Showing posts with label Inventor. Show all posts
Showing posts with label Inventor. Show all posts

Sunday, January 19, 2020

Archimedes


Archimedes

(b. c. 290–280 BCE, Syracuse, Sicily [now in Italy]—d. 212/211 BCE,
Syracuse)

The most famous mathematician of ancient Greece,
Archimedes is especially important for his discovery of the relation between the surface and volume of a sphere and its circumscribing cylinder and for his formulation of a hydrostatic principle (known as Archimedes’ principle). As an inventor he is known for various ingenious (and perhaps mythical) optical and mechanical devices, including a device for raising water, still used in developing countries, known as the Archimedes screw.
Archimedes probably spent some time in Egypt early in his career, but he resided for most of his life in Syracuse, the principal Greek city-state in Sicily, where he was on intimate terms with its king, Hieron II. Archimedes published his works in the form of correspondence with the principal mathematicians of his time, including the Alexandrian scholars Conon of Samos and Eratosthenes of Cyrene. He played an important role in the defense of Syracuse against the siege laid by the Romans in 213 BCE by constructing war machines so effective that they long delayed the capture of the city. When Syracuse eventually fell to the Roman general Marcus Claudius Marcellus in the autumn of 212 or spring of 211 BCE, Archimedes was killed in the sack of the city.
Far more details survive about the life of Archimedes than about any other ancient scientist, but they are largely anecdotal, reflecting the impression that his mechanical genius made on the popular imagination. Thus, he is credited with inventing the Archimedes screw, and he is supposed to have made two “spheres” that Marcellus took back to Rome—one a star globe and the other a device (the details of which are uncertain) for mechanically representing the motions of the Sun, the Moon, and the planets. The story that he determined the proportion of gold and silver in a wreath made for Hieron by weighing it in water is probably true, but the version that has him leaping from the bath in which he supposedly got the idea and running naked through the streets shouting “Heurēka!” (“I have found it!”) is popular embellishment. Equally apocryphal are the stories that he used a huge array of mirrors to burn the Roman ships besieging Syracuse; that he said, “Give me a place to stand and I will move the Earth”; and that a Roman soldier killed him because he refused to leave his mathematical diagrams—although all are popular reflections of his real interest in catoptrics (the branch of optics dealing with the reflection of light from mirrors, plane or curved), mechanics, and pure mathematics.
According to Plutarch (c. 46–119 CE), Archimedes had so low an opinion of the kind of practical invention at which he excelled and to which he owed his contemporary fame that he left no written work on such subjects. While it is true that—apart from a dubious reference to a treatise, “On Sphere-Making”—all of his known works were of a theoretical character, his interest in mechanics nevertheless deeply influenced his mathematical thinking. Not only did he write works on theoretical mechanics and hydrostatics, but his treatise Method Concerning Mechanical Theorems shows that he used mechanical reasoning as a heuristic device for the discovery of new mathematical theorems.

Imhotep


Imhotep


(b. 27th century BCE, Memphis, Egypt)
Imhotep (Greek: Imouthes) was a vizier, sage, architect, astrologer, and chief minister to Djoser (reigned 2630– 2611 BCE), the second king of Egypt’s third dynasty, who was later worshipped as the god of medicine in Egypt and in Greece, where he was identified with the Greek god of medicine, Asclepius. He is considered to have been the architect of the step pyramid built at the necropolis of Saqq˙ ārah in the city of Memphis. The oldest extant monument of hewn stone known to the world, the pyramid consists of six steps and attains a height of 200 feet (61
metres).
Although no contemporary account has been found that refers to Imhotep as a practicing physician, ancient documents illustrating Egyptian society and medicine during the Old Kingdom (c. 2575– c. 2130 BCE) show that the chief magician of the pharaoh’s court also frequently served as the nation’s chief physician. Imhotep’s reputation as the reigning genius of the time, his position in the court, his training as a scribe, and his becoming known as a medical demigod only 100 years after his death are strong indications that he must have been a physician of considerable skill.
Not until the Persian conquest of Egypt in 525 BCE was Imhotep elevated to the position of a full deity, replacing Nefertem in the great triad of Memphis, shared with his mythological parents Ptah, the creator of the universe, and Sekhmet, the goddess of war and pestilence. Imhotep’s cult reached its zenith during Greco-Roman times, when his temples in Memphis and on the island of Philae (Arabic: Jazīrat Fīlah) in the Nile River were often crowded with sufferers who prayed and slept there with the conviction that the god would reveal remedies to them in their dreams. The only Egyptian mortal besides the 18th- dynasty sage and minister Amenhotep to attain the honour of total deification, Imhotep is still held in esteem by physicians who, like the eminent 19th-century British practitioner Sir William Osler, consider him “the first figure of a physician to stand out clearly from the mists of antiquity.”

