Martin (Nikola Tesla's Night of Terror)
From Tardis Wiki, the free Doctor Who reference
Mr Martin was a potential investor for Nikola Tesla.
In 1903, he attended Tesla's presentation at Niagara Generator. Mr Martin was confused by the idea that energy could be transmitted through the ether, asking Tesla whether that meant that energy was supposed to be "flying around in the air". (TV: Nikola Tesla's Night of Terror)