Homage to Heinrich Hertz

“In his 1870 Presidential Address to the Mathematical and Physical Section of the British Association for the Advancement of Science, the great Clerk Maxwell spoke of, as an undecided question, whether electromagnetic phenomena are due to ‘direct action at a distance’ or ‘the action of an intervening medium’. The year, 1888, will ever be memorable as the year in which this great question has been experimentally decided by Hertz.” — Professor G.F. Fitzgerald, President, in 1888, of the Mathematical and Physical Section of the British Association for the Advancement of Science.