US1874281A - Submarine signaling cable - Google Patents

Description

Aug. 30, 1932. J. J.-GILB ERT SUBIARINE SIGNALING CABLE Filed lay 18. 1929 J J. 6/4. BERT ATTORNEY l UNITED STATE a onacnonxns,.moonronnmnn, on nwyomn. Y.,mcon1onAmIo on nnwtron q v This invention relates tosubmarinesignal-f SUBMARIITE sierra QABLE. i

. Application filedbfiay ls,. IBQSL seri itascaiia ing cables in general and more a b particularly to cables of lthe twin core type.

of long loadedsubmarine telephonecables. Q A further object [of the inventionis to relosses of a twin core submarine signaling 7 a. In order to protect the gutta nerchaor other thermoplasticinsulation fofthe core off a submarine signalingcable from the attacks customaryto surround f such"portionsof the core which are l able. to lthe attacks with a metal layer 'suchfas lbrassq However, in the i flerjating at frequencies in' the voicelrange or highenthe eddy current losses inileredo tape 1 case of twin eore'cablesof great length 0p b of the usual dimensions become a factor of I importance. Such is the .casenot onlywhen Teredotape butalsowhen both eores are sure the cores each are surrounded by. a separate rounded byja common Teredo tape. QBymeth- I thetape.

" The Tere Code of analysisnot necessarytobe stated here itmay beshown that the losses occurring in: a 7' twin or other multiple core cable witheither ofthese typeset Teredoltape of the usual. e dimensions: are moretroublesome than with Wsingle core xconstru ytidnq These losses in crease the.attenuation 'ofthe signaling currents considerably and result in generalffrom .the. presence of.auriagnetidfieldhaving I I component perpendicular to the surface of other 1 high. frequency telephone conductors but-is not limitedyin its applicationeitherfto duce that portion ofthe dissipative electrical cable which aredue to the presence ot protective metallic envelopes such as Teredog f tapes.

dotapes as heretofore use lfhave '1 a widthor about oneinch. Such tapes on-a e twin core conductor would. causelarge losses -especially at voiceandjjhigher frequencies.

i} In? order to decrease thesei losses, thisfiin- 1 il vention proposesito depart fromfi previous F9 practice by usingta subdivided Tereidofpr tectiveisheath suchas a large number of tapes of" greatly reduced; or of oonvolutions -11118 invention is primai'ily a pl et big w. continuously loaded twin core telephonefor,

loaded colnductors or frequenciesias high as voice frequenclesbw M .LFig. Lot the accompanylng drawing d scloses a form ofith e inventioni n which the two cores of a it wi'n corecable have indif @Fig. .2 discloses an arrangementinawhich vidual lavers of Teredo tap e appliedftheretoi;

the two cores are surrounded withxa single wires closely spaced j :111 both figures 1 of the layer of Teredo protection in the formaof fine dr in o ductors of the cable may consist of thejusual.

.1 of Teredoes or other submar ne borers, itls :11 having applied thereto'lo'ading material 12 in the form of tape or wire which .isaims bedded in semi-liquid pressure equalizing .inaterial 12a,1the insulating material 13, lay

ers 14: andv16; of ute and .armoring. wire 18 being 0t suitable construction asindicatedp Referring more particularly. to Figbl .the

two, \or four or. any jother suitable number of relatively narrow tapes a pplied'swith a slight overlay as indicated. Theoverlapping par'ts,orthe entireinneritapesurface, ma

be insulated ftomdeach other L by-means of metallic oXide,1a' layer: of fabric imnregnated with bituminous'material or other; suitablein -b sulating agentsknown in the art. seeilfor example, Gilberts U. 11S. Patent 1,700,476; :Jan-

Tezbedoi protecting layermay consist of one, i

uaty329,f1'929.l The width of the tape 15 may. i

be asa maximum inch (12.7 mm.) andmay be narrower than down tothe extreme casein which thetape assumes the xform of wire. The Teredo tape 'or tapes 15 may be I severally surroundedby fabric tape 17 -pro vided for the .purposeof avoiding conductive fcontactof the metallic tape or ta pesoftone i core. with the tape or tapes of the other.

In the construction of Fig.2 a single Teredo protecting. layer is laid about the worming ofjutebl which serves to make two cores

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