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HMS Tourmaline (1875)
HMS ''Tourmaline'' was a composite screw corvette that served in the Victorian Royal Navy. The ''Emerald'' class was a development of the wooden but combined an iron frame and teak cladding. Launched in 1875, ''Tourmaline'' was deployed to the North America and West Indies Station in 1878. The ship joined the third flying squadron in 1880, sailing to South Africa at time of the First Boer War and then to Australia, Japan, Singapore and Egypt, arriving in Alexandria in time to participate in the Anglo-Egyptian War. During 1883, the corvette was stationed in Zanzibar and then, in response to the Franco-Hova Wars, was the senior officer's ship in Madagascar. Following an armament upgrade, the vessel returned to the North America and West Indies Station in 1886. Converted to a coal hulk in 1899, ''Tourmaline'' was sold in 1920 to be broken up. Design and development The was a class of composite screw corvettes designed by Nathaniel Barnaby for the Royal Navy. The ships w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tourmaline
Tourmaline ( ) is a crystalline silicate mineral group in which boron is compounded with elements such as aluminium, iron, magnesium, sodium, lithium, or potassium. Tourmaline is a gemstone and can be found in a wide variety of colors. The term is derived from the Sinhalese "tōramalli", which refers to the carnelian gemstones. History Brightly colored Ceylonese gem tourmalines were brought to Europe in great quantities by the Dutch East India Company to satisfy a demand for curiosities and gems. Tourmaline was sometimes called the "Ceylonese Magnet" because it could attract and then repel hot ashes due to its pyroelectric properties. Tourmalines were used by chemists in the 19th century to polarize light by shining rays onto a cut and polished surface of the gem. Species and varieties Commonly encountered species and varieties: Schorl species: : Brownish black to black—''schorl'', Dravite species: from the Drave district of Carinthia : Dark yellow to brownish blac ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Flying Squadron (United Kingdom)
The Flying Squadron was a Royal Navy squadron formed at least three times. Its first formation existed from June 1869-November 1870. First formation, 1869-70 The first Flying Squadron was established in 1869. It was made up, at various times, of ten wooden ships with auxiliary steam power. The squadron sailed from Plymouth on 19 June 1869. It called at Madeira, South America, South Africa, Melbourne, Sydney, and Hobart in Australia, Auckland, Wellington, and Lyttleton in New Zealand, Japan, Canada Hawaii, and Bahia in Brazil, before returning to England on 15 November 1870.https://www.pdavis.nl/Flying.htm, accessed April 2020. Rear-Admiral Geoffrey Hornby commanded the squadron from 19 June 1869 – 15 November 1870, flying his flag from . Other ships of the squadron included , (left at Bahia), , (left at Esquimalt), , , , and . Between 1866 and 1870, served in the Pacific with the Commander-in-Chief, China. She joined the Flying Squadron at Valparaiso in Chile, sailing ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
RML 64-pounder 64 Cwt Gun
The RML 64-pounder 64 cwt gun was a Rifled, Muzzle Loading (RML) naval, field or fortification artillery gun manufactured in England in the 19th century, which fired a projectile weighing approximately . "64 cwt" refers to the gun's weight rounded up to differentiate it from other "64-pounder" guns. Description The calibre of 6.3 inches was chosen to enable it to fire remaining stocks of spherical shells originally made for the obsolete 32 pounder guns if necessary. Mark I (adopted in 1864) and Mark II (adopted 1866) guns, and Mark III guns made from 1867 – April 1871 had wrought-iron inner "A" tubes surrounded by wrought-iron coils. Mark III guns made after April 1871 were built with toughened mild steel "A" tubes, and earlier Mark III guns were re-tubed with steel and were classified as a siege gun in land service. Remaining guns with iron tubes were used for sea service.Treatise on Construction and Manufacture of Service Ordnance, 1879, pages 292, 261-265 Rifling o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Displacement (ship)