Cro-Magnon


Cro-Magnon

Cro-Magnon was a population of early Homo sapiens dating from the Upper Paleolithic Period (c. 40,000 to c. 10,000 years ago) in Europe. In their ancient cave habitations they left behind traces of ingenious stone tools, carved statuettes and figurines, and painted scenes of striking beauty that are considered to be among the greatest treasures of human creativity.
In 1868, in a shallow cave at Cro-Magnon near the town of Les Eyzies-de-Tayac in the Dordogne region of southwestern France, a number of obviously ancient human skeletons were found. The cave was investigated by the French geologist Édouard Lartet, who uncovered five archaeological layers. The human bones found in the topmost layer proved to be between 10,000 and 35,000 years old. The prehistoric humans revealed by this find were called Cro-Magnon and have since been considered, along with Neanderthals (H. neanderthalensis), to be representative of prehistoric humans.

Cro-Magnons were robustly built and powerful and are presumed to have been about 5 feet 5 inches to 5 feet 7 inches (about 166 to 171 cm) tall. The body was generally heavy and solid, apparently with strong musculature. The forehead was straight, with slight browridges, and the face short and wide. Cro-Magnons were the first humans (genus Homo) to have a prominent chin. The brain capacity was about 100 cubic inches (1,600 cc), somewhat larger than the average for modern humans. It is thought that Cro-Magnons were probably fairly tall compared with other early human species.
It is still hard to say precisely where Cro-Magnons belong in recent human evolution, but they had a culture that produced a variety of sophisticated tools such as retouched blades, end scrapers, “nosed” scrapers, the chisel-like tool known as a burin, and fi ne bone tools. They also seem to have made tools for smoothing and scraping leather. Some Cro-Magnons have been associated with the  Gravettian industry , or Upper Perigordian industry, which is characterized by an abrupt retouching technique that produces tools with fl at backs. Cro-Magnon dwellings are most often found in deep caves and in shallow caves formed by rock overhangs, although primitive huts, either lean-tos against rock walls or those built completely from stones, have been found. The rock shelters were used year-round; the Cro-Magnons seem to have been a settled people, moving only when necessary to fi nd new hunting or because of environmental changes.

Like the Neanderthals, the Cro-Magnon people buried their dead. The first examples of art by prehistoric peoples are Cro-Magnon. The Cro-Magnons carved and sculpted small engravings, reliefs, and statuettes not only of humans but also of animals. Their human figures generally depict large-breasted, wide-hipped, and often obviously pregnant women, from which it is assumed that these figures had significance in fertility rites. Numerous depictions of animals are found in Cro-Magnon cave paintings throughout France and Spain at sites such as Lascaux, Les Eyzies-deTayac, and Altamira, and some of them are surpassingly beautiful. It is thought that these paintings had some magic or ritual importance to the people. From the high quality of their art, it is clear that Cro-Magnons were not primitive amateurs but had previously experimented with artistic mediums and forms. Decorated tools and weapons show that they appreciated art for aesthetic purposes as well as for religious reasons.
It is difficult to determine how long the Cro-Magnons lasted and what happened to them. Presumably they were gradually absorbed into the European populations that came later. Individuals with some Cro-Magnon characteristics, commonly called Cro-Magnoids, have been found in the Mesolithic Period (8000 to 5000 BCE) and the Neolithic Period (5000 to 2000 BCE).

