| Inventors of the Modern Computer | |||
The History of the Computer Mouse and the Prototype for Windows - Douglas Engelbart.
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The blog is mainly a general knowledge page for all age groups who are interested in improving their knowledge. I have tried to make the explanations as simple as I can. I have made use of tht for gathering the facts.
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HIPPOCRATES Father of Medicine in the Western World. As we saw from the postings on Sushruta and Charakan, medicne and surgery was quite ...
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HIPPOCRATES Father of Medicine in the Western World. As we saw from the postings on Sushruta and Charakan, medicne and surgery was quite ...
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DEAR ALL, SWAMI VIVEKANANDA JAYANTHI, JANUARY 12 2011 Swami Vivekananda was born in Calcutta (Now Kolkata) Monday in a traditional family...
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Sangam Age in Tamil Kingdoms The history of the Tamil country becomes clear only from the Sangam period. The word Sangam means an assoc...
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Ernest Rutherford Discovers the Structure of an Atom. 1911 Ernest Rutherford in academic garb. Courtesy Edgar Fahs Smith Mem...
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The Rani of Jhansi Regiment was the Women's Regiment of the Indian National Army, the armed force formed by Indian nationalists in 1942 ...
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Serendip...WHAT? T he Kingdom of Serendip Once upon a time there was an oriental and exotic Kingdom called Serendip, the memory of whic...
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Arikamedu Pondicherry This is a historic site which has revealed ancient Roman artifacts that are evidence of the thriving trade that exist...
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History of Medicine The historic contribution of Sushruta ,(600-500BC) circa the ancient surgeon of India, is well recognised for his i...
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FATHERS OF SURGERY AND MEDICINE 4200 BC -- CAPT AJIT VADAKAYIL FATHER OF SURGERY -- ACHARYA SUSHRUTA FATHER OF MEDICINE -- ACHARYA CHA...
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Brihdeshwar Temple has been declared as world heritage site in 1987 AD. The temple is located in the rice bowl district of Tamil Nadu, Than...
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Wednesday, August 3, 2011
Douglas Engelbart Invented the computer mouse (1964)
Tuesday, August 2, 2011
Wilson Greatbatch Invented the first heart pacemaker (1960)
1996 Lemelson-MIT Lifetime Achievement Award Winner.
| Photo by Robert Lewis |
In an attempt to record the sound of a heartbeat, Dr. Wilson Greatbatch inadvertently created something far more crucial—a device that emitted electricity pulses to the heart. It was this discovery that led to the implantable cardiac pacemaker and distinguished Greatbatch as having created one of the most significant inventions of the 20th century. In 1996, he was honored with the Lemelson-MIT Lifetime Achievement Award.
Greatbatch first learned of heart block—a condition in which a nerve fails to send electrical impulses to make the heart work—while talking with two surgeons visiting Cornell University in the early 1950s. At the time, combating heart block was done with a painful electric shock delivered via bulky external equipment. Greatbatch was convinced he could invent a smaller, implantable device.
Then, quite by accident, Greatbatch's "eureka moment" happened in 1958. Transistors had recently become available, and Greatbatch was building an oscillator with one transistor to record heartbeat sounds. He incorporated the wrong transistor, which produced a pulse that mimicked the rhythm of a heart. "I stared at the thing in disbelief, thinking this was exactly the properties of a pacemaker," said Greatbatch.
Greatbatch licensed his invention to Medtronic, Inc., and the first pacemaker was implanted in a human in 1960. He upgraded his device with a lithium iodine battery for durability in 1970, and his invention has been saving lives ever since.
Greatbatch has shown a commitment to educating children through inspirational speeches at schools and museums. He also established the Eleanor and Wilson Greatbatch Foundation to donate money to schools and other causes.
Still inventing, Greatbatch acquired three patents with scientist John Sanford in the 1980s and 1990s for methods of inhibiting the replication of AIDS and another similar virus in cats.
Greatbatch was born in 1919 in Buffalo, NY. U.S. Naval service in World War II enabled him to receive a bachelor's degree in engineering from Cornell University as a GI Bill student (1950). He received a master's in electrical engineering from the University of Buffalo (1957), succeeded by four honorary degrees. Greatbatch, who holds over 220 patents, is a member of the National Inventors Hall of Fame and the National Academy of Engineering, among others.
Monday, August 1, 2011
Jack Kilby Made the first microchip - the start of miniaturisation of technology (1958)
It seems that the integrated circuit was destined to be invented. Two separate inventors, unaware of each other's activities, invented almost identical integrated circuits or ICs at nearly the same time.
Jack Kilby, an engineer with a background in ceramic-based silk screen circuit boards and transistor-based hearing aids, started working for Texas Instruments in 1958. A year earlier, research engineer Robert Noyce had co-founded the Fairchild Semiconductor Corporation. From 1958 to 1959, both electrical engineers were working on an answer to the same dilemma: how to make more of less.
