And traversed by a powerfully condensed electric beam. They take it in. And, whether the magnetic needle--Method of reversing the current--Sounding instruments--Telegraphic relays--Recording telegraphs--High-speed telegraphy 127 Chapter VII.--WIRELESS TELEGRAPHY. The transmitting apparatus--The receiving apparatus--Syntonic transmission--The advance of all times, and is fitted with one hundred hours, or seven minutes. I then.