|
The cable for this extensive system was manufactured by the India Rubber, Gutta Percha & Telegraph Works Company of Silvertown for the West India and Panama Telegraph Company, a company set up by Sir Charles Tilston Bright with General W.F. Smith and Cyrus Field of the International Ocean Telegraph Company and Matthew Gray of IRGP.
The system eventually interconnected the many islands in the region, with a link to Panama. A new line from Florida to Cuba had earlier been laid by Bright, so the completion of the link from Cuba to Jamaica provided a route from Jamaica to Europe via North America. The cableship used throughout the expedition was the Dacia, assisted by other vessels as needed.
Though laying commenced in 1870 it was 1873 before the network was in full working order. The system comprised:
Santiago de Cuba - Kingston, Jamaica - Colon, Panama
Kingston - San Juan, Puerto Rico - St. Thomas - St. Kitts - Antigua
Guadeloupe - Dominica - Martinique - St. Lucia - St. Vincent - Barbados.
St. Vincent - Grenada - Trinidad - British Guiana
West India & Panama Telegraph Col Ltd.
Detail of cable route from 1928 cablegram form
|
 |
The following account of the manufacture of the cable is taken from the 1898 biography of Sir Charles Bright written by his brother, Edward Brailsford Bright, and his son, Charles Bright.
The type of cable specified by Sir Charles Bright was similar to that which had proved such a success in the heated waters of the Persian Gulf, the patent outer protective wrappings with Bright & Clark's compound being applied; but the copper conductor was stranded instead of segmental, weighing 107 lbs. per mile, the gutta percha weighed 166 lbs. per mile.
There were as many as four types made to suit the various depths. These consisted of very heavy shore ends weighing 16 tons per mile, intermediate of 5 tons per mile, and deep sea of 2½ tons for depths up to 700 fathoms, and for beyond that depth 1 ton 12 cwt. The general character of the main cable was undoubtedly well chosen, as the "open jawed" types adopted for the Atlantic cables of 1865 and 1866 were already showing signs of deterioration.
The whole of the 4,000 and odd miles, weighing nearly 10,000 tons, were made at Silvertown by the India Rubber Company between the latter part of 1869 and the summer of 1870, under the constant supervision of Sir Charles and a highly trained staff, who afterwards went out to assist in the arduous work.
As well as being one of the promoters of the West India and Panama Telegraph Company, Sir Charles Bright was Engineer of the project, and was directly involved in the cable laying. The cable crew had just finished laying the local cables around Cuba, which provided for the first time reliable communication among the major cities of the country. As described in Bright's biography this was celebrated with extensive festivities in Cuba, and the expedition proceeded from there to Jamaica:
The "Cuba" Company's lines being at last brought to a successful issue, the "West India and Panama" series of cables had to be tackled.
Continuing in the route, the first section of this system to be laid was naturally that from Santiago (Cuba) to Holland Bay, on the north-east coast of
Jamaica.
| The above stickiness of the outer compound and a want of lime are matters noted in Sir Charles Bright's diary as entirely novel experiences, such as he had never before met with in laying cables in the Persian Gulf or other tropical climates. |
Whilst all the preceding festivities were going on, preparations were being made for the laying of these future sections by the turning over of great lengths of cable from one tank to another in order to remedy a sticky condition which had proved a great source of trouble in paying out [see sidebar]. Indeed, it was only owing to this being necessary as soon as the Cuban lines were completed, and partly on account of faults in the insulation, that social entertainments as above described could be given time for.
The Cuba- Jamaica cable was laid after some trouble (starting on September 13th), but without any
incident of special or novel interest. The shore end was landed near Plantain Garden Harbour, in Holland Bay [close to Morant Point, an eastern promontory of the island] (from a string of boats), and the final splice effected on September 15th.
Shown below is a cable sample case for the project, and the telegram Bright sent on 16 September 1870 to "His Excellency the Administrator" in Kingston, Jamaica, from the cable landing site at Holland Bay on Jamaica's eastern shore.
|
 |
| Cable sample case and telegram |
West India and Panama Telegraph Company, Limited
Kingston Station
Received the following Message the 16 day of Sept 1870
From Sir Charles Bright, Holland Bay
To His Excellency the Administrator, Kingston
Friday. I am happy to acquaint your Excellency that the shore end of the Cuba & Jamaica cable was landed last night here completing telegraphic communication between Jamaica & Europe. Any messages you wish to send home will be forwarded. |
THE following appeared in the Pall Mall Gazette during July, 1870:—
THE WEST INDIAN TELEGRAPH EXPEDITION
ONE of the largest and best equipped telegraph expeditions that ever left these shores will in a few days begin to start on its labours. We say begin to start, for the whole squadron will comprise no fewer than seven large vessels carrying between them more than 4,200 miles of submarine cable. These cables—for as usual now they are of the composite kind, and vary in strength and weight, according as they are to be laid in deep or shallow water—represent the united labours of three companies which have been working together, and a capital of £1,150,000. The West India and Panama Company contributes £650,000 and 2,55o miles of cable, the Cuba Submarine Company 160,000 and 52o miles of cable, and the Panama and South Pacific £320,000 and 1,100 miles of line, making with the land lines no less than 4,700 miles of additional electrical communication, which, when connected with the land lines already existing in North and South America, will literally place every part of that vast continent within a few hours’ communication with London.
