The new North-west. [volume] (Deer Lodge, Mont.) 1869-1897, 1872-03-09
TELEGRAPH CABLES .
How They are Made aud Insulated.

Ile CONSTRUCTION u . yebe3tUpO1e CAOt0 u
very interesting pr'cess The drst step is
making what 10 termed the core. Or conduct
ing agent of copper wire. The earlier
cables were generally made with one c"n
ductor of thick wire. hut 1t was found that.
to use popular saying, this plan was the
mistake Of putting all the egg. int" one
basket. If this thick wire were IN break-an
accident to which it was very liable in the
oct of laying it-ti,ese would have been
breach Of continuity, the tongue winch
talks under the ocean would have been
struck with paralysis. In order to avoid
this. ss,rotg central wireof thebeat oopppcr
is used. and round this a number of fine
wires sre twisted. By this method thsiffac.
ture Of the central or base wire 10 no longer
of importance. % The small wires, even II
there was strain upon the cable, wosd
carry the curans. Indeed. We have seent
cables that have been brokes and dray<ed
asunder many inches still geographically
perfect. for this reason The twisting 1T the
fine wires round the central one is very sim
ilar I" the waking at ordinary rope. In or
der to ipsulaae tho conductor, thin slips ut
India rublser ribbon are carefully plated
over it. When ske whole length be- been
thus plated, in order ts secure the edges
tho csaae h psssed throosb tank Of liquid
Ipd,s Enbber. which cements them together.
The core has now to be asmored. when pro.
tsotiow 10 required fcr deep Or rough ssaS,
This is done BY laying stoat iron wires lon~
gitudinsljy and parsilel With the core but
these again have to be projected against the
action Of the ~ vaaef. which y dose BY =
plating Of hemp. ! coating of tas complet'
Ing the ,,roeesA ! When excessively rough
or r,cky shores have u bs guarded sssinst
the shors ends of he oable are ps"tected by
several additional layers Of wire arnaor and
bs,npen guards. Wben accidents happen
u CABLES after they have been laid. ths csh,s
~ 70 be hshed up and tho fault found and
spiiced. .,- a., "a !,
The ilndius of fault ID ths d1ip poess
my appear to the reader very di4enh.
nay, IN impossible opssation.f For hstasee.
70 have 70 psy In the Atiastic cabSe 'asd ex.,
anime II inch by inch, In ordeuto disossss
pcsssbly mere pin~hoit, womb eesn = -
! very labor OF Hercules. But ecisoes =
eauaa u me task. Ths Ian. .slitins
ID his rosm = his instsunesk by nela!n!s of
dslicsts appliasess, cas sialaase 10 vtahis
! mne y two TIE diseanes at vhttA the fsnlt ~
b 70 be found Nevertheless, every Pre-
esu.iosie taksSlis prevent thsss ultimate
spssl, " scisnee,, for the astsise OF dep
eee ciabls 4 % childs play, and ths eoss y
erss; conseqssle,y. Ssssy .psseanttoa is
eaapss @ secsrs ~ .pss1sps, insslaal1a St e ~
cshs .sAils Il y tslaG n,saufaessgsd. Bss
fore e,sy,of ths,s. nafysi'sSe y tnslkink Millts
isacsspasd - 49, pqrchasssy y : s,9s!ssse
,o,sc. m toA sestalp GlRsns opaipe. Ard -
or1sr . secpss ,thie shsSalC as a ~ NJ ~ =.
L,Iaaas LIai =, rSniae,tbs y aansof.ths tase aaAes.
49, ,thjs inapls4iba 81; usgd - hqgtde
csica. = nosAsk0o - tPaneoeooi9G ~
~ q n. .nases6 aArueeha dses shySssnhcy
surg 5sss1tllix - I ,tsps - " T.
csss ssc. \ - r. wass sSss s3s:seisd. : tt
vaysd Z sss.4a 4 - = e&:cs s, ~ r.
.ss~2eS 5sa - - ~ saheial y.
1SesSY.Isa :sS q 80 go \; Is; : = y II 5ssSi;'
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