A faster way to send messages with a telegraph
Contenuto
-
Titolo
-
A faster way to send messages with a telegraph
-
Article Title and/or Image Caption
-
Making the Wireless Talk Faster
-
caption 1: By means of multiplex
radio. telegraphy, sev-
eral different messages
may be sent and receiv-
ed at the same time.
Perforating each mes-
sage on a roll of oil-
paper tape constitutes
the initial operation
caption 2: The perforations are a series of
dots in double rows. Each series.
represents a letter of the alpha-
bet. An electric motor feeds the
tape through the “transmitter,”
‘where metal fingers feel the tape
and pass through such holes as
they find to make electric con-
tacts, closing the radio. circuit
faster than could be done by hand
caption 3: Besides the wansmitter, the operator
has a standard receiving outfit. Four
or more of them are connected with a
receiving aerial separate from the one
used for transmitting. By manipulat-
ing the knobs on the receivers, cach
man can select a different message
caption 4: President Wilson used the multi-
plex system on his voyage to France.
Secretary Daniels is here shown
preparing a message to Admiral Sims
caption 5: The four multiplex equipments
shown above are in the Navy De-
partment at Washington, D. C.
They sometimes send out two
hundred words a minute. While
flashed from one aerial, the mes-
sages are “tuned” differently
-
Autore secondario
-
International Film Service (Image copyright)
-
Lingua
-
eng
-
Data di rilascio
-
1919-04
-
pagine
-
63
-
Diritti
-
Public domain (Google digitized)
-
Archived by
-
Davide Donà
-
Marco Bortolami (editor)
