Harold Aspden: Discourse No. 4: The Heresy of the Aether Harold Aspden Einstein James Clerk Maxwell ether electromagnetic wave fluid space particle light propagation temperature thermodynamics second law of thermodynamics physics science gravity 1998 1934 1960 1993 OVERVIEW NO. 4 DISCOURSE NO. Read more about Harold Aspden: Discourse No. 4: The Heresy of the Aether