The Bennington evening banner. (Bennington, Vt.) 19??-1961, 1919-06-09
RADIO MESSAGES
PRINTED ON TAPE
New Photographic Device En-
ables Operator to See Dots
and Dashes.
GUARDS AGAINST ERRORS
Givea Receiving Speed of 400 Words a
Minute and Makes Permanent
Record = Based on Simple
Electrical Engineering
Principles.

Observation-Disclosures messages can
be received and recorded at far
greater speed and with further assur-
ance Of accuracy as result of new
Photographic device now being used
by naval engineers at Otter Cliffs,
near Bar Harbor, Me. The instru-
ment is the invention Of Charles A.
Hoxie of this city.
The invention permits the eye to
supplement or replace the ear in read
ing wireless messages. In fact, deaf
man could be wireless receiving OBJ
orator in station so equipped.
Other results are greater speed In
receiving. greater accuracy In decipher-
Ing. and a permanent record of every
dot and dash in every message so re-
ceived. Because of the very delicate
tuning that can be obtained and the
resulting high degree of "seIectiylty."
It has been found practicable to re.
ceive messages despite many lnductiye
noises and interfering signals, which
ordinarily have rendered reception I'M
possible. Although the instrument is
not immune from the effects Of static
"strays." 1t has successfully recorded
messages at high speed regardless OF
strong static interferences that. with
out Its aid. would have bafIied the re-
ceivlng operator.
Guards Against Error.
II Is stated that messages have been
deciphered with It's assistance when
operators were unable to get single
word OF II by ear alone.
'The Photographic receiver and its
permanent record Is guard against
error and win settle disputes for Its
visual record of message In dots and
! dashes distinctly shows to the eye
what was received.
AS TO speed In receiving. this ma
chine has frequently recorded at the
rate Of 400 words per minute. Gas fast
as machine sunisshoots). and last
week In testcmadeby Mr.. Hoxie the
machine recorded aie@lpower message
at GOO words per mlnntel Up to this
time ttSa MOST rqhid,' .4]}Hth6d Of record
nf,radlo signals has, beGHby The nhon
osFaph. but ibis dnNst still bR tran
seribed by the ear and not the eye.
Moreover, no permanent visual record
is made. The photographic method
has never yet approached the rate Of
COO words per minute, so the new In
strumcnt hns hung up a new speed
record. An interesting sldellght on
this feature Of the invention Is that
high-speed messages are secret mes
sages to all who are not equipped with
this device.
Forty to FIfty.FNe Words a Minute.
Expert operators have been known
to receive So words per illnute for
a short time under perfect conditions:
bur average reception up to this time
has been Is TO 20 words per minute.
or 1000 words per hour.
II has been n race between sending
end receiving speeds. Prior to this In
ventlon It has heen possible to send
faster than It could be received; hut
now the situation has been reversed
The Photographic recorder IN oper-
alton at Bar Harbor has repeatedly re.
corded regular traffic schedules rang
Ing from 1000 to 1000 words without
interruption, and at speed OF 40 to
So words per minute. Every word Is
perfect and easily and quickly read
II is used supplementary to the ordI-
nary type of receiving set.
The mechanism is based on compara-
lively simple electrical engineering
principles. lightweight mirror ''flut-
tcrs" in electromagnetic tune with the
minute electric impulses coming from
the receiving antenna. The duration
ord extent Of the mirrors oscillation
vory according TO the dot dash. or ST.
leDce OF the sending station. This mir
ror reflects beam OF light on the
moving sensltised inpe This tape
/ lANBtitNh ny tll. 'tNNtiit tiOltf IIO-
crosses up and down through the verti-
cal pipes which contain the develop
Ing and fixing chemicals. Automotl-
cnlly the tape enters the developing
auid and then the hypo fixing bath;
then II is washed In cunning wasar and
is dried by electric heat assisted by
forced draft-all invislbly effected In.
side this single machine. Like the
tape from q stock ticker. the message
pours out into basket In rapid re-
ceiving there is an average OF one
word for every inch Of tape. The re-
ceiving operators can read the record
at n speed OF 80 to 100 words per
minute.
The time TO record, develop, Ak,
wash, and dry the tape Is from two to
four minutes, The rolls Of tape IRE
1000 feet long and continuous mes
sage OF 10000 words can be recorded
without reloading the machine.
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