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HMS Comet (1822)
HMS ''Comet'', a wood-hulled paddle tug completed in 1822, was the first steam ship built for the Royal Navy. ''Comet'' was built at the yards in Deptford by Boulton, Watt & Co, which was at the time just outside London, in 1822. She was ordered as a tug, for towing ships out of harbour when the wind was not enough to allow them to move by themselves, specifically "to be employed in towing HM ships in the Thames and Medway". The ship was designed by Oliver Lang, the master shipwright at Woolwich Dockyard. She was fitted with a two-mast schooner rig, as well as a twin cylinder side-lever engine, which produced 80 nominal horsepower. Humphry Davy travelled on the Comet to Norway to test his zinc protectors for ships' copper bottoms in the summer of 1824. On 10 December 1868 ''Comet'' was ordered to be broken up in Portsmouth Dockyard His Majesty's Naval Base, Portsmouth (HMNB Portsmouth) is one of three operating bases in the United Kingdom for the Royal Navy (the others ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Comet Encke
Comet Encke , or Encke's Comet (official designation: 2P/Encke), is a periodic comet that completes an orbit of the Sun once every 3.3 years. (This is the shortest period of a reasonably bright comet; the faint main-belt comet 311P/PanSTARRS has a period of 3.2 years.) Encke was first recorded by Pierre Méchain on 17 January 1786, but it was not recognized as a periodic comet until 1819 when its orbit was computed by Johann Franz Encke. Like Halley's Comet, it is unusual in its being named after the calculator of its orbit rather than its discoverer. Like most comets, it has a very low albedo, reflecting only 4.6% of the light its comet nucleus, nucleus receives, although comets generate a large coma (cometary), coma and tail that can make them much more visible during their perihelion (closest approach to the Sun). The diameter of the nucleus of Encke's Comet is 4.8 km. Discovery As its official designation implies, Encke's Comet was the first periodic comet discovered af ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nominal Horsepower
Horsepower (hp) is a unit of measurement of power, or the rate at which work is done, usually in reference to the output of engines or motors. There are many different standards and types of horsepower. Two common definitions used today are the mechanical horsepower (or imperial horsepower), which is about 745.7 watts, and the metric horsepower, which is approximately 735.5 watts. The term was adopted in the late 18th century by Scottish engineer James Watt to compare the output of steam engines with the power of draft horses. It was later expanded to include the output power of other types of piston engines, as well as turbines, electric motors and other machinery. The definition of the unit varied among geographical regions. Most countries now use the SI unit watt for measurement of power. With the implementation of the EU Directive 80/181/EEC on 1 January 2010, the use of horsepower in the EU is permitted only as a supplementary unit. History The development of the steam ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tugboats Of The United Kingdom
A tugboat or tug is a marine vessel that manoeuvres other vessels by pushing or pulling them, with direct contact or a tow line. These boats typically tug ships in circumstances where they cannot or should not move under their own power, such as in crowded harbour or narrow canals, or cannot move at all, such as barges, disabled ships, log rafts, or oil platforms. Some are ocean-going, some are icebreakers or salvage tugs. Early models were powered by steam engines, long ago superseded by diesel engines. Many have deluge gun water jets, which help in firefighting, especially in harbours. Types Seagoing Seagoing tugs (deep-sea tugs or ocean tugboats) fall into four basic categories: #The standard seagoing tug with model bow that tows almost exclusively by way of a wire cable. In some rare cases, such as some USN fleet tugs, a synthetic rope hawser may be used for the tow in the belief that the line can be pulled aboard a disabled ship by the crew owing to its lightn ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ships Of The Royal Navy
''Ships of the Royal Navy'' is a naval history reference work by J. J. Colledge (1908–1997); it provides brief entries on all recorded ships in commission in the Royal Navy from the 15th century, giving location of constructions, date of launch, tonnage, specification and fate. It was published in two volumes by Greenhill Books. Volume 1, first published in 1969, covers major ships; Volume 2, first published in 1970, covers Navy-built trawlers, drifters, tugs and requisitioned ships including Armed Merchant Cruisers. The book is the standard single-volume reference work on ships of the Royal Navy, and Colledge's conventions and spellings of names are used by museums, libraries and archives. For more data on ships of the pre-1863 Royal Navy, see ''British Warships in the Age of Sail''. A revised third version of the Volume 1 work was published in 2003 which added the ships of the late 20th century. The revision was conducted by Ben Warlow. A fourth edition was publishe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Portsmouth Dockyard
His Majesty's Naval Base, Portsmouth (HMNB Portsmouth) is one of three operating bases in the United Kingdom for the Royal Navy (the others being HMNB Clyde and HMNB Devonport). Portsmouth Naval Base is part of the city of Portsmouth; it is located on the eastern shore of Portsmouth Harbour, north of the Solent and the Isle of Wight. Until the early 1970s, it was officially known as Portsmouth Royal Dockyard (or HM Dockyard, Portsmouth); thereafter the term 'Naval Base' gained currency, acknowledging a greater focus on personnel and support elements alongside the traditional emphasis on building, repairing and maintaining ships. In 1984 Portsmouth's Royal Dockyard function was downgraded and it was formally renamed the 'Fleet Maintenance and Repair Organisation' (FMRO). The FMRO was privatized in 1998, and for a time (from 2002 to 2014), shipbuilding, in the form of block construction, returned. Around 2000, the designation HMS ''Nelson'' (which until then had been specific to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cathodic Protection
