I hope someone here can help me and jog my memory. Some time back I was reading something on this forum which struck me as being a bit strange but nevertheless interesting. I made a mental note of coming back to the topic and taking a proper look at it But the trouble is I've forgotten the details and I can't find any references to it. It was related to changing electric field line patterns due to moving charges. I can remember that there were two names connected with theories associated with these changes but I can't remember the names of the people involved.. I seem to remember that one theory was more detailed than the other but that each theory had certain weaknesses. I have spent a lot of time searching but have come up with nothing. Thank you if you can help.