F.—l
24
The following is a list of places between which existing circuits were improved or new circuits were provided : — Thames-Coromandel. Hastings-Taradale. Hamilton-Matamata. Hastings-Fernhill. Kohukohu-Kaitaia. T aradale-Meeanee. Kaeo-Mangonui. Napier-Kotemaori. Auckland-Paparoa. Napier Putorino. Auckland-Ruawai. Wanganui-Palmerston North Auckland-Mau ngaturoto. W anganui-Ha wera. Hamilton-Raglan. Eltham-Moeroa. Aotea-Raglan. Woodville-Ku meroa. Kawhia-Oparau. Wellington-Porirua. Te Kumi - Waitomo Caves. Wellington-Plimmerton-Pahautanui. Taupiri-Orini. Nelson-Murchison. Auckland Papakura. Glenhope-Murchison. Auckland-Manurewa. Motueka - Sandy Bay-Umukuri. Auckland-Pukekohe. Murchison - Owen River. Auckland -Waiuku. Murchison-Longford. Auckland-Patumahoe. Owen Junction - Gowan Bridge. Auckland-Tuakau. Greymouth-Reefton. Pukekohe-Waiuku Patumahoe. Geraldine - Peel Forest. Waiuku-Waipipi. Dunedin-Invercargill. Pukekohe-Paparata Valley. Dunedin-Gore. Patnmahoe - Waiau Pa. Ranfurly-Poolburn. Auckland-Henderson. Clyde-Cromwell. Henderson-Glen Eden. Invercargill-Wyndham. Napier-Gisborne. Gore-Wyndham. INTER-ISLAND TELEPHONE COMMUNICATION. The submarine portion of the continuously loaded four-core inter-Island telephone cable which was laid across Cook Strait in March, 1926, and of the laying of which an account was given in last year's report, was brought into use immediately to provide continuous telephone service between "Wellington and the Nelson, Blenheim, Picton, and Seddon Exchanges. From the 17th August, 1926, the facility of toll communication with Wellington was extended to the Canvastown, Havelock, Hillersden, Rai Valley, and Ward Exchanges. It was not possible to extend the range of communication beyond those limits until other works had been completed. These works included the laying and jointing of a trench cable between the extremities of the submarine cable and the Wellington and Seddon Exchanges respectively, the installation of telephone repeater equipment (valve amplifiers) at Wellington and Seddon, and the construction of an open aerial trunk telephone circuit between Seddon and Christchurch. To bridge the gaps between the landing-points of the submarine cable and the Wellington and Seddon Exchanges respectively it was necessary to lay eight and a half nautical miles of trench cable— three miles and a half of which was laid between the Wellington Central Exchange and Lyall Bay, and five miles between the Seddon Exchange and the mouth of the Blind River. To facilitate handling and transport at this end the trench cable was shipped from London in lengths of 520 yards. Although elaborate electrical tests had been made at the manufacturers' works to determine the best method of jointing-up the cores in the various lengths supplied, it was necessary to repeat the tests at Wellington before the laying of the ca.ble was commenced, in order that any necessary adjustments could be made in the jointing scheme in the event of its being found that any appreciable change had taken place in the electrical characteristics of the cable through the extensive handling that it had undergone before it reached the Department's stores. In a cable of this kind there are eight different methods of jointing the four cores together at each joint, and it is necessary to determine the order in which the various lengths should be laid and which of the eight core combinations should be adopted at each joint so that the electrical characteristics of the cores may be accurately balanced one against the other. This condition of balance is essential in order to ensure immunity from cross-talk and over-hearing between the telephone circuits, and to eliminate any interference in the telephone circuits caused by the transmission of telegraph signals over the superimposed telegraph circuits. By the use of suitable terminal apparatus, three telephone circuits and four single-current telegraph circuits will be operated over the four cores of the cable. It is satisfactory to note that the final tests of the completed cable from the Wellington Central Exchange to the Seddon Exchange show that its efficiency in every respect is the same as when it was despatched from the works. The new building at Seddon for housing the telephone repeater equipment associated with the cable was completed in November, 1926. The repeater equipment was delivered in the Dominion early in February, 1927, and installation at Wellington and Seddon is now in progress. It is expected that the equipment will be tested out and ready for use about the end of June, 1927. The construction of the telephone trunk circuit between Seddon and Christchurch, referred to at page 23, should also be completed in June; and it may be expected that the inter-Island telephone service will be extended about that time to permit of toll service being available between
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