It is the prototype of all lighthouses in the world.
Neuwerk, containing some marshland protected by dikes, has two lighthouses and a lifeboat station.
On the Ness two lighthouses have been built at different levels, the lights of which are visible at 13 and 16 m.
The difficulty of connecting lightships and isolated lighthouses to the mainland by submarine cables, owing to the destructive action of the tides and waves on rocky coasts on the wll- shore ends, led many inventors to look for a way out of the difficulty by the adoption of some form of inductive Smith.
Stevenson, who in 1892 advocated the use of the inductive system pure and simple for communication between the mainland and isolated lighthouses or islands.
Sand bars keep filling up the mouths of these channels, necessitating frequent dredging and extension of the breakwaters, work undertaken by the Federal government, which also maintains a most comprehensive and completeystem of aids to navigation, including lighthouses and lightships, fog alarms, gas and other buoys, life-saving, storm signal and weather report stations.
He often accompanied his father on his official visits to the lighthouses of the Scottish coast and on longer journeys, thus early accustoming himself to travel.
He took up the question of lighthouses and harbours; in the former he secured greater efficiency, in the latter he prevented useless expenditure.
Until the Civil War he was engaged in various engineering works, mainly in connexion with lighthouses, and later as a captain of topographical engineers in the survey of the northern lakes.
The railways, lighthouses, gas and waterworks and other concessions and industries were placed in British hands.
This fact having been fully demonstrated, acetylene dissolved in this way was exempted from the Explosives Act, and consequently upon this exemption a large business has grown up in the preparation and use of dissolved acetylene for lighting motor omnibuses, motor cars, railway carriages, lighthouses, buoys, yachts, &c., for which it is particularly adapted.
It also deals with the accounts of harbours, lighthouses and mercantile marine offices, and of the merchant seamen's fund, and with the consuls' accounts for disabled seamen abroad.
The isle is surrounded by shoals, and high-level and low-level lighthouses have been erected, the one at the north-west and the other at the north-east corner.
So popular has it become that besides being used for massive constructions like breakwaters, dock walls, culverts, and for foundations of buildings, lighthouses and bridges, it is also proving its usefulness to the architect and engineer in many other ways.
It has a good harbour (in which there are three lighthouses), considerable coastwise trade, and important oyster fisheries.
The entrance to the port is free from ice nearly all the year round, is excellently buoyed, and lighted by two lightships and eight lighthouses, among the latter the remarkable Rothesand Leuchtturm, erected 1884-1885.
Population 250, consisting chiefly of the keepers of the numerous lighthouses erected by the Canadian government.
Railways, telegraphs, lighthouses, the harbour works at Suez, the breakwater at Alexandria, were carried out by some of the best contractors of Europe.
Lighthouses exist on one of the Quwain group of islands off Ras Musandam and on Tunb I.; light-buoys have been placed at Bushire in the outer and inner anchorages, at Bahrein and on the Shatt al 'Arab bar.
In 1819 he was nominated a commissioner of lighthouses, for which he was the first to construct compound lenses as substitutes for mirrors.
His scientific work was chiefly concerned with galvanism and its medical applications, with the construction and illumination of lighthouses, and with experiments for preserving human life and material objects from destruction by fire.
The normal annual expenditure amounts to about L56,000, while 24,000 is generally allotted to extraordinary works, such as new cuttings, &c. Between 1857 and 1905 a sum of about one and three quarter millions sterling was spent on engineering works, including the construction of quays, lighthouses, workshops and buildings, &c. Sulina from being a collection of mud hovels has developed into a town with 5000 inhabitants; a well-found hospital has been established where all merchant sailors receive gratuitous treatment; lighthouses, quays, floating elevators and an efficient pilot service all combine to make it a first-class port.
With flat and shelving shores, the shoal-banks off the main mouths of the delta form the chief danger to shipping, and this is guarded against by a good service of lighthouses and lightships.