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Snorkel (swimming)
A snorkel is a device used for breathing atmospheric air when the wearer's head is face downwards in the surface water with the mouth and the nose submerged. It may be either a separate unit, or integrated into a swimming or diving mask. The integrated version is only suitable for surface snorkeling, while the separate device may also be used for surface breathing during breathhold underwater sports, underwater activities such as spearfishing, freediving, finswimming, underwater hockey, underwater rugby and for surface breathing while wearing scuba equipment. A standard snorkel is a curved tube with a shape usually resembling the letter "L" or "J", fitted with a mouthpiece (scuba), mouthpiece at the lower end and made from plastic, Synthetic rubber, synthetic elastomers, rubber, or light metal. The snorkel may have a loop or a clip to attach it to the head strap of the diving mask or swimming goggles, or may be tucked between the mask-strap and the head, or may be provided with it ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Diving Mask
A diving mask (also half mask, dive mask or scuba mask) is an item of diving equipment that allows Underwater diving, underwater divers, including scuba diving, scuba divers, free-diving, free-divers, and snorkeling, snorkelers, to see clearly underwater. Surface supplied diving, Surface supplied divers usually use a full face mask or diving helmet, but in some systems the half mask may be used. When the human eye is in direct contact with water as opposed to air, its normal environment, light entering the eye is refracted by a different angle and the eye is unable to Focus (optics), focus the light on the retina. By providing an air space in front of the eyes, the eye is able to focus nearly normally. The shape of the air space in the mask slightly affects the ability to focus. Corrective lenses can be fitted to the inside surface of the viewport or contact lenses may be worn inside the mask to allow normal vision for people with focusing defects. When the diver descends, the am ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tidal Volume
Tidal is the adjectival form of tide. Tidal may also refer to: * ''Tidal'' (album), a 1996 album by Fiona Apple * Tidal (king), a king involved in the Battle of the Vale of Siddim * TidalCycles TidalCycles (also known as Tidal) is a live coding environment which is designed for improvising and composing music. Technically, it is a domain-specific language embedded in the functional programming language Haskell, and is focused on the g ..., a live coding environment for music * Tidal (service), a music streaming service * '' Tidal: Occupy Theory, Occupy Strategy'', a magazine associated with the Occupy Wall Street movement See also * Tidal flow (traffic), the flow of traffic thought of as an analogy with the flow of tides * Tidal force, a secondary effect of the force of gravity and is responsible for the tides * Tidal power, energy harnessed by converting energy from tides * Tide (other) {{disambiguation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Flutter Valve
In respiratory medicine, a flutter valve (also Pneumostat valve, and Heimlich valve) is a one-way check valve used to prevent airflow back into a chest tube, and usually is applied to drain air from a pneumothorax. The design of the flutter valve features a rubber sleeve in a plastic case, where the rubber sleeve is arranged so that when air flows through the valve the sleeve opens and allows the outwards airflow from the body of the patient; however, when the airflow is reversed, the rubber sleeve closes and halts backwards airflow into the body of the patient. The construction of the flutter valve enables it to function as a one-way valve allowing airflow, or the flow of a fluid, in only one direction along the drainage tube. The end of the drainage tube is placed inside the chest cavity of the patient — into the air mass or into the fluid mass to be drained from the thorax. The flutter valve is placed in the appropriate orientation (designed so that the valve can only be c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Yves Le Prieur
Yves Paul Gaston Le Prieur (23 March 1885 – 1 June 1963) was an officer of the French Navy and an inventor. Adventures in the Far East Le Prieur followed his father in joining the French navy. As an officer he served in Asia and used traditional deep sea diving equipment. He studied Japanese and became sufficiently proficient to be promoted to military attaché and translator at the French embassy in Tokyo. While there he became the first Frenchman to earn a Black belt (martial arts), Black belt in judo, and the first person to take off in a plane, a Glider (aircraft), glider, from Japanese soil in 1909. The glider, named Le Prieur No. 2 after an earlier No. 1 unmanned prototype, was 7.2 m long, 7.0 m wide, and weighed 35 kg. The frame was made of Japanese bamboo, which was covered with calico. Le Prieur had designed the glider in collaboration with Shirou Aibara, a Lieutenant of the Japanese Navy, and Aikitsu Tanakadate, a professor at Tokyo Imperial University. The firs ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Louis De Corlieu
Louis Marie de Corlieu (born 23 November 1888 in Bourges; died 19 October 1967 or 1971) in Paris, was a French naval officer and inventor of the swimfin. Military service He served as Capitaine de corvette (lieutenant commander) in the French navy in the First World War. In 1925 he left the navy to study techniques for survival at sea. Invention of the swimfin After working as a hydrographer in the Belgian Congo from 1928 to 1933, he developed swimfins in 1933, patented them in Paris, and registered them in seven other countries. De Corlieu demonstrated his first prototype of a modern swimfin in front of an audience of officers which included Yves Le Prieur who invented an underwater breathing apparatus in 1926 to 1934. The combination of de Corlieu's fins with le Prieur's breathing apparatus in 1935 was a significant development towards the free-swimming scuba diver. In 1939, de Corlieu finally started mass production of his fins, which until then he had made in his apartment in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
La Croix-Valmer