The line from Florida to Havana was laid the year before last by Sir Charles Bright. In the attempt it was broken by a fearful storm, and lost in a mile depth of water. It was, however, almost immediately after picked up again with the grappling irons and brought to the surface through a sea which was wildly agitated, and running with a current of still nearly four
knots. This, in the annals of submarine telegraphy, is reckoned as great a feat as the finding of the lost Atlantic cable of 1865. Since then the Cuba cable, as it is called, has worked admirably,
messages having actually been sent from the London Stock Exchange to Havana and answers received in three hours. This has naturally led
the other West Indian islands to seek similar facilities for trade.
Accordingly, the lines now to be laid will, as we have said, connect the islands with North America, and thence with Europe, while on the south communication will be afforded to the east and west coasts of South America. From Florida to Havana the cable is already laid, and from Havana across Cuba there are two rows of land lines to the port of Cienfugos. Here it is proposed to commence operations, carrying
a submarine line along the coast of Cuba from Cienfugos to Santiago, the second great city of the island. From Santiago it passes under the sea at a very uniform depth of about 700 fathoms to
Jamaica, landing somewhere in the neighbourhood of Morant's Bay, whence the land lines take it across the neck of the island to Kingston.
At Kingston the submarine line branches off in two directions. One goes due south under the Caribbean Sea to Aspinwall, where it joins the South Pacific lines, which pass down the south-east coast of America to Valparaiso. The other branch from Kingston goes east and then south, passing south of Hayti to Porto Rico, thence to St. Thomas, St. Kitts, Antigua, Dominica, Barbadoes, Tobago, and Trinidad [Note 1].
Cable office, St. Thomas, W.I., U.S.A. |
From Trinidad it will pass by cable across the mouths of the Orinoco to Georgetown, thence by land lines to Cayenne, and so on eventually by further land lines across Brazil to Rio and Monte Video. In fact, by these lines all South America and the West Indies will be as easy of access for messages from Europe and India as New York and Boston are now. When the scheme was first announced all the islands were most anxious to join it, and those which have joined it give subsidies to the company amounting to about £20,000 a year for ten years.
[Note 1]
These plans ultimately received modification as regards these sections connecting the Windward Islands by the cable being landed at Guadeloupe, Dominica, Martinique, St. Lucia, St. Vincent, Barbadoes, Granada, and Trinidad. At first, some of the French colonies stood out owing to the promoters of a French company influencing the officials; but eventually—the latter scheme not being realised at the time—they were included
in the West India and Panama Company's system. |
The submarine cables which have been made are among the most perfect of their kind. They have all been manufactured at the Silvertown factory of the India Rubber, Gutta Percha, and Telegraph Works Company at a rate which, considering their high testing excellence, is really remarkable. The copper conductor of seven wires and the insulation of gutta percha is uniform throughout, the former weighing 107 lb. to the mile, and the latter 166 lb. The actual strength of the outer covering of the cable differs very materially. Thus the shore ends at landing-places where the water is shallow and the surf high—and there are more than forty of such places—are of the most massive description, weighing sixteen tons to the mile. The powerful outer wires are thickly coated with Bright and Clark's compound of silica and tar, which effectually shields it from the attacks of the much dreaded teredo.
The next portion of the cable is called intermediate, as resting in neither deep nor shallow water. It weighs five tons to the mile, and for its weight is unusually strong, the wires being of soft steel. For 600 and 70o fathoms the Cuba pattern is adopted, weighing two-and-a-half tons to the mile; the deep-sea lengths weigh 32 cwt. to the mile. The proximate value of these weights as regards strength may be judged by the fact that the first Atlantic cable weighed only one ton per mile throughout its length.
The cables have been manufactured under a guarantee that their insulation should never be less than 250,000,000 units when tested in water at a temperature of seventy-five degrees. It is easy to explain what this degree of excellence means. The electric current when sent through a cable is always trying to escape back to its source by the shortest passage—in other words, to find a flaw in the insulation and get out. In exact proportion as the cable is well insulated, so will be the resistance of the current to entering the wire. This amount of resistance is easily tested by the galvanometer, and is counted in millions of units. If a cable which ought to give 100,000,000 of units resistance is found on testing to give only 50,00,000, then it is evident that the current is going through the cable quicker than it ought, and that instead of all going on to the end it is leaking out from many apertures of escape. Thus cables are always tested by the resistance which their insulation offers to the current, and the greater their resistance the more perfect their insulation will be. T he West India cables have been guaranteed to give 250,000,000 units, but as a fact some portions have given 500,000,0o, and this in water at so high a temperature as seventy-five degrees.
The whole expedition is under the sole charge of the chief engineer and electrician, Sir Charles Bright. He takes with him an able staff
of assistants, both as electricians and practised cable layers. The whole work of coupling up the West India islands with Europe and North and South America will, it is expected, be complete by the end of the year.
|
