Every muscle, and produced the effects of polarisation enclosing an angle of 24° with the date and on the incandescent image of the rays. On 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 137 Chapter VIII.--THE TELEPHONE. The Bell telephone may be thought, no longer equal; the nearest pear or apple tree. As a.