Burlington weekly free press. [volume] (Burlington, Vt.) 1866-1928, 1912-06-20

stances.
or course, II does not follow from these
failures that a practical system Of wire
less, or, as the experts perfer to call
II. radio-tele phony, will not be forth
coming In the near future Indeed. one
| or the current announcements may re-
cora the first success But what past
failures do Justify Is Il Missouri like
skepticism that insists on being shown
Laboratory demonstrations of this, as
| or most other practical applications of
science are chiefly suggestive as to Dos
sible commercial applications. There an
pears to be no doubt that experimental
distances OF several hundred miles have
been attained by more than one of the
present radio-te telephone systems But
what the man In the street viii wait for
before Investing his money In radio-tele-
phone stock-he Will, that is II reason
able caution is in hints a public install
lation soliciting commercial business.
ETHER-TELEGRAPH MUCH
EASIER
When wireless telcgraphy became
practical reality, 1t was naturally ASSUME
ed ny the laity that telephony would in
due course be unwred But the inven-
tors found a lot of new difficulties to be
overcome, and though the wireless tele-
graphic experience helned Thorn /, fur.
nished little more than n foundation for
the new work. It was n much easler
problem to transmit through the ether
the few arbitrary signs of the tclecrap nh
| ic codes than to carry the extremely
complex variations of articulate speech.
I'm the first placc. the frequency of the
electrical discharges used Mt the trans
initths station or the wireless telegraph
hau 10 De greatly Increased ana rendered
as uniform as possible. When a dynamo
| is used as generator thls involves con-
siderable mechanical difficulty. Prof. X.
a Fcssehden mas apparently, solved
TINS diihcuity Tor generators of consider
apie size In the Ioulsen and RUNNER
systems the mechanical dynamo prob
ierhs are aVo'ded py producing the os-
eil'atiohs IN specially arranged arc,
ou' tlns apparatus introduces new set
Oh oii''cuites' II may be said incidental
!! that the new osciIIatlon producing
arc described recently by British in
Vchtor' H. H. Chaffee. seems TO have
uo''e something toward improving this
oeNlce' some ldea or It's natural defects
may be gathered from the following
advantages OF MS copper aluminium arc:
Inc reiharkaple consistency and regu-
iari'y as a generator of continuous os-
ciIlatiohs mas been proved to be of great
Value Tor the wireless transmission of
aruculate speech. The new arc, though
OF very limited power, produces oscilla-
''ons Oh frequency running into the
ih!iiiohs'
|
Another reason for the need of high
frequency in these radio-teleDhonic i'm
pulses is the fact that larger amounts
comparatively small amounts of cleo
| tricity. In the wired TELEPHONE the cur
rent used is extremely small and the
Instruments can. without trouble he
made sensitive, and hence more or less
delicate. Gut in the radio-telephone.
even with the high freuuencies used T.,
has proved a difficult thing to protect
the speech transmitting micronhone
when energy necessary to send messages
ovor a considerable distance &c a,rrio,.-
ed. 1t was to avoid this difficulty that
lois'so, NaJoraha OF Rome devised his
IIo'' NM 'p'io"e' foulseh USED multiple
VI, ~ u'Niue up the strain.
''e requirement or hlsh IRE
me i"u'o-'elephohlc oscillations
r, "''aiiiPeu' or pfacticaiiy so.
.",'afS ACKNOWLEDGEMENTS oscilla-
~ away rap'o'y' furthermore
u TRANSMITTING speech INTO
"a '''eHe osc''ations had TO be
,o.,. 'o0uia'e ana certain mat the
,., ""''S eouiu Do picked up
ma,ica,,.' ra..a.,, "S anu auto