Plymouth Breakwater
Encyclopedia
Breakwater (structure)
Breakwaters are structures constructed on coasts as part of coastal defence or to protect an anchorage from the effects of weather and longshore drift.-Purposes of breakwaters:...
protecting Plymouth Sound
Plymouth Sound
Plymouth Sound, or locally just The Sound, is a bay at Plymouth in England.Its southwest and southeast corners are Penlee Point in Cornwall and Wembury Point on Devon, a distance of about 3 nautical miles . Its northern limit is Plymouth Hoe giving a north-south distance of nearly 3 nautical miles...
and the anchorages therein. It is 13 metres (42.7 ft) wide at the top and the base is 65 metres (213.3 ft). It lies in about 10 metres (32.8 ft) of water. Around 4 million tons of rock were used in its construction in 1812 at the then-colossal cost of £1.5 million (equivalent to £ today).
History
In 1806, as the Napoleonic WarsNapoleonic Wars
The Napoleonic Wars were a series of wars declared against Napoleon's French Empire by opposing coalitions that ran from 1803 to 1815. As a continuation of the wars sparked by the French Revolution of 1789, they revolutionised European armies and played out on an unprecedented scale, mainly due to...
impended, Lord St. Vincent
John Jervis, 1st Earl of St Vincent
Admiral of the Fleet John Jervis, 1st Earl of St Vincent GCB, PC was an admiral in the Royal Navy and Member of Parliament in the United Kingdom...
commissioned John Rennie
John Rennie (father)
John Rennie was a Scottish civil engineer who designed many bridges, canals, and docks.-Early years:Rennie, a farmer's younger son, was born at Phantassie, near East Linton, East Lothian, Scotland, and showed a taste for mechanics at a very early age, and was allowed to spend much time in the...
and Joseph Whidbey
Joseph Whidbey
Joseph Whidbey was a member of the Royal Navy who served on the Vancouver Expedition 1791–1795, and later achieved renown as a naval engineer. He is notable for having been the first European to discover and chart Admiralty Island in the Alexander Archipelago in 1794.Little is recorded of...
to plan a means of making Plymouth Bay a safe anchorage for the Channel Fleet
Channel Fleet
The Channel Fleet was the Royal Navy formation of warships that defended the waters of the English Channel from 1690 to 1909.-History:The Channel Fleet dates back at least to 1690 when its role was to defend England against the French threat under the leadership of Edward Russell, 1st Earl of...
. In 1811 came the order to begin construction; Whidbey was appointed Acting Superintending Engineer. This task required great engineering, organizational and political skills, as the many strictly technical challenges were complicated by the significant resources devoted to the project, from which various parties evidenced a desire for advantage. Nearly 4,000,000 (four million) tons of stone were quarried and transported, using about a dozen ships innovatively designed by the two engineers. A paper to the Royal Society
Royal Society
The Royal Society of London for Improving Natural Knowledge, known simply as the Royal Society, is a learned society for science, and is possibly the oldest such society in existence. Founded in November 1660, it was granted a Royal Charter by King Charles II as the "Royal Society of London"...
suggests that Whidbey found many fossils as a result of the quarrying necessary to the breakwater.
The foundation stone was laid on Shovel Rock August 8, 1812. It followed a line over Panther Rock, Shovel and St. Carlos Rocks, and was sufficiently completed by 1814 to shelter ships of the line. Napoleon was reported as commenting that the breakwater was a grand thing, as he passed by it on the way to exile on St. Helena in 1815.
Severe storm damage in 1817 and 1824 prompted a change in the profile and height. Whidbey continued to work on the breakwater and other engineering projects, including the breakwater's lighthouse (designed by Walker & Burgess for Trinity House
Trinity House
The Corporation of Trinity House of Deptford Strond is the official General Lighthouse Authority for England, Wales and other British territorial waters...
