The Guthrie daily leader. [volume] (Guthrie, Okla.) 1893-1996, 1905-09-13


that promises to Ue Of spccial' salue g.
the military world
1hls new tendency in the deveioe
i-cnt Of wireless te,eeraphy depenas
ih principle On the well known photo.
soliale properties Of selenium This
metal changes rs electric rcsisance
under the influence OF light property
which has been app in the con.
-truction OF the pbotophone, an iustru.
mont for transmitting sounds Wy
means Of light This acts as follows
At the receiving station there Is
plate. Of seienibm in circuit with
small battery and a bell telephone; az
the sending station there Is Kind or
trsnsmitter in which the vibrations
due % the vcice cause light mirrvr
to yibrate. thus rejecting a beam OF
iigh, falling ON il at varying angles
consequently with varying Intensity
aslinst tho seicnium plate of the To-
ccNer The varying light intensity
prndrtes varying resistance in the
steninm. which causes variations in
the current passing through it from
ihc htge battery. and this again
csnses the original Sounds to be repro
dHcri in the telephone
The experiments OF last year nadc
80 tho physclst Ernst RUNNER. in con
iuacH with Che War and Naval Con
sr4eion Bureau of the sicmene-
hucEeri works Che manufacturers
Il the large searchlishis) on the
Wanrsee. making by means of
aohhaht which could throw its
bsams TO q considerable distance on a
aelenium cell certain ligh; signals. pio-
duccd co side able excitement in the
acieltidc $ orld. Ia that case. by means
Of a mioroDbone the sound waves CT
the voice were transformed into cleo
trical waves causing variations in the
current passing through an electric
arc light which produced correspond
ing variations of it's light intensity,
and thus made the electric arc lamp
speak. The latter was accomplished
by receiving the varying beams from
the electric arc light on a paraboic
mirror, which concentrated their ef-
fects on a seleRinm cell. acting as
above explained to reproduce the orig
inal sounds in a telephone in circuit
with the selenium.
This light telephony has now been
converted into telegraphy by an ar
rangement invented by Ruhmer In
this the arc lamp is influenced by an
induction coil with a mercury inter-
rupter, which together with Morse
key is inserted In the circuit of the
secondary coil. while the arc light cur
rent passes through the primary. II
the secondary circuit constantly and
rapidly interrupted, is closed by means
of the Morse key, there is produced In
the primary arc lamp circuit an undu-
aating current. which causes a rapid
variation in the light intensity of the
arc lamp. the effect Of which is trans
mltted to the selenium plae. In the
telephone connected with it this is re-
produced as a uniform tone, lasting ss
long as the Morse key closes the
secondary circuit By means of the
key, however. the long and short SYM
bols OF the Morse alphabet can lie
transmitted and distinctly made aadi-
bic as sounds In the receiving tele-
phone
The advantage of this system in a
military sense is evident The varia-
lions in light intensity cannot be de-
tected consequently the enemy cannot
take the message, even if he sees the
light. and the message transmitted can
therefore be- kept entirely secret This
is great advantage (Which does not
hold with the ordinary wireless telcg-
raphyl and the new system win prob
ably find considerable application in
the army and the navy. since it can
be readily combined with the search.
light plant on land. aboard ship or ia
Notifications.
The siemens-Schuckert works are
now constructing the apparatus re-
quired by this system for both sending
and receiving stations.