  This presentation reports the first known data from a field mill mounted on a
ground-based robotic platform. The robot's motor and electrostatic charging of
its wheels do not perturb the field mill data, and electric field varies
smoothly whilst the robot is moving. Test measurements under a charged
polystyrene plate are reduced in variability by a factor of 2 compared to a
hand-held field mill. This technology has potential for autonomous measurements
in inaccessible or hazardous environments.
