Sympathetic Vibratory Physics

Same as Compression Wave or Sound Wave. A wave incident or normal to a surface. One of many modes or dimensions of motion present in all vibrations and oscillations. Generally, considered as a motion to and from a center or source. When harmonic is considered syntropic and when enharmonic considered entropic.
"Vibration in which the principal motion is in the direction of the longest dimension." (Rossing, Thomas D.; The Science of Sound; Addison-Wesley Publishing Company, 1982.)
"A vibrating medium must lengthen and shorten 2 times per each lateral (transverse) oscillation; so 1 longitudinal equals 2 lateral or (transverse). Longitudinal frequencies are independent of string tension." (Tyndall, John; Sound; Longmans, Green, and Co., London, 1893.)

Longitudinal Axis
Triple axis of the three modes of vibration drawn to reference a circle and sphere.

The three modes working together develop rotation by and through each other's motion - the rotation is the Rayleigh Wave or Surface Wave mode. The first two modes cause (or are) straight line and zig-zag motions only. The third or Rayleigh Wave is circular.

Longitudinal Axis

(click to enlarge)

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