The blast left twisted conduit pipes littering the tunnel floor and tore up railroad tracks inside the corridor, with noxious smoke ... “the Black Edison”—and the gas mask he had patented ...

Because racial discrimination was rampant in the South, Morgan hired a white actor to demonstrate the device to cities and companies there. Once word got out that its inventor was black ...

The smoking video was posted to Tunsil's account at 7:47 p.m. ET Thursday. It begins with a man wearing a black gas mask with a plastic tube attached to the mouth. An unseen person holds a lighter ...