Barry's powers were far superior to Jay's. Jay basically ran fast, and that was about it. And when he DID run fast, the depictions of him in super-speed motion were shockingly static.
There were none of the after-images and trailing lightning bolts introduced by Carmine Infantino.
Barry, on the other hand, was said to have "control of every molecule in his body."
Barry could vibrate fast enough to pass through solid objects. He could literally run faster than lightning -- faster than 186, 234 miles per second!
The man behind the psuedo-science was none other than Julie Schwartz
, the science-fiction loving editor who DC hired to modernize the Flash.
Pictured below is a FLASH pin-up by Carmine Infantino
and Murphy Anderson.