The Dayton forum. [volume] (Dayton, Ohio) 1913-1949, 1919-05-16
RADIO MESSAGES
PRINTED on TAPE :
New Photographic Device En-
ables Operator TO See Dots
and Daslaes.
GUARDS AGAINST ERRORS
0ises HeeslvinG Speed 81 400 Words
Minute and Makes q Permanent
Record Rased On Simple
Electrical Engineering
rrineIplsa


Schenectady Wireless messages can
be received and recorded st far
greater speed and with further asaur-
ance OF accuracy as result OF d new
Photographic device now being used
by naval engineers 1t Otter Cliffs,
near Bar Harbor, Me. The instru-
ment Is the inventlon Of Charles A.
Hoxie of this city.
The Invention permits this eye to
supplement or replace the ear In read
Ing wireless messages. In fact, deaf
man could be wireless receiving op-
orator In a station 30 equipped
Other results are greater speed In
receiving, greater accuracy In decipher-
Ing. and permanent record OF every
dot and dash In every message so re-
ceiyed. Because OF the very delicate
tuning that can be obtained and the
resulting high degree OF sseleetlvity."
II has been found practicable to re-
Ceive messages despite many inductiva
noises and interfering signals. which
ordinarily have rendered reception Inn
possible. Although the instrument Ii
not immune from the effects OF static
"strays." 1t has successfully recorded
messages at high speed regardless Of
strong static intsrferences that, with
our its aid. would have bafIfed the re-
ceiying operator.
Guards AGainss Error.
tu a+nxk ~ xsfkaxa@s rxau f.ax,n Eaa1.
I deciphered with its assistance when
operators were unable to get single
word Of IL by ear alone.
The Photographic receiver and Its
permanent record liz guard against
error and will settle disputes. for it's
visual record of message In dots and
dashes distinctly shows to the eye
i what was received.
AS TO speed In receiving, this ma
chine has frequently recorded of the
rate of 400 words per minute, las fast
as machine gun ahoots1. and last
week In a test made by Mr.. Hoxie the
machine recorded a low-power message
at 600 words per minute Up to this
time the most rapid method OK record
Ing radio signals has been by the phon-
ograph, but this must still be tran
scribed by the ear and not the eye.
Moreover, no permanent visual record
ID made. The photographic method
has never vet approached the rate Of
600 words per minute, so the new In
strument has hung up new speed
record. An interesting sidelight on
this feature of the invention is that
high-speed messages are secret mes.
sages to all who are not equipped with
thla device.
Forty TO Flfty.FIve Words Minute.
Expert operators have been known
10 receive 35 words per minute for
short time under perfect conditions
bnt average reception up to this time
has been 15 to 90 words per minute
or 1900 words per hour
1t has been race between sending
and receiving speeds. Prior TO this In
yention Ii has been possible to send
faster than II could be received; bui
now the situation has been reversed
The Photographic recorder In 0per
alton at Bar Harbor has repeatedly re
corded regular traffic schedules rang
ing from 1000 to 1900 words without
interruption, and at speed Of 40 ts
SIS words ger minute. Every word Il
perfect and easily and quickly read
1T Is used supplementary to the ordi
nary type Of receiving set.
! The mechanism is based on compare
lively simple electrical engineering
principles. A lightweight mirror "fiut
ters' In electromagnetic tune With Tn,
minute electric impulses coming from
the receiving antenna. The duration
and extent OF the mirrors oscillation
vary according to the dot, dash. or 81
lence of the sending station. This mir
ror reflects beam OF light on tn
I moving sensitized tape. This tape
propelled by an electric motor pro
crosses up and down through the VERT
cal pipes which contain the develop
Ing and fixing chemicals. Automati
: calIy the tape enters the deveIopin
! fluid and then the hypo Gxing bath
then 1t Is washed In running water an
lis dried by electric heat assisted b
I forced draft--all invisibly effected IL
side this single machine. Like til
tape from stock ticker, the messag
pours out Into basket. In rapid "a
ceiying there liz an average of on
word for every Inch OF tape. The RI
ceiving operators can read the recor
at q speed Of 30 to 100 words pc
minute
Tha time to record, develop. fl;
wash, and dry the tape 10 from two I
3 four minutes. The rolls OF tape ar
D 1000 feet long and continuous me
: sage OF 10000 words can be recorde
.zsfhnraf reIaaAina the machine.