You should not credit him with anything. Just watched several videos of him electrocuting and killing dogs, horses and elephants in public so he could scare people away from Tesla's Alternating Current so he could keep his DC alive. If he would have had his way and we used DC today, your electric bill would be your most expensive bill. And the fucker was basically the Bill Gates of the time. Most of the shit he didn't invent, he bought out other people and developed their work. Extraordinary scumbag.