Evening star., 1922-10-08
TYPEWRITER OPERATED &
FROM SEAPLANE in FLIGHT
Remarkable Demonstration by Navy's Aeronautical
Radio Service Points to the Possibility of Radio.
Typists on Aircraft of the Future.

For radio reception, or printing.
the radio receiving antenna and re-
ceiving equipment circuits are as
sociated. through an extremely SEN
sitive relay, with the circuits of the
magnet coils for actuating the arma-
selective mechanism, which In turn
prints on a moving paper tape the
characters corresponding to the ra-
dio impulses transmitted.
The reception and printing of mes
sages is entirely automatic. No per-
sonnel is required for this purpose.
other than to keep the teletype and
radio apparatus In proper adjustment.
Skilled Operators Not Needed.
Radio operators are not required
for transmitting, as knowledge of
the telegraph code Is not necessary.
Any one who can manipulate type
writer keyboard can transmit mes
sages, and virtually everybody can
do that. although with varying de-
grees Of efficiency and speed.
The characters transmitted are
automatically printed on paper tape
associated with the keyboard as they
are sent out into space by radio.
Thus a permanent record of the actual
sending of a message is retained as
well as its reception at a distant
station.
The ether waves. or groups OF
waves. corresponding to the charac
ters transmitted do not conform to
existing telegraphic codes. The sig
nails therefore cannot be translated
by ear by a radio receiving operator,
and the system may be regarded as
secret in this sense.
The letter "A" on the keyboard OF
the transmitter may be said to have
an affinity" through the medium OF
the characteristic ether wave trans
mitted for the corresponding letter
a on the type wheel of the printer
! at the distant receiving station. The
same applies to the letters B. {. and
so on. likewise the figures /. .. 2
and the various characters provided
FOR on the keyboard and type wheel
A teletype associated with radio
receiving apparatus must be utilized
to intellfgently record radio signals
sent out into space by d teletype as
sociated with radio transmitting ap-
paratus.
Both installations must be in
electro mechanical resonance with
! one another.
Possibility Of Development.
II this newcomer in radio is eveutu-
ally developed to the stage where il
will be reliable and satisfactory 10
handle traffic over long distances il
should provide an effective method
for confidential or secret communica
commercial use.
Different wave lengths may be used
| for transmitting. Only teletype
will intelligently record the inconGns
signals The lettered caps of the
transnitter keyboard may be re-
arranged quickly. with prearranged
; corresponding changes of the type
wheel at the distant receiving
station. therby making recorded sig
nails even on teletype unintellieib BILE
unless the tranSmitter keyboard ar
rangement is known.
The Navy radio has been expert
mentine with the application of the
year. Complete teletype equipment
has been loaned to the government
without cost by the Mork rum Com
pany OF Chicago which controls this
equipment, for this purpose.
The signals recorded at Anacostia
in the experiment described were
brought in on the ordinary overhead
loop antenna. The seaplane was in
the air for something over two hours,
during which time practically un-
interrupted communica ton was main
tanned with Anacostia up to distances
of nifty miles. Judging by the
strength of signals received and the
functionins of the equipment, it is
| estimated that service would have
been satisfactory up to distances of
one hundred miles.
The more difficult experiment of
actually printing messages on a sea
plane in flight Is sent out by radio
from Anacostia will now be under
unit of light weight having been pro-
duCed by the manufacturers and
turned over to the Navy for this
purpose.