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We compare the nature of electromagnetic fields and of gravitational fieldsin linearized general relativity. We carry out this comparison bothmathematically and visually. In particular the "lines of force" visualizationsof electromagnetism are contrasted with the recently introduced tendex/vortexeigenline technique for visualizing gravitational fields. Specific solutions,visualizations, and comparisons are given for an oscillating point quadrupolesource. Among the similarities illustrated are the quasistatic nature of thenear fields, the transverse 1/r nature of the far fields, and the interestingintermediate field structures connecting these two limiting forms. Among thedifferences illustrated are the meaning of field line motion, and of the flowof energy.

Comparison of electromagnetic and gravitational radiation; what we can learn about each from the other