electrical study for b'tech,BE,diploma engineering (electical and electronics)
Friday, March 22, 2013
ANCIENT ELECTRICTY - TOP SEVEN CONTENDERS.
The proposal is simple. Some historians and independent researchers believe that ancient civilisations were much more technologically advanced than is commonly accepted. Specifically, they believe that some sectors of society had access to electricity and used it for both practical and religious purposes
Here are the top seven contenders for the existence of ancient electricity. The electric catfish and the cat fur and amber effect are well recorded and not in dispute. The Coso Artefact is almost certainly the misinterpretation of evidence. As for the rest ... well they're open to debate.
1. CAT FUR AND AMBER GENERATOR
There can be no doubt that ancient civilizations were aware of static electricity even if they may not have fully understood it. They also appreciated the godlike power of lightning and must have been curious to observe this effect replicated in miniature when the fur of a cat was rubbed against certain materials in a darkened room. The effects of static electricity were first recorded by a Greek philosopher, Thales of Miletus, who lived between 624 BC and 546 BC. He is said to have experimented with amber, which the Greeks referred to as Elektron, and cat fur to create an electrical discharge as well as magnetism. From this observation a simple machine consisting of two spinning disks, one covered with leopard fur and one coated with glass or amber could be connected to gold axles and foil strips which would produce an electrical charge capable of generating sparks several inches in length.
2. ELECTRIC EELS - SHOCK THERAPY
Although it looks like an eel, Electrophorus Electricus is actually a Knife Fish that is able to generate and deliver significant electric shocks of up to 600 volts. The ancient Egyptians referred to an electric catfish, Malapterurus Electricus, as the "Thunderer of the Nile" which indicates that they had already made the connection to storm-related atmospheric discharges - lightning. According to various sources the Greeks and Romans were familiar with these creatures and may well have bred them in captivity. Historic records show that they were certainly farming many other types of exotic fish both for food and for amusement. Scribonus Largus, a physician at the court of the Roman Emperor Claudius (c.47AD), is reported to have written that these 'torpedo fish' could be used to treat a wide variety of ailments. They were used to numb the feet of gout sufferers as well as those suffering from persistent headaches. If this is true then this is the first recorded use of shock therapy. As recently as 2009 doctors in Boston have been successfully experimenting with electric currents to block migraines.
3. THE BAGHDAD BATTERY
In 1938 the Director of the National Museum of Iraq, Wilhelm König, discovered a number of curious terracotta pots in the archives. Each one was approximately 13 cm in height with a capped 3.3 cm opening at the top. Each pot contained an open-ended copper cylinder and inside this was a small iron rod. These artefacts strongly resembled simple galvanic batteries and in 1940 König published a scientific paper proposing that these objects may well have been used to generate electrical current which could have been used for electroplating objects with either gold or silver. Mainstream archaeologists continue to doubt this theory even though reproductions using lemon juice as an electrolyte have been proven to work and no other sensible explanation exists for the iron and copper contents. The pots are likely to have been created during the Sassanid Period (224 AD - 640 AD). The debate continues.
4. THE LIGHTHOUSE OF PHAROS
Considered to be one of the seven wonders of the ancient world, construction of the 130m tall Pharos Lighthouse probably began around 280 BC on a small island just off the coast of Alexandria, Egypt. Originally commissioned by the Macedonian general, Ptolemy Soter who became ruler of Egypt after the death of Alexander the Great, it was completed during the reign of his son Ptolemy Philadelphos. Today the island of Pharos has become part of the mainland and shields a natural harbour. The building was erected to house a brilliant light to assist ships to find the port at night. Historic reports claim that the light could be seen nearly thirty miles out to sea and that it housed a beam so bright that could blind sailors and burn enemy ships. This has given rise to the theory that only an electrical arc lamp and a huge concave mirror could have created this effect. Proponents of this theory admit that the source of the power is a mystery but that an electric light is the only possible explanation for the extraordinary intensity of the lamp.
5. THE DENDERA LIGHTS
Within the Temple of Hathor, which is part of the Dendera (Tentyra) Temple Complex in Egypt, are a series of carvings that many people believe depict the sophisticated use of electricity to generate light. Items identified are as follows: an arc light lamp (horizontal) several upright lamps, lamp socket, arc light flicker (snake) electric cables, an isolator and even a large upright battery. If historians and archaeologists believed that the Egyptians from this period used electricity then this would probably be considered a classic example. A further point that is often overlooked is that Hathor was a goddess who is usually shown with a sun disk suspended between two horns exactly like the reflecting mirror of an arc lamp - even the dimensions are optimal. Although the equipment in the images may seem obvious it should also be noted that many historians, archaeologists and Egyptologists strongly deny that the images are anything more than the representation of a fertility rite based on Egyptian mythology. Proponents of the 'lights' theory are often dismissed as fringe scientists while mainstream Egyptologists are often accused of hiding behind conveniently concocted myths and retentive thinking. Both groups seem certain in their beliefs.
6. THE ABYDOS MACHINES
Roughly 450 kilometres south of Cairo is the ancient city-complex of Abydos. It is widely considered to be one of the most important archaeological sites in Egypt although for some quite differing reasons. Mainstream Egyptologists recognise it as the site of the Osiris and Isis cult while proponents of ancient electricity believe it holds definite proof that ancient civilisations were significantly more advanced than historians will acknowledge. The reason for this is that within the Hypostyle Hall of the Temple of Seti I there are a series of carvings that clearly depict modern aircraft, particularly a helicopter and dirigible. Mainstream archaeologists claim that they are merely a coincidence caused by over-carving while proponents of ancient technology state that this is actually misleading and that attempts to recreate the over-carving effect have been less than conclusive. In addition, they point out that the coincidence required to produce these images is staggeringly unlikely.
7. THE COSO ARTEFACT
The area around the town of Olancha in California, America, is popular destination for 'rock hunters' and attracts both professional and amateur geologists. On Monday the 13th February 1961 three geode collectors, Wallace Lane, Mike Mikesell and Virginia Maxey discovered an interesting specimen which Mike Mikesell took home and cut in half with a diamond edged saw. Inside the specimen he discovered what appeared to be an off-white ceramic cylinder with a small metal core running through the centre - in short, a sparkplug. According to Ms. Maxey the specimen was examined by a professional geologist who estimated that the casing was at least 500,000 years old. The identity of the geologist has never been revealed. The discovery caused significant controversy with some experts claiming that the rock was nothing more than a 'concretion' of rust and localised fossils. Perhaps because of the controversy the finders refused to further display or discuss the artefact after 1969. The location of the artefact is currently unknown as are the people who found it although it is believed that Lane passed away in 2008.
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