The displacement or displacement tonnage of a ship is its weight. As the term indicates, it is measured indirectly, using Archimedes' principle, by first calculating the volume of water displaced by the ship, then converting that value into weight. Traditionally, various measurement rules have been in use, giving various measures in long tons. Today, tonnes are more commonly used. Ship displacement varies by a vessel's degree of load, from its empty weight as designed (known as "lightweight tonnage") to its maximum load. Numerous specific terms are used to describe varying levels of load and trim, detailed below. Ship displacement should not be confused with measurements of volume or capacity typically used for commercial vessels and measured by tonnage: net tonnage and gross tonnage. Calculation The process of determining a vessel's displacement begins with measuring its draft.George, 2005. p.5. This is accomplished by means of its "draft marks" (or "load lines"). A mer ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Draft (hull)
The draft or draught of a ship's hull is the vertical distance between the waterline and the bottom of the hull (keel). The draught of the vessel is the maximum depth of any part of the vessel, including appendages such as rudders, propellers and drop keels if deployed. Draft determines the minimum depth of water a ship or boat can safely navigate. The related term air draft is the maximum height of any part of the vessel above the water. The more heavily a vessel is loaded, the deeper it sinks into the water, and the greater its draft. After construction, the shipyard creates a table showing how much water the vessel displaces based on its draft and the density of the water (salt or fresh). The draft can also be used to determine the weight of cargo on board by calculating the total displacement of water, accounting for the content of the ship's bunkers, and using Archimedes' principle. The closely related term "trim" is defined as the difference between the forward and aft ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Beam (nautical)
The beam of a ship is its width at its widest point. The maximum beam (BMAX) is the distance between planes passing through the outer extremities of the ship, beam of the hull (BH) only includes permanently fixed parts of the hull, and beam at waterline (BWL) is the maximum width where the hull intersects the surface of the water. Generally speaking, the wider the beam of a ship (or boat), the more initial stability it has, at the expense of secondary stability in the event of a capsize, where more energy is required to right the vessel from its inverted position. A ship that heels on her ''beam ends'' has her deck beams nearly vertical. Typical values Typical length-to-beam ratios ( aspect ratios) for small sailboats are from 2:1 (dinghies to trailerable sailboats around ) to 5:1 (racing sailboats over ). Large ships have widely varying beam ratios, some as large as 20:1. Rowing shells designed for flatwater racing may have length to beam ratios as high as 30:1, while a cor ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Length Between Perpendiculars
Length between perpendiculars (often abbreviated as p/p, p.p., pp, LPP, LBP or Length BPP) is the length of a ship along the summer load line from the forward surface of the stem, or main bow perpendicular member, to the after surface of the sternpost, or main stern perpendicular member. When there is no sternpost, the centerline axis of the rudder stock is used as the aft end of the length between perpendiculars. Measuring to the stern post or rudder stock was believed to give a reasonable idea of the ship's carrying capacity, as it excluded the small, often unusable volume contained in her overhanging ends. On some types of vessels this is, for all practical purposes, a waterline measurement. In a ship with raked stems, naturally that length changes as the draught of the ship changes, therefore it is measured from a defined loaded condition. See also * Length overall __NOTOC__ Length overall (LOA, o/a, o.a. or oa) is the maximum length of a vessel's hull measured para ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cruiser
A cruiser is a type of warship. Modern cruisers are generally the largest ships in a fleet after aircraft carriers and amphibious assault ships, and can usually perform several roles. The term "cruiser", which has been in use for several hundred years, has changed its meaning over time. During the Age of Sail, the term ''cruising'' referred to certain kinds of missions—independent scouting, commerce protection, or raiding—fulfilled by frigates or sloops-of-war, which functioned as the ''cruising warships'' of a fleet. In the middle of the 19th century, ''cruiser'' came to be a classification of the ships intended for cruising distant waters, for commerce raiding, and for scouting for the battle fleet. Cruisers came in a wide variety of sizes, from the medium-sized protected cruiser to large armored cruisers that were nearly as big (although not as powerful or as well-armored) as a pre-dreadnought battleship. With the advent of the dreadnought battleship before World W ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nathaniel Barnaby
