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PUBLIC RECORD OFFICE

Reference :-

TILICO.885

7

BE REPRODUCED PHOTOGRAPHIC- THOUT PERMISSION OF THE

COPYRIGHT PHOTOGRAPH-NOT TÓ

PU

AL

RECORD OFFICE, LONDON

48

Section 0.

Norfolk Island-New Zealand.

The Specification hereinbefore referred to.

Specification for the manufacture of the lengths and types of Cable to be furnished by the Contractors under the Contract.

Length in Nautical Milen

to be Manufactured.

Description.

Type.

Sheathing.

Core

130 lbs. Copper. 130 lbs. Gutta-percha.

Core not

Rock cable

Core brasa-sheatherl.

G

Type E 10, No. 2, reclosed with 6 No. (0 (380), galvanized and compounded.

075

Heavy shore end

AA

Type B1 12, No. 8, reclosed with 14 No. 1 (300), galvanized, compounded and yarn served.

5-5

*

Heavy intermediate...

E

10 No. 2 (280), galvanized, compounded,

and

yarn served.

11:5

Light intermediate ..........

B'

12 No. 8 (165), galvanized, compounded,

and yarn served.

55-25

Deep sca

16 No. 13 (095) galvanized, compounded,

and yarn served,

Conductor.

Insulator.

כן

brass-sheathed,

440.00

73.00

110-00

513 Nautical Miles.

Contract Length of Cable

Grand Total of Nautical Miles of Cable to be furnished by the Contractors

under the Contract for Sections A, B, and C

Section A.-Fiji (Suva)—Norfolk Island (Sydney Bay).

2,438

Section B.-Norfolk Island (Sydney Bay)—Queensland (Moreton Bay), Section C.---Norfolk Island (Sydney Bay)-New Zealanı.

130 lbs. copper. Core

130 ", gutta percha.

(A.) The conductor to consist of a strand of seven copper wires, the completed conductor to weigh 130 lbs. per nautical mile, or within 2 per cent. thereof, but the average weight per nautical mile shall not be less than that specified.

The resistance per nautical mile of the conductor at a temperature of 75 Fahrenheit shall not be more than 9:35 B.A. ohms.

The central wire to be drawn through compound before the surrounding wires are laid round it.

(B.) The conductor to be insulated with three or more coatings of gutta percha of uniform radial thickness, and of the best description and manufacture, and may be applied with or without the use of compound between the successive coatings of gutta percha; the dielectric shall weigh 130 lbs per nautical mile, or within 2 per cent. thereof, but the average weight of the insulator shall not be less than that specified.

-19

The core, seven days after manufacture, and not before this period has elapsed, shall be submitted for testing to the engineer or his representative.

For the purpose of these tests the core shall be immersed for at least 24 hours in water, having as nearly as practicable a temperature of 75 Fahrenheit, and when tested at this temperature the resistance of the dielectric, after one minute's electrification, shall not be less than 500 nor

more than 1,500 megohms per nautical mile, and its average inductive capacity shall not exceed 0-355 microfarads per nautical mile, and the maximum variation in the capacity of any coil is not to be higher than 5 per cent, above the average value specified.

The total weight of the core when completel to be 260 lbs., or within 24 per cent. thereof; the mean weight of the whole must be at least equal to the specified weight.

(C.) The cores of types ti, AA, E and B', specified as to be brass-sheathed, are to be Brass covered with a sheathing of brass tape four mils, thick, laid on spirally with a sufficient sheathing overlap and furtier covered with an ozokerited woven tape, the whole to be done in an approved manner.

(D.) Each evil of core shall, if required, be submitted to an alternate current of at least 5,000 volts. this electrical pressure to last fifteen minutes on each coil.

The oils of core to be delivered in lengths of not less than 15 nautical miles without joint, and the length and weight of conductor and dielectric of each coil shall be given in writing to the engineer.

No coil can be accepted that does not comply with the electrical conditions helbre

mentioned.

of cores.

(E.) The completed core to be covered with an ample and sufficient serving of jute Core sørv- yarn, steeped in euch or other approved preservative mixture of such strength as to have ing. the best preservative effect, and applied wet. The yarn to be of good quality, of oven size, free fun bumps, so as to give a uniform gange to the served core, and of suflicient strength to avoid breakages when being laid up. This serving is to be sufficient to prevent the sheashing wires being laid up so close as to render the cable too springy.

{

OUTER COVERINGS.

}

~F.) Lapu 142 | Rock Cable,)—Type E, as completed with outer serving, to be again Rock cable. served with farrel jute yarn and again closed with six galvanized low carbon basic iron wirs, No. 00 BW.G.. equal to 380 of an inch diameter when galvanize I. or within 24 jer veut, then of. The No. 00 wire of this outer sheathing spy dally sofi, and the lay to be sufficiently short to form a close covering round the inner cable.

(G.) Type 1.4. (Heavy Shore End.)-Type B light intermelite cable to be served Heavy with tarred jate yarn, and again closed with 14 galvanized low carbon basic iron shore end. wires, No. 1 BW.G., equal to 300 of an inch when galvanized, or within 24 per cent. thereof.

Averag· breaking train of No. 1 B.W.G. to be not less than 25 tous to the square inch, nor more than 30 tons to the square inch and to bear 12 twists in lengths of 6 inches,

(IL) Type 1. (Heavy Intermediate)-The served core to be covered with 10 Heavy in- galvanized low carbon basic iron wires, No. 2 B.W.G, equal to 80 of an inch when termediate. galvanized, or within 2 per cent. thereof.

Average breaking strain to be not less than 27 tons to the square inch nor more than 32 tons to the square inch, with an elongation of not less than 10 per cent., and to stand not less than 10 twists in lengths of 6 inches,

1.) Type B. (Light Intermediate.) The served core to be covered with 12 Light in- galvanized low carbon basic iron wires, No. 8 B.W.G., equal to 165 of an inch when termediate. galvanized or within 24 per cent, thereof.

...

Average breaking strain to be not less than 28 tons to the square inch nor more than 33 tons to the square inch, with an elongation of not less than 14 per cent., and to stand not less than 15 twists in lengths of 6 inches.

(3.) Type 1. (Deep Sea.)-The served core to be covered with 16 galvanized Deep ses, steel wires, cach wire being well covered with a bituminous compound.

5866-5