The Savannah morning news. (Savannah, Ga.) 1900-current, 1900-07-23

conf, in speaking Of the subject Il car
ry sort of travelling library about me,
ne added, pointing TO pile of the most
abstruse scientific works, which | read
with a great deal of interest, and vet |
don't work ont my problems in the same
way. But | get a great deal of satisfac-
ton when ] verify actual experiments by
mathematical proof and find everything
as 1t should be The scientific spirit is
certainly not lacking in the young man of
& who finds entertainment in reading
treatises on exact electric measurements
variations of vibrations differenIial cal
culus and kindred topics.
Solved the 'TuninE" Problem.
The most widespread cry against the
usefulness Of wireless biography has been
been based on the fact that in
PERCEPTION of dispatches was for a long
time possible. 1t may not have occurred
to the DIRECTORS that the same fault may
be found with wire system of signalling
But by means of variable conductors and
capacities, Maconi has worked out sys-
tenn by which only certain Instruments
can receive certain messages. A. hundred
wireless instruments tapping out a hun
dred different messages or recording
hundred different dispa tches from as many
different places ranging in distance up to
most marvellous. yet Marconi is now able
to do that and much more He has taken
up the old problem of tuning" messages
and worked it out practically.
He obtained his results Only after many
eXperimenl some cannot realize how many
without having seen them. There Is an
infinite number Of possibilities, but once
the proper relation is established between
the transmitter and receiver, only a re-
turn TO that relation will bring the true
result. slight variation of the proper
resistance at either end is enough to
make the receiver imperative II is easy
to o. how almost any number of sets Of
instruments may be arranged, and with a
different ratio or relation each acting
without interference from any Of the 9th
ers. There is a familiar analogy in diff
ferent tuning forks responding TO differ
ent notes OF piano, only in the electric
tuning there are many more possibilities.
since the electric vibrations range from
one million to billions per second. When
the ether wave maker produces vibra-
ton Of 400 ,cc00Co000 per second he creates
slight, and when he gels q vibration Of
trillions per second, he has the X-ray.
The problem of prevention Of interceDted
messages has been attacked by NJ Tom
mast, who. as reported recently 20 the
Academic dies Sciences. used two transmit
ters at each station. one of which trans
mits the desired message, and the other
termed the blind" transmitter-a series
of meaningless dot and dashes BY keep
ing the range OF the blind transmitter
little less than the other, the apparatus
may be arranged so TINT only the real
message is received at the station and any
receiver interpcsed for the purpose of tap
ping will receive both message and the
tumble Of ezra dots and de- shes 90 that
the real message is not distinguishable.
MuItipleN Aerial Messages.
But this plan does not obviate the DOS.
siblity OF an outsider setting up a receiver
very near the o'her and out OF range or
the blind transmitter, nor vet Of setting
up counter transmitter which shan
Join" all signals Intended for the regular
station, M9rconrs present arrangement
prevents intcrceptiou of messages or lam
ming of Instruments. and, moreover. per
mits the use Of q large number OF installa.
tons in the same place In reality he has
improved on the multiplex system of wire
telegrsphy which Is so useful
In the use OF the aerial wire. Marconi