Cathodic protection (CP; ) is a technique used to control the corrosion of a metal surface by making it the cathode of an electrochemical cell. A simple method of protection connects the metal to be protected to a more easily corroded "sacrificial metal" to act as the anode. The sacrificial metal then corrodes instead of the protected metal. For structures such as long pipelines, where passive galvanic cathodic protection is not adequate, an external DC electrical power source is used to provide sufficient current. Cathodic protection systems protect a wide range of metallic structures in various environments. Common applications are: steel water or fuel pipelines and steel storage tanks such as home water heaters; steel pier piles; ship and boat hulls; offshore oil platforms and onshore oil well casings; offshore wind farm foundations and metal reinforcement bars in concrete buildings and structures. Another common application is in galvanized steel, in which a sacrif ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Norway
Norway, officially the Kingdom of Norway, is a Nordic country in Northern Europe, the mainland territory of which comprises the western and northernmost portion of the Scandinavian Peninsula. The remote Arctic island of Jan Mayen and the archipelago of Svalbard also form part of Norway. Bouvet Island, located in the Subantarctic, is a dependency of Norway; it also lays claims to the Antarctic territories of Peter I Island and Queen Maud Land. The capital and largest city in Norway is Oslo. Norway has a total area of and had a population of 5,425,270 in January 2022. The country shares a long eastern border with Sweden at a length of . It is bordered by Finland and Russia to the northeast and the Skagerrak strait to the south, on the other side of which are Denmark and the United Kingdom. Norway has an extensive coastline, facing the North Atlantic Ocean and the Barents Sea. The maritime influence dominates Norway's climate, with mild lowland temperatures on the se ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Humphry Davy
Sir Humphry Davy, 1st Baronet, (17 December 177829 May 1829) was a British chemist and inventor who invented the Davy lamp and a very early form of arc lamp. He is also remembered for isolating, by using electricity, several elements for the first time: potassium and sodium in 1807 and calcium, strontium, barium, magnesium and boron the following year, as well as for discovering the elemental nature of chlorine and iodine. Davy also studied the forces involved in these separations, inventing the new field of electrochemistry. Davy is also credited to have been the first to discover clathrate hydrates in his lab. In 1799 he experimented with nitrous oxide and was astonished at how it made him laugh, so he nicknamed it "laughing gas" and wrote about its potential anaesthetic properties in relieving pain during surgery. Davy was a baronet, President of the Royal Society (PRS), Member of the Royal Irish Academy (MRIA), Fellow of the Geological Society (FGS), and a member ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Side-lever Engine
A marine steam engine is a steam engine that is used to power a ship or boat. This article deals mainly with marine steam engines of the reciprocating type, which were in use from the inception of the steamboat in the early 19th century to their last years of large-scale manufacture during World War II. Reciprocating steam engines were progressively replaced in marine applications during the 20th century by steam turbines and marine diesel engines. History The first commercially successful steam engine was developed by Thomas Newcomen in 1712. The steam engine improvements brought forth by James Watt in the later half of the 18th century greatly improved steam engine efficiency and allowed more compact engine arrangements. Successful adaptation of the steam engine to marine applications in England would have to wait until almost a century after Newcomen, when Scottish engineer William Symington built the world's "first practical steamboat", the ''Charlotte Dundas'', in 1802. Riv ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Deptford Dockyard
Deptford Dockyard was an important naval dockyard and base at Deptford on the River Thames, operated by the Royal Navy from the sixteenth to the nineteenth centuries. It built and maintained warships for 350 years, and many significant events and ships have been associated with it. Founded by Henry VIII in 1513, the dockyard was the most significant royal dockyard of the Tudor period and remained one of the principal naval yards for three hundred years. Important new technological and organisational developments were trialled here, and Deptford came to be associated with the great mariners of the time, including Francis Drake and Walter Raleigh. The yard expanded rapidly throughout the sixteenth and seventeenth centuries, encompassing a large area and serving for a time as the headquarters of naval administration, and the associated Victualling Yard became the Victualling Board's main depot. Tsar Peter the Great visited the yard officially incognito in 1698 to learn shipbuildi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Schooner Rig
A schooner () is a type of sailing vessel defined by its rig: fore-and-aft rigged on all of two or more masts and, in the case of a two-masted schooner, the foremast generally being shorter than the mainmast. A common variant, the topsail schooner also has a square topsail on the foremast, to which may be added a topgallant. Differing definitions leave uncertain whether the addition of a fore course would make such a vessel a brigantine. Many schooners are gaff-rigged, but other examples include Bermuda rig and the staysail schooner. The origins of schooner rigged vessels is obscure, but there is good evidence of them from the early 17th century in paintings by Dutch marine artists. The name "schooner" first appeared in eastern North America in the early 1700s. The name may be related to a Scots word meaning to skip over water, or to skip stones. The schooner rig was used in vessels with a wide range of purposes. On a fast hull, good ability to windward was useful for privat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Woolwich Dockyard
Woolwich Dockyard (formally H.M. Dockyard, Woolwich, also known as The King's Yard, Woolwich) was an English Royal Navy Dockyard, naval dockyard along the river Thames at Woolwich in north-west Kent, where many ships were built from the early 16th century until the late 19th century. William Camden called it 'the Mother Dock of all England'. By virtue of the size and quantity of vessels built there, Woolwich Dockyard is described as having been 'among the most important shipyards of seventeenth-century Europe'. During the Age of Sail, the yard continued to be used for shipbuilding and repair work more or less consistently; in the 1830s a specialist factory within the dockyard oversaw the introduction of Steamship, steam power for ships of the Royal Navy. At its largest extent it filled a 56-acre site north of Woolwich Church Street, between Warspite Road and New Ferry Approach; 19th-century naval vessels were fast outgrowing the yard, however, and it eventually closed in 1869 (th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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