Yehudi Lights
Yehudi lights are lamp (electrical component), lamps of automatically controlled brightness placed on the front and leading edges of an aircraft to raise the aircraft's luminance to the average brightness of the sky, a form of active camouflage using counter-illumination. They were designed to aircraft camouflage, camouflage the aircraft by preventing it from appearing as a dark object against the sky. The technology was developed by the US Navy from 1943 onwards, to enable a sea-search aircraft to approach a surfaced submarine to "within 30 seconds of flying time" before becoming visible to the submarine's crew. This in turn enabled the aircraft to engage the submarine with depth charges before it could dive, to counter the Battle of the Atlantic, threat from German submarines to allied shipping. The concept was based on earlier research by the Royal Canadian Navy in its diffused lighting camouflage project. Yehudi lights were unused in the war and were made obsolete by advance ...
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Yehudi Lights On Grumman TBM-3D Avenger
Yehudi or Jehudi (Hebrew: יהודי, endonym for Jew) is a common Hebrew name: * Yehudi Menuhin (1916–1999), violinist and conductor ** Yehudi Menuhin School, a music school in Surrey, England ** Who's Yehoodi?, a catchphrase referring to the violinist * Yehudi Wyner (born 1929), composer and pianist * Jehudi Ashmun (1794–1828), religious leader and social reformer Other uses * ''Yahudi'', a 1958 Indian film * Yehudi lights, camouflage system for World War II aircraft See also * Yahud (other) * Yehud (other) * Yehuda (other) * Yuda (other), / Juda (other) / Judah (other) * Jew (word) The English term ''Jew'' is originally derived from the Hebrew term '' Yehudi'' (), which passed into Greek as '' Ioudaios'' and into Latin as ''Iudaeus'', in turn evolving into the Old French term ''giu'' after the letter "d" was dropped. A v ...

Yehudi Menuhin
Yehudi Menuhin, Baron Menuhin (22 April 191612 March 1999), was an American-born British violinist and conductor who spent most of his performing career in Britain. He is widely considered one of the greatest violinists of the 20th century. He played the Soil Stradivarius, considered one of the finest violins made by Italian luthier Antonio Stradivari. Early life and career Yehudi Menuhin was born in New York City to Moshe Menuhin, a Lithuanian Jew from Gomel in modern Belarus, and Marutha, a Crimean Karaites, Crimean Karaite. Through his father Moshe, he was descended from a rabbinical dynasty. Moshe and Marutha (née Sher) met in the Mutasarrifate of Jerusalem (part of Palestine (region), historic Palestine under the Ottoman Empire) before marrying in New York in 1914. In late 1919, the pair became American citizens and changed the family name from Mnuchin to Menuhin. Menuhin's sisters were concert pianist and human rights activist Hephzibah Menuhin, Hephzibah, and pian ...
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B-24J-55-CO (cropped)
B- may refer to: *B-, a blood type *B- (grade), an academic grade *B − L In particle physics, ''B'' − ''L'' (pronounced "bee minus ell") is a quantum number which is the difference between the baryon number () and the lepton number () of a quantum system. Details This quantum number is the charge of ...

Depth Charge
A depth charge is an anti-submarine warfare (ASW) weapon designed to destroy submarine A submarine (often shortened to sub) is a watercraft capable of independent operation underwater. (It differs from a submersible, which has more limited underwater capability.) The term "submarine" is also sometimes used historically or infor ...s by detonating in the water near the target and subjecting it to a destructive shock factor, hydraulic shock. Most depth charges use high explosives with a fuze set to detonate the charge, typically at a specific depth from the surface. Depth charges can be dropped by ships (typically fast, agile surface combatants such as destroyers or frigates), patrol aircraft and helicopters. Depth charges were developed during World War I, and were one of the first viable methods of attacking a submarine underwater. They were widely used in World War I and World War II, and remained part of the anti-submarine arsenals of many navies during the Cold War, duri ...
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United States Army Air Force
The United States Army Air Forces (USAAF or AAF) was the major land-based aerial warfare service component of the United States Army and ''de facto'' aerial warfare service branch of the United States during and immediately after World War II (1941–1947). It was created on 20 June 1941 as successor to the previous United States Army Air Corps and is the direct predecessor of the United States Air Force, today one of the six United States Armed Forces, armed forces of the United States. The AAF was a component of the United States Army, which on 2 March 1942 was divided functionally by executive order into three autonomous forces: the Army Ground Forces, the United States Army Services of Supply (which in 1943 became the Army Service Forces), and the Army Air Forces. Each of these forces had a commanding general who reported directly to the Chief of Staff of the United States Army, Army Chief of Staff. The AAF administered all parts of military aviation formerly distributed am ...
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Photophores
A photophore is a specialized anatomical structure found in a variety of organisms that emits light through the process of Bioluminescence, boluminescence. This light may be produced endogenously by the organism itself (symbiotic) or generated through a mutualistic relationship with bioluminescent bacteria (non-symbiotic), resulting in light production on a glandular organ of animals. Light organs are most commonly found in marine animals, including many species of fish and cephalopods. The organ can be simple, or as complex as the human eye, equipped with lenses, shutters, color filters, and reflectors; unlike an eye, however, it is optimized to produce light, not absorb it. In the context of developmental biology, light organs form through precise genetic regulation and, in some cases, microbial colonization during specific stages of an organism's life cycle. They play a crucial evolutionary role in enabling species to adapt to low-light or dark environments, particularly i ...
