. BSTJ 1: 1. July 1922: Transmission Characteristics of the Submarine Cable. (Carson, John R.; Gilbert, ). surrounding assumption that the armor wires could be replaced by a solidcylinder of iron is, therefore, subject to question, since it is possiblethat the larger surface area of the assemblage of armor wires, andthe gaps between these wires may be effective in diminishing theenergy dissipated in the armoring and consequently diminishing thescreening effect. This problem is investigated in the following section. IV The physical system under consideration is shown schematicall
. BSTJ 1: 1. July 1922: Transmission Characteristics of the Submarine Cable. (Carson, John R.; Gilbert, ). surrounding assumption that the armor wires could be replaced by a solidcylinder of iron is, therefore, subject to question, since it is possiblethat the larger surface area of the assemblage of armor wires, andthe gaps between these wires may be effective in diminishing theenergy dissipated in the armoring and consequently diminishing thescreening effect. This problem is investigated in the following section. IV The physical system under consideration is shown schematicallyin cross-section in Fig. 4, and consists of an insulated conductor and TRANSMISSION OVER SUBMARINE CABLES 101 protective covering of jute, surrounded by a ring of N armor wiresimmersed in sea water. The method of solution is essentially similarto that given in the preceding pages, and consists in determining thevalues of electric field intensity at the outer surface of the core con-ductor and the inner surface of the return conductor, from which theinternal impedances of the two conductors can be Fig. 4 The main difficulty in the analysis is caused by the lack of uniaxialsymmetry in the return conductor. This was overcome by employ-ing a method developed by one of the authors2 in a study of trans-mission in parallel wires. The electric field intensity in the sea water satisfies the differentialequation 1 d2E „2 - —? dr- r dr r- 9<£2 - 4tt\hPIE = 0, the solution of which is a Fourier-Bessel expansion, E = AoK0 (ra) -Mi #i (ra) cos + A2K2 (ra) cos 20 + . . +, r and being referred to the axis of the particular wire. Assuming that the current distribution in the core conductor isindependent of the angle , that is, neglecting the individual char-acter of the armor wires only in their effect on the current distribu-tion in the core, the effect due to the current in the core is represented Wave Propagation over Parallel Wires; The Proximity Effect. John , Phil
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectarmor, bookyear1922
