The sun., 1919-11-02

send faster than 1t could be received,
but now the situation has been re-
versed.
The Photographic recorder in daily
operation at Bar Harbor has repeat
edly recorded regular trafflc schedules
ranging from 1000 to 1000 words
without interruption; and at a speed of
forty to fifty words a minute every
word is perfect and easily and quickly.
read 1t is used supplementary to the
ordinary type Of receiving set.
Not only is the message perma-
uently recorded on tape OF special
Photographic paper, but a fleeting
visual image of the signals can be
seen on the ground glass of the ma
chine at the same instant that the
electric impulses arrive from the
antenna. And even more than this
an audible reception can also be made
simultaneously by the regular tele-
phone method. Heretofore there has
been no visible record to refer to In
case any doubt arises as to the accu-
racy of the Interpretation Of the mes
sage from distant shores. Some Euro
pean stations repeat each word in
every message.
The mechanism is based on a COM
paratively simple electrical engineering
principle. light weight mirror "fiut-
ters" in electro agnetic tune with
the minute electric impulses coming
from the receiving antenna. The du-
ration and extent of the mirrors os-
citations vary according to the dot.
dash or silence of the sending station.
u. l. 10 - 1ssrt,N
the moving sensitized tape. This tape,
propelled by an electric motor, pro-
crosses up and down through the YER
tical pipes which contain the develop
ing and fixing chemicals.
Washed In Running Water.
Automatically the tape enters the
developing fluid and then the hypo
fixing bath; then it is washed in run
ming water. and is dried by electric
heat assisted by forced draft--all in
visibly effected inside this single ma
chine. Like the tape from a stock
ticker, the message pours out Of the
wonderful device and into a basket.
In regard to receiving there is an av-
erage of one word for every inch OF
tape. The receiving operators can
-ead the record at a speed of 80 to 100
words a minute.
The time to record, develop, fix.
wash and dry the tape is from two
| to four minutes. The rolls Of tape are
| 1000 feet long and a continuous mes
sage of 10000 words can be recorded
without reloading the machine.
A recent remarkable performance OF
this machine promises great things.
AS told by Mr.. Hoxie:
Two simultaneous messages from
different sources were coming into one
receiving circuit connected to the new
Photographic recorder. One of these
messages was sent at a train fire.
quency of 1000 cycles a second and
the other at 975 cycles a second. Ordi.
narily two frequencies so close to each
other Would have interfered with re-
ception, and / was pleased that could
receive one of the messages. But by
| slight adjustment Of the machine I
was able to receive the other message:
| then back to the first; then switched
off to the second-receiving either
message without interference from the
| other.
II hope to perfect the instrument
| so that in the not far distant future
several Photographic recorders can be
attached to a single antenna and
| simultaneously receive and record mes
sages from Rome, Lyons. Caravan,
Wales; Nauen, Germany. and San
Francisco This may be called stimuli
| taneous multipleX receiving from one
| antenna.
when this is accomplished an in
ternational receiving station would
have but single antenna. and in a
room inside the station there would
be row of machines with tapes pour
| ing into baskets. One could pause at
the first basket and read OF the new
President Of Germany; stepping to the
next basket he would read of a vol
canic eruption in the Philippines and
only a few feet further on will be the
baskets marked London Paris
| Rome San Francisco Sydney and
Shanghai"