The apparatus enables electric field patterns to be shown in much the same way
that magnetic fields are demonstrated with iron fillings, either by direct viewing or on an overhead projector. The
apparatus
comprises a clear plastic dish 90 x 12mm dia x depth and base 140 x 125mm, which carries a pair of 4mm
socket
terminals/electrode holders. Alongside each terminals is a thumbscrew system, which permits fine height
adjustment of the
electrodes. Six electrodes are supplied, two point source 'two line source' and two circular and
two circular rings of 35
and 70mm dia. respectively.
