The sun. [volume] (New York [N.Y.]) 1833-1916, 1899-11-24
NOM TELEpHONE AND TEAEGRArH.
- w" H. .'I tn,,r,SS o,cann i""' VI"

Is" Used lDt"rchRnceRhIy.
The comparatively sudden introduction of the
telephone into the military world, and it's remark
ably extended use after introduction. have led
10 series Of valuable improvements. having
special reference To case al manipulation and Ger
tainty ui action. lie military telegraph, 10 meet
the requirements Of ITS application in the fields
must be strong, simple III construction. and as
light as possible, with a reliable call arrange
mcni, and battery, the elements Of which are
strong, durable and chemically stable
The conditions oi str,nglh and simplicity 81
construction. combined with light weight, are
easily atalnahlr, but the other condliluns arc
more dlilCut To- fulRll. II We were willing 10
sacrifice certain amount Of lighlness II would
be easy enough 10 obtain reliable call arrange
mcnt, by uslng Triple induction coil and an alter
Mating current generator: but; Of course, the in
creased size and weight Of the instrument is a
serious objection to lls use IN the field Again.
really Eo2a dry cell Ito fulfil the last condition.
These are the principal points that come up
ior cc"nsidctai,"n IN any suggestod improvement
stood IN order to appreciate The value Of such
lmpTnfrmcnis The new military telephones
recently il ;roIu,cd by the well Known manu-,
Ioskc, which is being tested hy he Tu mp can
armies, pIe.rnts number Of advantages over
In q wooden battery chest sN6N3 is inches and
leather telephone case luNbN2'. inches, the
Whole weighing about nine pounds The micro;
phone (Which also acts ~ n VIBRATOR il connected
part Of which contains The switch, tho circuit
w'h, the battery chest which contains, besides
the battery, the induction cobb by means Of a
well insulated wire oi several strands contact
Ichg made by inserting a contact pin. The
battery consists OF two llccscn dry cells typo
Il, ~. T. . volts. re itHn,c 0S ohm)
he mcrophpnc Is very ensitive and answers
9ll purposes. y layer Of gtanulAtcd carbon is
hcd IN place by q elk hHg and an adjustable
hpHnE, iiy THIS arrangement the micIophone
may he used in any position, and the tones pro-
duccd are clcnr and quite iir from any bu2zing
he connexions at n station are So arranged
that by closing Ley and circuit closer the primary
current III made. and a current INDUCED in the
territory wire OF the induction coil, which ly
weakening the permanent magnet In the micro
phone causes the diaphragm 10 move out by
this motion the bag Of graduated carbon Is clun.
gated. diminishing it, diameter and thus nCTeaS.
ing It's resistance, causing reverse current in
phrhgm move in, the latter motion causes the
ca bon bag 10 bulge uLdiminishng the TeSistRnrcs
and So on. These induced current hrc Of course
Iepcatcd In tho secondary wire and call forth a
distinctly audible humming sound, 9th in our
own telephone and that Of the corresponding
station, II now, by woving button on the cy lin
der the switch Is brought 10 the position for speak
Ing" keeping the circuit closer closed, but open
Ing the key, tho electro magnet Ia cut q T. and
We have merely an ordinary microphone circuit
are that II requires no regulating, furnishes a
clearly audible ca !, enables US (hy longer and
shorter pressurcs on the key, while the circuit
closer is Cosed) 70 express the dots and dashes II
the Morse any similar system. and furnishes
means Of pa sing al any moment from phonic
telrETaphy a. te ephOnic,
Whether the telephone will ultimately dispnce
the telegraph In war IL still undecided hut there
~ no doubt that The former on account Of It's great
advantages, will no used as long as II will work,
and then, II need DO, II will DO easy enough with
ap apparatus Like this Of Siemens 70 pass 10 the
telegraph.