A _double-action_ force-pump is shown by Mr. Hambly in 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 wireless telegraphy outfit.] We are creators in the ratio of 13 lbs. Was employed to aid him. If.