The evening times. [volume] (Washington, D.C.) 1895-1902, 1897-04-23
FASTEST TELEGRAPH OF ALL
The Wonderful New System In
vented by Prof. CrehOre.
SENDS 5000 WORDS A MINUTE
BY Using AN Alternating Current All
Other Rapid Telegraphs Are D-s-
tanced-Two Messages Over OIe
Wire at the Same Time Vast Pos
sibiIities of the New Discovery.

ing paper was read Wednesday night be-
fore the American Society of Mechanical
Engineers at the clubhouse, No IL West
Thirty-first street, by Prof. Albert Cush-
ing Crehore, of Dartmouth College, de-
scribing a new method of very rapid teie-
graphing by the use Collaborating currents,
which has been developed by Prof. Crehore
and Lieut. George Owen Squier OF the
United States Army. The experiments
which resulted in the development of the
new system were carried on at the United
States Artillery School at Fort Monroe Va,
where a considerable length of telegraph
and telephone wires was available for the
purpose. The lecture was illustrated By
lantern slides.
The paper was extremely technical, as
was necessary i'll explaining the principles
involved and the means by which these
may be utilized: but the results which it
is said may be Accomplished by the new
system are astonishing An ordinary teIe-
graph operator sending messages by the
Morse system can transmit from thirty 10
stone system, where the messages are first
prepared On punched strip of paper and
then transmitted automatically, speed Is
attained of 100 TO 200 words minute
BY the system desc ribed by Prof Crehore,
tits promisedthat d speed OF 5000 words a
minute may he attained over a single wire,
and at the same time the wire could be
used for sending other messages by the
system without creating any interference
IL is also possible TO send two entirely
different messages over the same line at
oletime at the rate OF 3 900 words minute,
and in addition 10 this the messages could
he transuitied 20 and received at any num-
her of stations at the same instant and
recorded automatically.
Like other automatic systems il would
he necessary to have the messages pre-
pared for sending on slips or sheets OF
paper, punched with the proper signals 10
represent letters in accordance with the
European modification Of the Morse code
The general method by which this wonder
full speed is to he accomplished is by taking
advantage Of the popularity OF the alter
mating current, in which currents of op-
posite poIa Tity succeed each other with
a rapidity varying in different dynamos
from about $50 to 400 u second. Between
each pair OF these waves OF current is q
moment when the wire is neutral By
means of ii simple device, which was de-
scTlbed. these currents may be interrupted
at fixed Intervals, and one or more wave
movements of current omitted. By noting
these interruptions and their order the
messages can be read
OF course, this CUuI no be done by means
OF tie eve, or 10y any mechanical apparatus
in which any material thing had 20 move.
and one Of the most interesting parts 81
the new system is that or receiving the
messages Two methods have been tried
successfully for this purpose. One de-
ponds upon the principle that light. po-
larized by being passed through a prism,
may be turned from its direction by pass
ing it through a coil of wire through which |
an electric current is passing. power |
full ray of light is first pa ssed into two |
prsins in such way thai none Of il gets |
through Between The prislnS is placed "A |
glass tUbe containing sulplide OF carbon |
Around this is the coil Of wire which car |
ries the current. Whenever a current |
paSses. the light is DETECTED one way or |
another. so that some oft gets through the /
two priSuIs and falls upon a moving sen |
sitizei pa per and makes a dot
The other proposed receiver j. q chemical i
one. where needles press upon a moving !
per properly prepared. andleave a mark |
whenever a current passes through them.
A needle can be used for each of the cur
rents sent Out-a direct current nd the re-
versel one-and so two records made side /
by side at the same time Tits by the use |
OF devices of this kind placed in as many |
receiving Offices as might be desired that |
received at once.
The possibilities orsuCh a system are vast
one of those suggested by Prof CrehOre /
is thata few telegraph wires mig ht trans
nit all Of the more important business now /
conducted by mali Typewriters. he said, |
could be fitted with automatic devices
for punching the characters of the code at
the same moment that tine operator was /
writing Iris ordinary letteTpreSs copy. and |
these perforated papers would be sent - |
the telegraph office to be forwarded. Forty |
thousand letters are carried daily bt- |
tween Chicago and New York. Prof |
CTehOre said it would take but two wires |
worked by the new system, to transmit |
this entire correspondence and make 1t !
possible for person To send his letter and |
get reply the same day allowing for the |
time OF delivery Typewriters and Stenug |
rapheTs he added, world have to learn o. J
read the telegraph code in addition 10 |
their present ACCOMPLISHMENTS