), until retirement around 1830. It was finished by 1841, the final work being finished by Rennie's son, Sir John Rennie. The lighthouse became operational in 1844, and soon afterwards a horse-drawn omnibus was driven from end to end, with a full complement of passengers and accompanied by a military band. A beacon was placed at the eastern end, consisting of a 6 feet (1.8 m) spherical cage on a 17 feet (5.2 m) pole; the cage was designed as a refuge for six shipwrecked sailors
Plymouth Breakwater Fort
In 1860, a Royal CommissionRoyal Commission on the Defence of the United Kingdom
In 1859 Lord Palmerston instigated the Royal Commission on the Defence of the United Kingdom because of serious concerns that France might attempt to invade the UK...
established by Lord Palmerston, produced a plan for the defence of Plymouth
Palmerston Forts, Plymouth
Several of the forts surrounding Plymouth were built as a result of a decision in Lord Palmerston's premiership to deter the French from attacking naval bases in the south of the country. The Royal Commission on the Defence of the United Kingdom reported in 1860 and resulted in a huge building...
and other Royal Dockyards
Royal Navy Dockyard
Royal Navy Dockyards are harbours where either commissioned ships are based, or where ships are overhauled and refitted. Historically, the Royal Navy maintained a string of dockyards around the world, although few are now operating today....
. The Breakwater Fort was designed to defend the entrances to Plymouth Sound
Plymouth Sound
Plymouth Sound, or locally just The Sound, is a bay at Plymouth in England.Its southwest and southeast corners are Penlee Point in Cornwall and Wembury Point on Devon, a distance of about 3 nautical miles . Its northern limit is Plymouth Hoe giving a north-south distance of nearly 3 nautical miles...
in conjunction with forts and batteries
Artillery battery
In military organizations, an artillery battery is a unit of guns, mortars, rockets or missiles so grouped in order to facilitate better battlefield communication and command and control, as well as to provide dispersion for its constituent gunnery crews and their systems...
on either shore. Designed by Captain Siborne, work on the oval masonry sea fort started in 1861 and the main structure was completed in 1865. It has its foundations on Shovel Rock and is 35 yards inside the Breakwater. After several changes in plan, the fort was finally armed in 1879 with fourteen 12.5-inch
RML 12.5 inch 38 ton gun
The RML 12.5 inch guns were large rifled muzzle-loading guns designed for British battleships and were also employed for coast defence.-Design:The gun originated from a desire for a longer 12-inch gun than the existing RML 12 inch 35 ton gun...
and four 10-inch rifled muzzle-loading guns
RML 10 inch 18 ton gun
The RML 10 inch guns Mk I - Mk II were large rifled muzzle-loading guns designed for British battleships and monitors. They were also fitted to the Bouncer-class flat-iron gunboats.-Design:...
in armoured casemate
Casemate
A casemate, sometimes rendered casement, is a fortified gun emplacement or armored structure from which guns are fired. originally a vaulted chamber in a fortress.-Origin of the term:...
s. Although the fort had been disarmed before World War I
World War I
World War I , which was predominantly called the World War or the Great War from its occurrence until 1939, and the First World War or World War I thereafter, was a major war centred in Europe that began on 28 July 1914 and lasted until 11 November 1918...
, it served as a signal station, and from 1937, an anti-aircraft
Anti-aircraft warfare
NATO defines air defence as "all measures designed to nullify or reduce the effectiveness of hostile air action." They include ground and air based weapon systems, associated sensor systems, command and control arrangements and passive measures. It may be to protect naval, ground and air forces...
training school. It was finally released by the military
Ministry of Defence (United Kingdom)
The Ministry of Defence is the United Kingdom government department responsible for implementation of government defence policy and is the headquarters of the British Armed Forces....
in 1976.
See also
- Harbor of Refuge, a comparable structure at the mouth of Delaware BayDelaware BayDelaware Bay is a major estuary outlet of the Delaware River on the Northeast seaboard of the United States whose fresh water mixes for many miles with the waters of the Atlantic Ocean. It is in area. The bay is bordered by the State of New Jersey and the State of Delaware...
in the United States, intended principally for civilian use.