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Keraunography or keranography is the belief that lightning, when striking an object (generally a human body), can leave markings which constitute a photographic image of surrounding objects. It is generally considered a myth: lightning can leave markings, but they are not photographic.
Like most folklore, it is impossible to trace the origins of keraunography. However, it seems to have attracted scientific and media attention in England in the early 19th century, and by Victorian times the term "keraunography" had been coined to describe numerous unconnected events. With increasing scientific understanding of electricity and the popularity of photography, the time was right in the 19th century for keraunography, which seems to combine both concepts, to enter the public consciousness.[ original research? ] However, it is likely that anecdotal accounts of keraunography had existed long before there was a word for it.
Lightning, being a dramatic and often-seen (yet mysterious and poorly understood) aspect of nature, has since ancient times been the subject of mythology and folklore regarding its origins, effects, and various ways to ward it off. As mentioned previously, the 19th century were a breeding ground for myths about electricity and photography. Sympsychography, by which brain waves are used to produce a photographic image, was a deliberate joke, but no less taken as truth by members of the public. Also possibly related to keraunography is the mistaken belief that the last image a dying person sees is burned into their retina, like a photograph taken at the time of death.
Although to some degree science has still not fully explained all the behaviours of lightning, very few people currently accept keraunography as truth. It is evident that lightning strikes do indeed produce burn marks, and like any basically random shape (clouds, birthmarks, inkblots, etc.) it is human nature to see shapes in them. The lightning often leaves skin marks in characteristic Lichtenberg figures, sometimes called lightning flowers; they may persist for hours or days, and are a useful indicator for medical examiners when trying to determine the cause of death. Although humans being struck by lightning is of course rare, it is nonetheless possible that over a wide period of time, certain cases of burn marks would exist which could be said to resemble objects nearby the point of the lightning strike. However, these cases are almost certainly the product of coincidence rather than evidence of any photographic property of lightning. No supposed case of keraunography has been investigated by modern science, and unless further evidence is presented, it remains a strange object of 19th-century British folklore.
Keraunographic markings (also known as Lichtenberg figures or ferning patterns) are signs of a lightning strike injury on the skin. [1] [2] They can appear on a number of other materials, including wood and grass. [3]
A vampire is a mythical creature that subsists by feeding on the vital essence of the living. In European folklore, vampires are undead humanoid creatures that often visited loved ones and caused mischief or deaths in the neighbourhoods which they inhabited while they were alive. They wore shrouds and were often described as bloated and of ruddy or dark countenance, markedly different from today's gaunt, pale vampire which dates from the early 19th century. Vampiric entities have been recorded in cultures around the world; the term vampire was popularized in Western Europe after reports of an 18th-century mass hysteria of a pre-existing folk belief in Southeastern and Eastern Europe that in some cases resulted in corpses being staked and people being accused of vampirism. Local variants in Southeastern Europe were also known by different names, such as shtriga in Albania, vrykolakas in Greece and strigoi in Romania, cognate to Italian 'Strega', meaning Witch.
In folklore, a werewolf, or occasionally lycanthrope is an individual who can shape-shift into a wolf, either purposely or after being placed under a curse or affliction, with the transformations occurring on the night of a full moon. Early sources for belief in this ability or affliction, called lycanthropy, are Petronius (27–66) and Gervase of Tilbury (1150–1228).
Lightning is a natural phenomenon formed by electrostatic discharges through the atmosphere between two electrically charged regions, either both in the atmosphere or one in the atmosphere and one on the ground, temporarily neutralizing these in a near-instantaneous release of an average of between 200 megajoules and 7 gigajoules of energy, depending on the type. This discharge may produce a wide range of electromagnetic radiation, from heat created by the rapid movement of electrons, to brilliant flashes of visible light in the form of black-body radiation. Lightning causes thunder, a sound from the shock wave which develops as gases in the vicinity of the discharge experience a sudden increase in pressure. Lightning occurs commonly during thunderstorms as well as other types of energetic weather systems, but volcanic lightning can also occur during volcanic eruptions. Lightning is an atmospheric electrical phenomenon and contributes to the global atmospheric electrical circuit.
Thunder is the sound caused by lightning. Depending upon the distance from and nature of the lightning, it can range from a long, low rumble to a sudden, loud crack. The sudden increase in temperature and hence pressure caused by the lightning produces rapid expansion of the air in the path of a lightning bolt. In turn, this expansion of air creates a sonic shock wave, often referred to as a "thunderclap" or "peal of thunder". The scientific study of thunder is known as brontology and the irrational fear (phobia) of thunder is called brontophobia.
Ball lightning is a rare and unexplained phenomenon described as luminescent, spherical objects that vary from pea-sized to several meters in diameter. Though usually associated with thunderstorms, the observed phenomenon is reported to last considerably longer than the split-second flash of a lightning bolt, and is a phenomenon distinct from St. Elmo's fire.
