The Chickasha daily express. (Chickasha, Indian Territory [Okla.]) 1899-current, 1901-02-14

frLrrnlnihA tFr11A1 1rN~E
Belief rhat Twelve Miles IS Not T,s Par
Yer ne system
Tua recent test 81 wireless telephony
across the Mississippi River. at ST.
Paul evidence was given 81 the utility
Of the method which may result IN the
adoption Of the plan when the mechan-
ism has been perfected The distance
across the river az that point is 100
feet and. ID spite Of a strong wind
and extremely cold weather. conversa-
ton was carried on with nule difcui-
IS The name wireless telephony Is
something 0f a misn0mer. IS wires
have 70 he used One hundred and
6fty feet were stretched parallel 70 the
river On eaeL side and the fransmifters
and receivers were attached to each
set. the voice vibrations being carried
across the river from one and regis
tered On the other For a time tile ex-
pertinent worked well but before long
the moisture % the breath got into the
diaphfagms. freezing them to such an
extent thar they had TO he thawed out
and then lid not DO as good work The
cold weather. however. was of advan
tage 10 one respect. as thick ice ex
tended out into the river for some
distance from each side. and there was
no doubt that il aided in transferring
the current across the stream.
When the wires and apparatus were
ia place r test was made with a voli.
meter. and IL was found that there WAS
induction of half a volt. which made il
look as If the experiment could not be
carried on. In spite Of this. however.
the sound Of the voice was easily and
clearly transmitted. The first trial
was with five volts Of battery. and ID >
sound Of the voice could BE- heard. a.
though words could not be distin-
gulshed Later without any change
Ia apparatus or current. the words
could be distinguished as easily as IN 4
direct telephone. and afterwards the
sounds were mufHed and could not be
distinguished other batteries were
then attached. FIVE az a time. finally
cutting in with twenty volts on one
side of the river and i've on the other
The operator at the f-e-volt end could
not only understand what was being
said 70 him. hut could hear others |
talking on the bank Of the river near /
the transmitter. Then the diaphragms |
began to freeze. and after they were
thawed out. as has been stated. did not /
work
A second experiment was tried two I
days later. 300 feet Of twelve-gauge I
copper wire heing used on each side Of
the river As before. the ends Of the
wire were run into the river to make
a ground. and the only experiment that
failed was the attempt 10 talk without
the aid Of batteries. The test was
made with twenty-five and one-half
volts on each side Of the river. and It
was calculated that forty-hve could
have been used with safety From this
It was deduced that by increasing the
length OF the side lines the battery
could be increased so as 10
talk up TO twelve miles without fear OF
heating the transmitter. Measurements
By the ammeter showed that the earth
current was 1880. that whistling
-aised the reading to 2074. talking IN a
voice to $500. and talking IN
/ loud voice 70 800. The ordinary
alking current registered 1890 am
1eres. and with 400 feet Of wire and a
resistance Of $50 ohms would equal
me third OF an ohm to the foot.-NeW
FORK Post