Evening star., 1914-07-20
Uses Wireless Phone Regularly.

Narconis time has of late been given
over to the perfecting Of his wireless
| telephone apparatus and to the adapta-
ton of wireless to the uses Of the aero
plane. The first as has been stated. Is
now complete. For some time he had a
wireless phone in operation between his
office and the Savoy Hotel, across the
stree:. He has communicated between
ships at sea at distances of thirty or
forty miles with less difficulty than one
would experience in teiephon1ng to q
neighbor forty miles away. lie has heard
sounds through his wireless telephone
when efforts We're made 10 telephone
from Berlin to London. but the words
were iT.d:stiIlg gu;shabie. Further worh
needs to be done before long-distance
telephony may be expected as Il practical
biIity.
AT short distances. said Mr. Maroon,
i'll an effort to make clear in untechIical
language the difficulties he has encoun-
tered. the voice seems 70 dominate the
wireless waves but the distances are
increased and waves Of greater power
are ueeded in order 10 carry. the voice
, seems unable to control and dominate
the waves We need u greater and more
perfect apparatus for distance work.
But we shall be able to telephone by
wireless across the sea before teiephoh1is
Is possible by cable. The explanation IS
that with distance the sounds become
weaker when wirel SIS is Used, but the
voice is not distorted. one may near VITA
difficulty but the syllables are perfectly
articulatet. on the other hand, after
certain distance the sounds are distorted
In telephoning by cable. This distortion
f, increases with the square OF the dis
tance.
II should be made clear that at pres
ent there is no thought of establishing
q wireless telephone exchange. For the
present the wireless phone is for use only
on ships. All ships within the radius OF
the speaking instruments can take part
in any conversation that might be going
on.
"One might couple instruments toseth-
err said Marconi. But we have not given
that phase OF the problem any thought
as yet.
Some Experiments.
1.-THE day may come when it will be
possible to call by wireless from London
to New York for given phone-an1 be
free @: interference from any other
phone But we have not bothered with
this, because We 10 not believe that Wire
less telephony viii ever supplant wireless
telesraphy You could not speak code
words, for example. as you can write
them 1t is hard enough to understand
ordinary words over the best telephone
And codins Is a necessity of modern busl-
ness, for half dozen reasons"
Mr. Marconi has lately been very ac-
tive in his effort to adapt wireless teleg-
raphy to the use of aeroplanes. For
weeks Gustav Hamel, the brilliant young
si-n7an vino was recently drowned in the
English channel, over Which ne hao
flown in safety d score of times. was 4
daily visitor TO his office. and was one
of the most confirmed experimenters.
Three great difficulties stand in the road
of wirelessing from Q plane. according to
Marconi The first is the great weight
of the apparatus required, the second the
constant vibration. which interferes with
perfect Sending and receiving. and the
third a. purely human eicment-that OF
the excitement from which every man
who goes; up i'll a plane suffers. though
he may not realize it himself However,