Friday, January 17, 2020

Inventor

INVENTOR 

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Just a few hundred years ago, life was far different than it is today. When people wanted to travel or communicate, they had to go on foot or horseback. A journey of just a few miles by this method could be a long, arduous process. Whatever people owned—from clothing to tools—had to be made by hand. Work was manual, laborious, and often tedious. Illness was a constant threat; diseases rapidly spread through unsanitary conditions and were difficult to treat with the rudimentary medicines available.
Today, life in the United States and other developed countries is about ease and convenience. Communication is global and instantaneous. Transportation can carry people across states, countries, and even entire continents in a matter of hours. Industry has been automated, providing people with plenty of time outside of work to enjoy leisure pursuits. Modern medical treatments have enabled people to stay healthy well into their eighth, ninth, or even tenth decade.
Life has been transformed over the years through the efforts of the men and women who had the brilliance, diligence, and creativity to come up with new and better ways of doing things. As detailed throughout these pages, their inventions spawned many more inventions, speeding up the pace of progress even further. Alexander Graham Bell’s fascination with the idea of sending sound down a wire from the speaker to the listener gave birth to the telephone, which ultimately led to the cell phone, fax machine, modem, and a communication system that now links the entire globe.
These inventions, like many others, have clearly improved life by keeping people healthier, helping them to communicate and work more efficiently, and allowing them to travel farther. X-rays allowed doctors to look inside the human body to treat disease and injury. The electric light illuminated the darkness so people could work (and play) at night. Braille made it possible for blind people to read.
However, some inventions, while having their obvious benefits, have also had their pitfalls. Before Eli Whitney invented the cotton gin in 1793, separating cotton lint from its seeds was a 10-hour, labour-intensive ordeal. Whitney’s invention transformed cotton production into a rapid process that for the first time made cotton farming a highly profitable business. Yet the cotton gin also prolonged slavery, as cotton plantations needed a larger labour force to keep up with increased production demands.
Other inventions were controversial because of their potential for destruction. Edward Teller, father of the hydrogen bomb, was described by one scientist as being one of the “most thoughtful statesmen of science.” However, another contemporary referred to Teller as “a danger to all that’s important,” and claimed that the world would have been better off without him. In 1948, Paul Hermann Müller received a Nobel Prize for discovering the toxic effects on insects of the chemical compound known as DDT, a pesticide that efficiently wiped out the insects that carry deadly diseases such as malaria, yellow fever, and typhus. DDT was initially hailed as a “miracle” pesticide. Yet by the early 1970s it had been banned from public use in the United States. Health officials had discovered that while DDT was killing insects, it was also accumulating in other wildlife, notably falcons and eagles, and dangerously lowering their reproduction rate.
Even the most groundbreaking and world-changing inventions were not always recognized as such when they were introduced to the public. When Rutherford B. Hayes saw a demonstration of Alexander Graham Bell’s telephone in 1876, the president’s response was less than enthusiastic. “That’s an amazing invention, but who would ever want to use one of them?” he scoffed. In 1968, the audience attending a computer conference at the San Francisco Civic Auditorium likely didn’t know what to make of Douglas Engelbart’s invention—a small wooden box with a button that moved a cursor on an attached machine. His “mouse,” so named for its tail-like cable, now enables virtually every home and business computer user to navigate around their computer screens.
Inventors themselves have sometimes been skeptical about the ability of their own creations to endure. Despite the public excitement that greeted their Cinèmatographe motion picture machine when it was released in 1895, the Lumière brothers felt that their invention was just a fad. In fact, Louis Lumière referred to the cinema as “an invention without a future.” In spite of the Lumière brothers’ initial cynicism, film endures as one of the most popular art forms today.
What InspIres InventIon?