An electrical injury, or electrical shock is damage sustained to the skin or internal organs on direct contact with an electric current.
A burn is an injury to skin, or other tissues, caused by heat, cold, electricity, chemicals, friction, or ultraviolet radiation. Most burns are due to heat from hot liquids, solids, or fire. Burns occur mainly in the home or the workplace. In the home, risks are associated with domestic kitchens, including stoves, flames, and hot liquids. In the workplace, risks are associated with fire and chemical and electric burns. Alcoholism and smoking are other risk factors. Burns can also occur as a result of self-harm or violence between people (assault).
Electrocution is death or severe injury caused by electric shock from electric current passing through the body. The word is derived from "electro" and "execution", but it is also used for accidental death.
A Lichtenberg figure, or Lichtenberg dust figure, is a branching electric discharge that sometimes appears on the surface or in the interior of insulating materials. Lichtenberg figures are often associated with the progressive deterioration of high voltage components and equipment. The study of planar Lichtenberg figures along insulating surfaces and 3D electrical trees within insulating materials often provides engineers with valuable insights for improving the long-term reliability of high-voltage equipment. Lichtenberg figures are now known to occur on or within solids, liquids, and gases during electrical breakdown.
An injury is any physiological damage to living tissue caused by immediate physical stress. Injuries to humans can occur intentionally or unintentionally and may be caused by blunt trauma, penetrating trauma, burning, toxic exposure, asphyxiation, or overexertion. Injuries can occur in any part of the body, and different symptoms are associated with different injuries.
High voltage electricity refers to electrical potential large enough to cause injury or damage. In certain industries, high voltage refers to voltage above a certain threshold. Equipment and conductors that carry high voltage warrant special safety requirements and procedures.
A lightning strike or lightning bolt is a lightning event in which the electric discharge takes place between the atmosphere and the ground. Most originate in a cumulonimbus cloud and terminate on the ground, called cloud-to-ground (CG) lightning. A less common type of strike, ground-to-cloud (GC) lightning, is upward-propagating lightning initiated from a tall grounded object and reaching into the clouds. About 25% of all lightning events worldwide are strikes between the atmosphere and earth-bound objects. Most are intracloud (IC) lightning and cloud-to-cloud (CC), where discharges only occur high in the atmosphere. Lightning strikes the average commercial aircraft at least once a year, but modern engineering and design means this is rarely a problem. The movement of aircraft through clouds can even cause lightning strikes.
According to spiritual beliefs, an aura or energy field is a colored emanation said to enclose a human body or any animal or object. In some esoteric positions, the aura is described as a subtle body. Psychics and holistic medicine practitioners often claim to have the ability to see the size, color and type of vibration of an aura.
Photographic magnitude is a measure of the relative brightness of a star or other astronomical object as imaged on a photographic film emulsion with a camera attached to a telescope. An object's apparent photographic magnitude depends on its intrinsic luminosity, its distance and any extinction of light by interstellar matter existing along the line of sight to the observer.
A thunderstone is a prehistoric hand axe, stone tool, or fossil which was used as an amulet to protect a person or a building. The name derives from the ancient belief that the object was found at a place where lightning had struck.
Truth claim, in photography, is a term Tom Gunning uses to describe the prevalent belief that traditional photographs accurately depict reality. He states that the truth claim relies on both the indexicality and visual accuracy of photographs.
A lightning rod or lightning conductor is a metal rod mounted on a structure and intended to protect the structure from a lightning strike. If lightning hits the structure, it is most likely to strike the rod and be conducted to ground through a wire, rather than passing through the structure, where it could start a fire or cause electrocution. Lightning rods are also called finials, air terminals, or strike termination devices.
Myth is a genre of folklore consisting primarily of narratives that play a fundamental role in a society. For scholars, this is very different from the vernacular usage of the term "myth" that refers to a belief that is not true. Instead, the veracity of a myth is not a defining criterion.
An electrical burn is a burn that results from electricity passing through the body causing rapid injury. Approximately 1000 deaths per year due to electrical injuries are reported in the United States, with a mortality rate of 3-5%. Electrical burns differ from thermal or chemical burns in that they cause much more subdermal damage. They can exclusively cause surface damage, but more often tissues deeper underneath the skin have been severely damaged. As a result, electrical burns are difficult to accurately diagnose, and many people underestimate the severity of their burn. In extreme cases, electricity can cause shock to the brain, strain to the heart, and injury to other organs.
Lightning injuries are injuries caused by a lightning strike. Initial symptoms may include heart asystole and respiratory arrest. While the asystole may spontaneously resolve fairly rapidly, the respiratory arrest is typically more prolonged. Other symptoms may include burns and blunt injuries. Of those who survive, about 75% have ongoing health problems as a result, such as cataracts and hearing loss. If death occurs it is typically from either an abnormal heart rhythm or respiratory failure.