Sir Nathaniel Barnaby, (25 February 1829 – 16 June 1915) was Chief Constructor of the Royal Navy from 1872 to 1885. Biography Born on 25 February 1829 in Chatham, Barnaby began his career as a naval apprentice at Sheerness in 1843. He won a scholarship to Portsmouth Naval School in 1848. On qualifying in 1852, he became a draughtsman at Woolwich dockyard. He was invited to join the Department of Naval Construction in 1854 to take part in designing the first British ironclad warship, HMS ''Warrior''. Sir Edward Reed became Chief Constructor in 1863. He was married to Barnaby's sister, and he made Barnaby head of his staff. In this post, he worked on the majority of British warships, up to the time of HMS ''Monarch''. When Reed retired in 1872, Barnaby was elevated to "President of the Council of Construction and Chief Naval Architect." Always referred to as the "Chief Constructor," the title was changed in 1875 to "Director of Naval Construction" (DNC). Nathaniel Barnaby ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Coal Hulk
A hulk is a ship that is afloat, but incapable of going to sea. Hulk may be used to describe a ship that has been launched but not completed, an abandoned wreck or shell, or to refer to an old ship that has had its rigging or internal equipment removed, retaining only its buoyant qualities. The word hulk also may be used as a verb: a ship is "hulked" to convert it to a hulk. The verb was also applied to crews of Royal Navy ships in dock, who were sent to the receiving ship for accommodation, or "hulked". Hulks have a variety of uses such as housing, prisons, salvage pontoons, gambling sites, naval training, or cargo storage. In the days of sail, many hulls served longer as hulks than they did as functional ships. Wooden ships were often hulked when the hull structure became too old and weak to withstand the stresses of sailing. More recently, ships have been hulked when they become obsolete or when they become uneconomical to operate. Sheer hulk A sheer hulk (or shear hulk) wa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Franco-Hova Wars
The Franco-Hova Wars, also known as the Franco-Malagasy Wars were two French military interventions in Madagascar between 1883 and 1896 that overthrew the ruling monarchy of the Merina Kingdom, and resulted in Madagascar becoming a French colony. The term " Hova" referred to a social class within the Merina class structure. Background Ever since the arrival of European powers to Madagascar, the United Kingdom and France both developed ambitions to control Madagascar, a rich island with strategic importance in regard to the sea passage to India. Despite this, the Merina Kingdom of Madagascar had steadfastly managed to maintain its independence during the 19th century. Defense of the island was aided by its size and diversity of terrain, the nation's organized military and government structures, and the prevalence of tropical diseases, which often proved deadly to Europeans. The first significant European influence in Imerina was the arrival of a handful of British missionaries ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sultanate Of Zanzibar
The Sultanate of Zanzibar ( sw, Usultani wa Zanzibar, ar, سلطنة زنجبار , translit=Sulṭanat Zanjībār), also known as the Zanzibar Sultanate, was a state controlled by the Sultan of Zanzibar, in place between 1856 and 1964. The Sultanate's territories varied over time, and at their greatest extent spanned all of present-day Kenya and the Zanzibar Archipelago off the Swahili Coast. After a decline, the state had sovereignty over only the archipelago and a strip along the Kenyan coast, with the interior of Kenya constituting the British Kenya Colony and the coastal strip administered as a ''de facto'' part of that colony. Under an agreement reached on 8 October 1963, the Sultan of Zanzibar relinquished sovereignty over his remaining territory on the mainland, and on 12 December 1963, Kenya officially obtained independence from the British. On 12 January 1964, Jamshid bin Abdullah, the last sultan, was deposed and lost sovereignty over the last of his dominions, Z ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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