ore than ten feet from the speaker. In
broadcasting a play from a theatre, when the speakers are moving
about, the only way of dealing with the problem is to use several
microphones and a mixing device which enables the engineer to change
silently from one microphone to another, or to combine them in varying
proportions. Some rapid switching may sometimes be necessary.

"Even with good microphones and amplifiers the engineer in the
field may often experience difficulties with the lines connecting the
outside point to the studio. The majority of such lines do not
transmit the higher frequencies adequately, especially the longer
ones. The problems become immense when European simultaneous
broadcasts are attempted. Experiments on the continental wireless
link have done no more than reveal its unreliability. The undersea
telephone line, however, does not give either good or even intelligible
quality of speech if it is longer than a couple of hundred miles, and
it is quite unusable for the transmission of a musical programme.

"The B.B.C. has been the first in the world to exploit
Simultaneous Broadcasting to its fullest advantage for a national
system, and thanks to the co-operation of the Post Office engineers,
it is possible to pick up a programme wherever it may take place
within the British Isles and radiate it simultaneously from all
distribution centres.

"Looking ahead still further and assuming that the wireless will
supplement the wire line link, there is no reason why a simultaneous
broadcast of something of fundamental importance to the whole
civilised world should not take place some time in the future."

In a book entitled "Radio Goes to War" published by Faber & Faber
in 1943, Charles J. Rolo wrote,

"Radio went to war on five continents shortly after the Nazi
Party came to power in Germany. In nine years it has been streamlined
from a crude propaganda bludgeon into the most powerful single
instrument of political warfare the world has ever known. Spreading
with the speed of light, it carries the human voice seven times round
the globe in one second. When Hitler makes a speech in the Kroll
Opera House in Berlin, listeners in America and the whole world hear
his words by short wave even before his own immediate audience hears
them. Radio speaks in all tongues to all classes. All pervasive, it
penetrates beyond national frontiers, spans the walls of censorship
that bar