A Yacht Voyage Round England

by William Henry Giles Kingston

themselves really useful. Their regular schooling goes on all the time. Officers in the navy are far more highly educated than they used to be in days of yore, when a knowledge of navigation and seamanship was all that was required.

Papa knew one of the officers, so we went on board the ship. It is fitted up with a large school-room, class-rooms, and dormitories. She has only the few guns necessary for exercising. Though once a line-of-battle ship—being built of wood—she would be unable to compete with ironclads, and of course her fighting days are over.

The wind being fair, we stood out of the Dart in the afternoon, and steered for the Start. At the end of the Start is a lofty tower. It was visible at sunset, when the wind fell almost calm. The tide was favourable, however, and we made some way. In a short time a brilliant revolving light flashed across the waters. It can be seen nineteen miles off, the tower being two hundred and four feet above high-water. In the tower is a bell, which is rung during fogs, to warn ships from approaching too near. The light is a dioptric or lens-light of the first order. The apparatus consists of a central powerful lamp; round this is placed an arrangement of glass, so formed as to refract these beams into parallel rays in the required directions.

Lenses were employed in lighthouses at a very early period. When they were first made they were used for burning instruments, by collecting the rays of the sun. It was seen, however, that they would equally collect the rays of a lamp. They have of late years been very greatly improved by a celebrated glass manufacturer. Great indeed has been the improvement in lighthouses. Once upon a time they were simply high towers, which had on their summits open fireplaces, in which either wood or coal fires were burned. They were often unserviceable at the very time their services were most required. During a heavy gale, for instance, when the wind was blowing towards the land, it drove the flames of an open fire away from the direction in which they were most wanted to be seen. Sometimes, in fog or rain, the glare of the fire was visible by refraction in the atmosphere, although the fire itself could not be seen. Such was the tower of the North Foreland. This lighthouse existed in 1636, and merely had a large glass lantern fixed on the top of a timber erection, which, however, was burnt in 1683. Towards the end of the same century a portion of the present structure was raised, having an iron grate on the summit. It being found difficult to keep a proper flame in windy or rainy weather, about 1782 it was covered in with a roof and large sash windows, and a coal fire was kept alight by means of enormous bellows, which the attendants worked throughout the night.

This very primitive means of maintaining a light was exchanged in 1790 for a lantern, with lamps and other apparatus. The Eddystone lighthouse was from the first illuminated by means of a chandelier, containing twenty-four wax candles, five of which weighed two pounds. The Liverpool lighthouses had oil lamps, with rude reflectors. Down to the year 1823 coal fires were used in several lighthouses. Really good lights have come into universal use only during the last few years; and it is said that on the west coast of Sweden a coal fire is still used at an important lighthouse.

The Argand lamp is generally employed in lighthouses. It was the greatest advance in artificial lighting until the introduction of gas. It was discovered by Monsieur Argand, a citizen of Geneva. He was trying experiments with a common lamp he had invented. A younger brother describes its accidental discovery. He says: “My brother had long been trying to bring his lamp to perfection. The neck of a broken flask was lying on the chimney-piece. I happened to reach across the table, and to place it over the circular flame of the lamp. Immediately it rose with brilliancy. My brother started from his seat in ecstasy, rushed upon me in a transport of joy, and embraced me with rapture.” Thus was the new form of lamp discovered.

Various forms of cylindrical wick lamps are employed for illuminating lighthouses. For reflectors the wick is nearly an inch in diameter. For the lens-light a more powerful and complicated lamp is used. The oil is made to flow into the burners by various means. The most simple is by placing the reservoir higher than the lamp, the oil thus flowing by its own gravity to the level required. Mineral oil is now generally used, as being superior to rape-seed or sperm oil. Olive oil is used in some foreign lighthouses; and at the Cape of Good Hope oil produced from the tails of Cape sheep is employed. It is said to be far superior to all other oils for its brilliancy in burning.

Attempts have been made to introduce the limelight, that being of far greater brilliancy than any other. We read of a curious experiment connected with it. A limelight was placed on the summit of a hill, called Slievesnaught, in Ireland, which was always enveloped in haze by day. Between it and the observing station was a church tower, twelve miles distant, and on this station an ordinary reflector was fixed, while the hill itself was seventy miles distant. Notwithstanding the great difference in the distances, the limelight was apparently much nearer and brighter than the light twelve miles off.

Great as are the difficulties of keeping up a continuous flame, they have been almost overcome by an arrangement introduced by Mr Renton, which preserves the cylinder of lime from cracking. Gas has lately been introduced in the lighthouse at Hartlepool. Hopes were entertained that electric lights might be introduced, but the great difficulty is to maintain an equable force, as the battery gradually declines in power. There are also other difficulties to be mastered. The most successful experiments have been carried on in the South Foreland lighthouse, by an arrangement of powerful magnets. The current thus produced passing through the carbon pillars, produces a splendid light, entirely eclipsing all other modes of illumination. Years ago a limelight was so arranged as to be used on board ship for illuminating objects at a great distance. By its means, an intended attack of torpedo vessels could be detected. It was employed also in the Abyssinian expedition, for illuminating the advance camp when there was a possibility of it being attacked by Theodore’s troops. Now, however, electric lights are used on board all the first-class men-of-war, incandescent lamps being fitted for internal use, and arc lights for signalling and searching purposes.