In reply to Jürg Wyttenbach's message of Sat, 13 Jun 2020 00:27:41 +0200: Hi, [snip] >https://www.researchgate.net/post/Did_I_actually_measure_a_superluminous_signal_thus_disproving_the_relativity_theory
Tesla assumed that the signal went around the Earth. If one instead assumes a light speed signal through the Earth across the diameter, one gets the same result. I.e. (Pi x D) / 2D = Pi/2.