular, in seeking the sympathetic concordant neutral center of the planetary mass that surrounds the point of focalization.
"The positive and negative interchange of this true sympathetic stream keeps intact the magnetic force of the polar envelope of the earth; making it, as it were, a great magnet of itself. The fact of this magnetic force being universally present, on and in our planet, proves the immensurable speed and power of etheric sympathetic interchange. Thus it is that, from the velocity of these sympathetic rays, the earth's standard of heat and light is evolved and kept in balance. This interchange of sympathetic radiation, between the solar world and its system of planets, equates the sympathetic volume by the reception of the full amount expended on sympathetic distribution; thus showing the never-ending restoration of equilibrium by the same medium that disturbs it during intermittent sympathetic action. There are very many facts in vibratory physics which prove that the volume of heat, supposed by many to emanate from the sun, if concentrated upon a centre of the volume represented by the sun, would give enough focal force, if projected upon the system of planets that is under its control, to vaporize then in one month's time. A ray of heat one billion times greater than the whole volume of the sun represents could not pass through the dark vacuous boundaries which lie between us and the sun without being neutralized and absorbed." [Vibratory Physics - The Connecting Link between Mind and Matter]