Page:CunninghamExtension.djvu/16

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92
[Feb. 11,
Mr. E. Cunningham

The velocity of a moving point

(2')

where is the velocity in any direction perpendicular to R.

The relative velocity of two moving points

(4')

The distance between two points (r, t), (r', t') at the time T corresponding to (r, t),

(3')

The element of volume

(5')

The density of free electricity

(6')

The current density

(7')

The polarization

(8')