The old saying, “Necessity is the mother of invention,” couldn’t be more true. Inventors have had a knack for recognizing a need or problem in society and then discovering a way to fill that need or solve that problem.
In the 15th century, as the number of universities in Europe grew and public literacy spread, a more efficient method was needed for reproducing books—a demand that was met by Johannes Gutenberg’s printing press.
Sometimes it was the inventor’s own necessity that gave birth to invention. Frustrated at having to change pairs of glasses whenever he switched from reading to viewing objects at a distance, Benjamin Franklin invented a new type of glasses—bifocals—that could easily accommodate both views.
Intelligence and curiosity are unquestionably important assets for inventors, but having an advanced degree—or even a formal education—has never been a prerequisite. Thomas Edison studied at home with his mother. Orville and Wilbur Wright never finished high school. George Washington Carver, who began life as a slave, taught himself to read from the only book he possessed—Webster’s Elementary Spelling Book.
What ultimately fueled the spark of discovery and led inventors to their “eureka” moment was unique to each person. Dr. Robert H. Goddard, who pioneered the first rocket-powered spacecraft, became fascinated with the idea of space flight after reading H.G. Wells’s science fiction novel The War of the Worlds. Decades before Henry Ford introduced the Model T automobile and designed the moving assembly line, he became fascinated with the inner workings of clocks and watches. When Steve Wozniak, inventor of the Apple II computer, was 11 years old, he built a computer so that he could play tic-tac-toe.
Often inventors were inspired by one another. Orville and Wilbur Wright became interested in aviation after reading about German aviation engineer Otto Lilienthal’s experiments with gliders. In turn, the Wright Brothers’ famous 1903 flight at Kitty Hawk, N.C., inspired a teenaged Russian boy named Igor Sikorsky to later invent the world’s first single-rotor helicopter.
Some inventions throughout history have occurred purely by accident. In 1796, in an effort to find an inexpensive way to print his own plays, Austrian actor and playwright Alois Senefelder stumbled across the promising potential of using fine-grained stone instead of copper plate, thereby inventing the process of lithography. In 1839, businessman Charles Goodyear was looking for a way to make natural rubber more pliable, when he accidentally spilled some rubber mixed with sulfur on a hot stove. He discovered that instead of melting, the rubber became more elastic. Thus was the vulcanization process born, and with it a whole range of uses for rubber.
For other inventions, however, the process was painstakingly slow and required many hours of trial and error. Thomas Edison experimented with 6,000 different materials before finally discovering a filament (carbonized thread) that would stay lit for many hours inside a bulb without burning up. It’s no wonder that the famous quote “Genius is 99 percent perspiration and 1 percent inspiration” is attributed to him.
Despite the hard work that was often required to produce an invention, money was not always the impetus for the inventors in this book. In fact, before the 18th century, inventors had no guarantee that their ideas would not be stolen. The design of Eli Whitney’s cotton gin was so basic that manufacturers throughout the South began to copy it, and Whitney was never able to profit from his own invention.
However, the introduction of the U.S. Patent system in 1790 meant that inventors could for the first time prevent others from copying their work. (Thomas Edison was issued some 1,093 U.S. patents during his prolific career.) With the protection that patents afforded often came huge profits. When Henry Ford died in 1947, his estimated net worth was around $600 million.
Money was just one of the benefits awarded to those who came up with a successful invention. Inventors also earned fame, recognition, and a place in history. Some received what is thought to be the highest honour—the Nobel Prize. (The man responsible for establishing this prize, Alfred Nobel, is himself included in the pages of this book for his invention of dynamite.) In 1909, Guglielmo Marconi received the Nobel Prize in Physics for developing the first practical radio. English biochemist Frederick Sanger was awarded the Nobel Prize in Chemistry twice: once in 1958 and again in 1980 (shared with Paul Berg and Walter Gilbert) for his pioneering work unraveling the mysteries of DNA. the Inventors

This book recognizes not only the inventors whose work changed the course of human life, but also those whose ideas paved the way for future generations of inventors. In the mid 1800s, mathematician Charles Babbage developed a model for an automatic computing engine, but he never built his device. A century later, Babbage’s idea that a machine could perform scientific computations reemerged, and today the computer is recognized as one of the most revolutionary inventions in history.
The vast majority of the inventors who have been included in these pages lived during the 19th and 20th centuries, which should come as no surprise considering that this was the time period in which the modern scientific age began. However, that is not to say that the many inventors who came before that period were any less important. Cro-Magnons’ stone tools were a technological feat. The Archimedes screw water pump, invented in the 3rd century BCE, is still in use today. Recorded history would not have been possible without Cai Lun’s invention of paper in 105 CE.
There was no lack of invention before the 19th century; it was just the pace of invention that sped up significantly after that time. When Charles Duell, head of the U.S. Patent Office, famously declared, “Everything that can be invented has been invented,” in 1899, how wrong he was. In 2008 alone, the U.S. Patent and Trademark Office granted more than 185,000 patents for new inventions.
Some of these inventions may never make headlines or revolutionize the world, but they will all have an effect (however subtle) on people’s lives.
The speed of invention today is so rapid that the world can literally change during the course of one individual’s lifetime. Someone who was born in the early part of the 20th century will have witnessed the invention of the television, computer, Internet, microwave oven, helicopter, penicillin, and dozens of other innovations that have transformed the way in which people live.
One of the fields where invention has made the greatest strides is in medical science. At the turn of the 20th century, doctors were able to look inside the human body without cutting it open (thanks to Wilhelm Röntgen’s X-rays). By the end of the century, they had unraveled the entire genetic code and discovered the minute changes that lead to disease. Looking ahead into the next century, new therapies might be developed that could reprogram human DNA, changing the course of an individual’s medical history before he or she is even born.
So many inventors have made important contributions that to mention them all here would far exceed the space limitations of this book. The 100 men and women who have been included are among the greatest and most prolific inventors of all time. They were selected because their inventions have altered the course of people’s lives and have left an indelible stamp on human history.

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