Maxwell's Equations

• Maxwell's Equations
  Courtesy of the HyperPhysics web site at Georgia State University

Wind patterns in San Francisco Bay

• velocity field of the wind
  Courtesy of SFPORTS

Gravitational vector field

• Gravitational vector field
  Courtesy of Professor Andrew Duffy, Boston University

Vector field for a dipole

• vector field of a dipole
  Demo stored at Davidson College webphysics site but written at Boston University by Professor Andrew Duffy (I think)