-that Ampère-Schrader Law seems to disprove existence of classical aether by having constant speed of light, results in growing speculation about what this means
-over next decade Karl Anton Schrader ponders on light being constant speed everywhere and what this means about frames of references
-thought experiment of train at near-speed of light, lamps turned on at same time
-and Galilean transformations yielding nonsense leads him to ponder own theory of invariance
-experiment to measure "aether wind" in 1900, has null result
-suddenly causes controversy, but does prove constant speed of light and Schrader concludes he is looking at right spot
-and Schrader also concludes aether is entirely motionless and constant in all directions
-also writes first form of "Schrader transformations" in 1901, publishes them
-inspired by work on [Doppler]effect, which though based on elastic theory of waves is still valid for electrodynamic notions
-was worked on prior to null result, but in its wake he removes all traces of aether from his work
-although he insists he simply made the aether superfluous under his model
-and thus comes up in 1903 with the two postulates of what we would call special relativity
-here they simply call it invariance theory with focus on speed of light, it is only with new theories in 1950s with rise of rocketry they come up with gravitational invariance and as a result are forced to call this "electrodynamic invariance theory" or "Schrader's invariance theory"
-and upon his death in 1907, secures Schrader's place as the greatest physicist since Newton
-although it takes c. 1920 for it to be fully accepted because aether is irrelevant to it