Crystal Palace International Electric Exhibition 1881-82

23 g. Dublin (shore end). h. Seven-wire, deep sea. Modern type. i. Wexford (deep sea). j. One-wire (deep sea). Modern type. k. Firth of Tay. Z. Wexford (deep sea). m. North Lowestoft (deep sea). n. Wexford, old (shore end). o. South Lowestoft (shore end). p. Dublin (deep sea). q. North Lowestoft (shore end). r. Reuter’s. s. Channel Islands (shore end). t. Queen's Ferry. u. Channel Islands. [87.] MODEL OF A CABLE SHIP, by W. R. Culley, of the Sub-marine Department, G. P. O. [38.] DIAGRAM, showing the growth of the Post Office Telegraphs from the date of the transfer of the Telegraphs to the State up to the present date. [39.] NORWEGIAN WOODPECKERS, having pierced a telegraph-pole in search, of food. MODEL.—Showing the Manner in use in Norway to join Sub- marine Cables to Shore Lines. A line of the Norwegian telegraph, system extends along the coast in the interest of the fisheries and of navigation. This line has branches to the islets which are farthest from the coast, where movable telegraphic stations are established during the fishing season. Along the coast are also found, permanent stations for the use of traders and. fishermen voyaging to the fisheries. This system demands the application, of many small submarine cables for crossing "bays and straits in parts much exposed to the action of a high. sea. To protect these submarine cables against this action the cables are covered with, cast-iron pipes from the point where they touch the shore to a depth "below the action of the sea. A sample of these pipes will be found in the Exhibition. The ■construction is principally after the English fashion. As it would be both, inconvenient and costly to construct huts for all these small cables,