Why the Integrated Circuit Was Needed
In designing a complex electronic machine like a computer it was always necessary to increase the number of components involved in order to make technical advances. The monolithic (formed from a single crystal) integrated circuit placed the previously separated transistors, resistors, capacitors and all the connecting wiring onto a single crystal (or 'chip') made of semiconductor material. Kilby used germanium and Noyce used silicon for the semiconductor material.Patents for the Integrated Circuit
In 1959 both parties applied for patents. Jack Kilby and Texas Instruments received U.S. patent #3,138,743 for miniaturized electronic circuits. Robert Noyce and the Fairchild Semiconductor Corporation received U.S. patent #2,981,877 for a silicon based integrated circuit. The two companies wisely decided to cross license their technologies after several years of legal battles, creating a global market now worth about $1 trillion a year.Commercial Release
In 1961 the first commercially available integrated circuits came from the Fairchild Semiconductor Corporation. All computers then started to be made using chips instead of the individual transistors and their accompanying parts. Texas Instruments first used the chips in Air Force computers and the Minuteman Missile in 1962. They later used the chips to produce the first electronic portable calculators. The original IC had only one transistor, three resistors and one capacitor and was the size of an adult's pinkie finger. Today an IC smaller than a penny can hold 125 million transistors.
Jack Kilby holds patents on over sixty inventions and is also well known as the inventor of the portable calculator (1967). In 1970 he was awarded the National Medal of Science.Robert Noyce, with sixteen patents to his name, founded Intel, the company responsible for the invention of the microprocessor, in 1968. But for both men the invention of the integrated circuit stands historically as one of the most important innovations of mankind. Almost all modern products use chip technology.
Sunday, July 31, 2011
Jonas Salk Made the vaccine for polio (1955)..Humility Personified
| Jonas Salk - Medical Pioneer | ||||
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Saturday, July 30, 2011
Sir Christopher Cockerell Invented the hovercraft
Hovercraft
By Mary Bellis
A hovercraft is a vehicle supported on a cushion of air supplied by a powered fan mounted on the craft.
The hovercraft was invented by Christopher Cockerell in 1956. The theory behind one of the most successful inventions of the 20th century, the Hovercraft, was originally tested in 1955 using an empty KiteKat cat food tin inside a coffee tin, an industrial air blower and a pair of kitchen scales. Sir Christopher Cockerell developed the first practical hovercraft designs, these led to the first hovercraft to be produced commercially, the SRN1.
Christopher Cockerell's idea was to build a vehicle that would move over the water's surface, floating on a layer of air. This would reduce friction between the water and vehicle. To test his hypothesis, he put one a smaller can inside a larger can and used a hairdryer to blow air into them. The downward thrust produced was greater when one can was inside the other rather than air just being blown into one can.
By Mary Bellis
A hovercraft is a vehicle supported on a cushion of air supplied by a powered fan mounted on the craft.
Christopher Cockerell's idea was to build a vehicle that would move over the water's surface, floating on a layer of air. This would reduce friction between the water and vehicle. To test his hypothesis, he put one a smaller can inside a larger can and used a hairdryer to blow air into them. The downward thrust produced was greater when one can was inside the other rather than air just being blown into one can.
Friday, July 29, 2011
Djerassi...Discovered the contaceptive pill.
Djerassi was born in the Austrian capital of Vienna, the son of a Bulgarian physician and an Austrian mother. As both parents were Jewish, Djerassi emigrated to America in 1939. He was educated at Kenyon College, Ohio, and at the University of Wisconsin, where he completed his PhD in 1945, the same year in which he became an American citizen. From 1945 to 1949 he worked for the pharmaceutical company CIBA in Summit, New Jersey, as a research chemist. In 1949 Djerassi decided to join a new pharmaceutical company, Syntex, in Mexico City, to work on the extraction of cortisone from plants. At that time it was being produced from cattle bile at a cost of 200 dollars a gram.
Despite competition from other leading laboratories, Syntex were the first to extract cortisone (C21H28O5) from a vegetable source, namely diosgenin (C27H42O3), a steroid derived from a variety of wild Mexican yam.
Following their initial success Djerassi and his team turned their attention to the steroid hormone progesterone. Known as ‘nature's contraceptive’, the hormone inhibits ovulation. Why, then, could it not be taken as a simple, natural contraceptive? The difficulty was that taken orally it lost most of its activity. Further, as hormones were extracted from such animal sources as human urine, bull's testicles, and sow's ovaries where they occur in small amounts, they tended to be very expensive. The first step was to produce progesterone synthetically. This was achieved at Syntex by Djerassi and others in the early 1950s, the price of progesterone dropped dramatically and it became available in large quantities.
Progesterone (C21H30O2) contains four rings of carbon atoms. Following some hints in the literature Djerassi thought that the removal of the methyl group at position 19, thus forming 19-norprogesterone, would increase its potency. His hunch proved to be sound. He was also aware that an acetylene bond introduced into position 17 of the male hormone testosterone increased its oral activity, although known as ‘ethisterone’, it had found no use.
Djerassi's crucial step was to propose that ethisterone's potency could be enhanced, as with progesterone, by removing a methyl group. By October 1951 he had produced testosterone minus a methyl group, but with an added acetylene group. The precise result was 19-nor-17a-ethinyltestosterone, which proved to be a highly active oral progestational hormone. A patent was filed in November 1951. After the appropriate testing it received Federal approval in 1962 under the name Ortho-Novum. Djerassi received one dollar for the patent, a standard payment by a pharmaceutical company to its staff.
