I cannot quote a reference,  but I read Nobel, like Oliver Winchester was "haunted" by the dead caused by mis-use (and, in Winchester's case, the Proper Use-!) of their inventions. All the ghosts of those  killed in accidents handling nitroglycerin bothered Nobel so, that he had consulted a medium. She said he must donate his fortune to the good of mankind to find peace in the afterlife. A similar story is told about Winchester's widow, Sarah Winchester. She was haunted by ghosts of Oliver's inventions, consulted a medium, and was told noise would keep the spirits quiet. So, she had her house in San Jose. CA,  constantly added-on too, in hope the pounding would temporarily silence the vengeful spirits. This "Winchester Mystery House" is open to the public. Rooms and doors go nowhere, etc. One wonders if Krupps, Maxim, Gatling, Browning,DuPont,  etc, had similar stories?