not a big fan of edison
i think he stole more ideas than he originated - lol
he did, however, invent the light bulb and the cylindrical phonograph
the cylinders may have done better, but he wouldn't sell any rag-time music - only conservative music
with disks, you could get the music you wanted to hear, so they caught on
they probably would have taken over eventually, anyways, because they were easier to store and handle
but cylinders do offer a slight technical advantage in that the track has constant length
another guy, DeForest, added the control grid to the Fleming Valve
that is what really made tubes do something
before that, they were just rectifiers
with a control grid, they could be used to amplify - a big step
Brits still call them "valves", though :P
at the turn of the century, there was a lot of patent grabbing going on, with regard to electrical discovery
also - a lot of mud-slinging - anything to discredit the opposition