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Abralia Veranyi
''Abralia veranyi'' is a species of squid in the family Enoploteuthidae. Common names include the eye-flash squid, Verany's enope squid and the midwater squid. It is found in the Atlantic Ocean and the Mediterranean Sea. It undergoes a daily vertical migration from deep waters to near the surface. Description The midwater squid is a small species with a mantle length of about . It has a fin, four pairs of arms and two long tentacles. The tips of the arms bear four rows of suckers and there are three hooks on the club of each tentacle. The male has the fourth arm on the left modified into a hectocotylus. This is used to store spermatophores and transfer them into the mantle of the female during mating. The underside of the squid bears about 550 light-producing organs called photophores. These are arranged in transverse rows each consisting of 4 to 6 large ones with many small ones in between. There are two large and three medium-sized photophores below each of the large eyes.
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Cephalopod
A cephalopod is any member of the molluscan Taxonomic rank, class Cephalopoda (Greek language, Greek plural , ; "head-feet") such as a squid, octopus, cuttlefish, or nautilus. These exclusively marine animals are characterized by bilateral symmetry, bilateral body symmetry, a prominent head, and a set of cephalopod arm, arms or tentacles (muscular hydrostats) modified from the primitive molluscan foot. Fishers sometimes call cephalopods "inkfish", referring to their common ability to squirt Cephalopod ink, ink. The study of cephalopods is a branch of malacology known as teuthology. Cephalopods became dominant during the Ordovician period, represented by primitive nautiloids. The class now contains two, only distantly related, Extant taxon, extant subclasses: Coleoidea, which includes octopuses, squid, and cuttlefish; and Nautiloidea, represented by ''Nautilus (genus), Nautilus'' and ''Allonautilus''. In the Coleoidea, the molluscan shell has been internalized or is absent, where ...
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Squid Counterillumination
A squid (: squid) is a mollusc with an elongated soft body, large eyes, eight arms, and two tentacles in the orders Myopsida, Oegopsida, and Bathyteuthida (though many other molluscs within the broader Neocoleoidea are also called ''squid'' despite not strictly fitting these criteria). Like all other cephalopods, squid have a distinct head, bilateral symmetry, and a mantle. They are mainly soft-bodied, like octopuses, but have a small internal skeleton in the form of a rod-like gladius or pen, made of chitin. Squid diverged from other cephalopods during the Jurassic and occupy a similar role to teleost fish as open-water predators of similar size and behaviour. They play an important role in the open-water food web. The two long tentacles are used to grab prey and the eight arms to hold and control it. The beak then cuts the food into suitable size chunks for swallowing. Squid are rapid swimmers, moving by jet propulsion, and largely locate their prey by sight. They are amo ...
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Second World War
World War II or the Second World War (1 September 1939 – 2 September 1945) was a World war, global conflict between two coalitions: the Allies of World War II, Allies and the Axis powers. World War II by country, Nearly all of the world's countries participated, with many nations mobilising all resources in pursuit of total war. Tanks in World War II, Tanks and Air warfare of World War II, aircraft played major roles, enabling the strategic bombing of cities and delivery of the Atomic bombings of Hiroshima and Nagasaki, first and only nuclear weapons ever used in war. World War II is the List of wars by death toll, deadliest conflict in history, causing World War II casualties, the death of 70 to 85 million people, more than half of whom were civilians. Millions died in genocides, including the Holocaust, and by massacres, starvation, and disease. After the Allied victory, Allied-occupied Germany, Germany, Allied-occupied Austria, Austria, Occupation of Japan, Japan, a ...
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Aircraft Camouflage
Aircraft camouflage is the use of military camouflage, camouflage on military aircraft to make them more difficult to see, whether on the ground or in the air. Given the possible backgrounds and lighting conditions, no single scheme works in every situation. A common approach has been a form of countershading, the aircraft being painted in a disruptive pattern of ground colours such as green and brown above, sky colours below. For faster and higher-flying aircraft, sky colours have sometimes been used all over, while helicopters and fixed-wing aircraft used close to the ground are often painted entirely in ground camouflage. Aircraft flying by night have often been painted black, but this actually made them appear darker than the night sky, leading to paler night camouflage schemes. There are trade-offs between camouflage and aircraft recognition markings, and between camouflage and weight. Accordingly, visible light camouflage has been dispensed with when air superiority was not ...
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Consolidated PBY-5A Catalina (cropped)
The Consolidated Model 28, more commonly known as the PBY Catalina (U.S. Navy designation), is a flying boat and amphibious aircraft designed by Consolidated Aircraft in the 1930s and 1940s. In U.S. Army service, it was designated as the OA-10 and in Canadian service as the Canso, and it later received the NATO reporting name Mop. It was one of the most widely used seaplanes of World War II. Catalinas served with every branch of the United States Armed Forces and in the air forces and navies of many other nations. The last military PBYs served until the 1980s. As of 2021, 86 years after its first flight, the aircraft continues to fly as a Aerial firefighting#Water bombers, waterbomber (or airtanker) in aerial firefighting operations in some parts of the world. Design and development Background The PBY was originally designed to be a Maritime patrol aircraft, patrol bomber, an aircraft with a long operational Range (aeronautics), range intended to locate and attack enemy ...
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