La Croix-Valmer (; ) is a commune in the Var department in the Provence-Alpes-Côte d'Azur region in southeastern France. Geography La Croix-Valmer is at the foot of the Massif des Maures hills in the Bay of Cavalaire-sur-Mer, halfway between Le Lavandou and Saint-Tropez. History The Emperor Constantine the Great, on the way to wage war against his brother-in-law Maxentius in 312 AD, is said to have had a vision of a cross in the sky stating "in hoc signo vinces" (by this sign you will conquer) at the location where La Croix-Valmer is now situated. On April 16, 1893, a stone cross was erected on the site where tradition holds this vision occurred. La Croix-Valmer became a commune on 6 April 1934, separating from the commune of Gassin. The area has been inhabited since ancient times, as demonstrated by the discovery of remains such as prehistoric tools, cists, and the Roman farm of Pardigon (dating from the third century BC). During the Second World War, the beaches of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Leonardo Da Vinci
Leonardo di ser Piero da Vinci (15 April 1452 - 2 May 1519) was an Italian polymath of the High Renaissance who was active as a painter, draughtsman, engineer, scientist, theorist, sculptor, and architect. While his fame initially rested on his achievements as a painter, he has also become known for #Journals and notes, his notebooks, in which he made drawings and notes on a variety of subjects, including anatomy, astronomy, botany, cartography, painting, and palaeontology. Leonardo is widely regarded to have been a genius who epitomised the Renaissance humanism, Renaissance humanist ideal, and his List of works by Leonardo da Vinci, collective works comprise a contribution to later generations of artists matched only by that of his younger contemporary Michelangelo. Born out of wedlock to a successful notary and a lower-class woman in, or near, Vinci, Tuscany, Vinci, he was educated in Florence by the Italian painter and sculptor Andrea del Verrocchio. He began his career ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Skandalopetra
diving () dates from ancient Greece, when it was used by sponge fishermen, and has been re-discovered in recent years as a freediving discipline. It was in this discipline that the first world record in freediving was registered, when the Greek sponge fisherman Stathis Chantzis dived to a depth of 83 m (272 ft) in July 1913. It consists of a variable ballast dive using a tied to a rope. A companion on a boat recovers the diver by pulling the rope up after the descent, and keeps a watch on the diver from the surface. Origins A skandalopetra dive known to contemporary divers is that of Stathis Chantzis, a Greek sponge fisherman. On 14 July 1913, in the Karpathos port, Chantzis recovered the lost anchor of the Regina Margherita, a ship of the Italian Navy, at the depth of 83 m. His feat is considered the first depth record in apnea diving. The , or simply (), is a stone, usually of marble or granite, weighing between 8 and 14 kg, with rounded corners and hydrodynamic shape. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sponge Diving
Sponge diving is underwater diving to collect soft natural sponges for human use. Background Most sponges are too rough for general use due to their structural spicules composed of calcium carbonate or silica. But two genera, '' Hippospongia'' and '' Spongia'', have soft, entirely fibrous skeletons. These two genera are most commonly used by humans. It is unknown when exactly the sponge became an article of use. In Ancient Greek writings, Homer and Plato mentioned the sponge as an object used for bathing. Through trading, Europeans used soft sponges for many purposes including padding for helmets, portable drinking utensils and municipal water filters. Until the invention of synthetic sponges, they were used as cleaning tools, applicators for paints and ceramic glazes, and discreet contraceptives. However, by the mid-20th century, over-fishing had brought both the animals and the industry close to extinction. Many objects with sponge-like textures are now made of substances n ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Crete
Crete ( ; , Modern Greek, Modern: , Ancient Greek, Ancient: ) is the largest and most populous of the Greek islands, the List of islands by area, 88th largest island in the world and the List of islands in the Mediterranean#By area, fifth largest island in the Mediterranean Sea, after Sicily, Sardinia, Cyprus, and Corsica. Crete is located about south of the Peloponnese, and about southwest of Anatolia. Crete has an area of and a coastline of 1,046 km (650 mi). It bounds the southern border of the Aegean Sea, with the Sea of Crete (or North Cretan Sea) to the north and the Libyan Sea (or South Cretan Sea) to the south. Crete covers 260 km from west to east but is narrow from north to south, spanning three longitudes but only half a latitude. Crete and a number of islands and islets that surround it constitute the Region of Crete (), which is the southernmost of the 13 Modern regions of Greece, top-level administrative units of Greece, and the fifth most popu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Elephant
Elephants are the largest living land animals. Three living species are currently recognised: the African bush elephant ('' Loxodonta africana''), the African forest elephant (''L. cyclotis''), and the Asian elephant ('' Elephas maximus''). They are the only surviving members of the family Elephantidae and the order Proboscidea; extinct relatives include mammoths and mastodons. Distinctive features of elephants include a long proboscis called a trunk, tusks, large ear flaps, pillar-like legs, and tough but sensitive grey skin. The trunk is prehensile, bringing food and water to the mouth and grasping objects. Tusks, which are derived from the incisor teeth, serve both as weapons and as tools for moving objects and digging. The large ear flaps assist in maintaining a constant body temperature as well as in communication. African elephants have larger ears and concave backs, whereas Asian elephants have smaller ears and convex or level backs. Elephants are scatter ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Parts Of Animals
''Parts of Animals'' (or ''On the Parts of Animals''; Greek Περὶ ζῴων μορίων; Latin ''De Partibus Animalium'') is one of Aristotle's major texts on biology. It was written around 350 BC. The whole work is roughly a study in animal anatomy and physiology; it aims to provide a scientific understanding of the parts ( organs, tissues, fluids, etc.) of animals and asks whether these parts were designed or arose by chance. Chronology The treaty consists of four books whose authenticity has not been questioned, although its chronology is disputed. The consensus in placing it before the ''Generation of animals'' and perhaps later to ''History of animals''. There are indications that Aristotle placed this book at the beginning of his biological works. [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
