Electric field apparatus rvfm 52 2660 this apparatus is ideal for demonstrating electric fields between various electrodes liquid paraffin is placed in the 90mm diameter petri dish and semolina or fine grass seed is sprinkled on the surface various electrode configurations can be arranged in the liquid and when a high voltage is applied via the 4mm terminals the field pattern is generated the see through base allows the pattern to be projected via an overhead projector system rvfm e field