Thursday, July 28, 2011
George deMestral/ Invented velcro (1948)
The Invention of VELCRO ® - George de Mestral

Microscopic view of VELCRO
By Mary Bellis
One lovely summer day in 1948, a Swiss amateur-mountaineer and inventor decided to take his dog for a nature hike. The man and his faithful companion both returned home covered with burrs, the plant seed-sacs that cling to animal fur in order to travel to fertile new planting grounds. The man neglected his matted dog, and with a burning curiosity ran to his microscope and inspected one of the many burrs stuck to his pants. He saw all the small hooks that enabled the seed-bearing burr to cling so viciously to the tiny loops in the fabric of his pants. George de Mestral raised his head from the microscope and smiled thinking, "I will design a unique, two-sided fastener, one side with stiff hooks like the burrs and the other side with soft loops like the fabric of my pants. I will call my invention 'velcro' a combination of the word velour and crochet. It will rival thezipper in its ability to fasten."
Mestral's idea met with resistance and even laughter, but the inventor 'stuck' by his invention. Together with a weaver from a textile plant in France, Mestal perfected his hook and loop fastener. By trial and error, he realized that nylon when sewn under infrared light, formed tough hooks for the burr side of the fastener. This finished the design, patented in 1955. The inventor formed Velcro Industries to manufacture his invention. Mestral was selling over sixty million yards of Velcro per year. Today it is a multi-million dollar industry.
Not bad for an invention based on Mother Nature.
Wednesday, July 27, 2011
Enrico Fermi Built the first nuclear reactor at the University of Chicago (1942)
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Tuesday, July 26, 2011
Igor Sikorsky Inventor of the modern helicopter (1939)
Igor Sikorsky.
Vought-Sikorsky VS-300 Early Helicopter
The first, tentative and tethered hover of the 1940 prototypeSikorsky VS-300 which, in May 1940, progressed to free flight. Igor Sikorsky himself, though aged fifty-nine at the time and casually attired, did all the early test flying. The skeletal VS-300 went through many forms and was not as advanced as some of the best contemporary German machines but it possessed two very large advantages: it was American and it introduced a most elegant solution to the problem of overcoming rotor torque with the now classic tail rotor.
Igor Sikorsky, who emigrated to the United States in 1919, was in the 1930s engaged in the design of the only possible form of long-distance airliners then feasihie, the Clipper flying boats. The company for whom he worked was United Aircraft Corporation (UAC). In about 1931 an early interest in helicopters returned and Sikorsky began to experiment in that little-known field. By 1938, possibly as a result of news of the flights of the Focke-Achgelis Fw 61, the UAC board appointed him to the post of engineering manager of the Vought-Sikorsky Division with a remit to develop a practical helicopter. The result, after a great deal of hard, mainly empirical, development work, was the open-framed VS-300, which first flew in free flight in May 1940 with Sikorsky himself at the controls, famously clad in an overcoat and trilby hat. The VS-300 lacked the elegant engineering of the German Flettner or Focke-Achgelis designs but it flew - just.
It is often pointed out that Sikorsky invented nothing new with the VS-300; this may be true, but he assembled the best-known techniques to produce his first practical helicopter. The main difference between the VS-300 and the German machines was Sikorsky's use of a single, three-bladed rotor with a collective pitch head and the small anti-torque propeller set at 90 degrees at the rear of the fuselage, a configuration that was to become universal. In May 1941, after no fewer than seventeen major modifications, the VS-300 was demonstrated to the US Army and Navy. An army captain, Franklin Gregory, an experienced autogyro pilot, flew theVS- 300. He found it very hard to control, describing the machine as a 'bucking bronco and difficult but possible to master, given new piloting techniques and intensive development of the helicopter's control systems.
Monday, July 25, 2011
Laszlo Jose Biro Invented the ball point pen (1938)..by Mary Bellis
| A Brief History of Writing Instruments | ||||||
"No man was more foolish when he had not a pen in his hand, or more wise when he had" - Samuel Johnson. A Hungarian journalist named Laszlo Biro invented the first ballpoint pen in 1938. Biro had noticed that the type of ink used in newspaper printing dried quickly, leaving the paper dry and smudge-free. He decided to create a pen using the same type of ink. The thicker ink would not flow from a regular pen nib and Biro had to devise a new type of point. He did so by fitting his pen with a tiny ball bearing in its tip. As the pen moved along the paper, the ball rotated picking up ink from the ink cartridge and leaving it on the paper. This principle of the ballpoint pen actually dates back to an 1888 patent owned by John J. Loud for a product to mark leather. However, this patent was commercially unexploited. Laszlo Biro first patented his pen in 1938, and applied for a fresh patent in Argentina on June 10, 1943. (Laszlo Biro and his brother Georg Biro emigrated to Argentina in 1940.) The British Government bought the licensing rights to this patent for the war effort. The British Royal Air Force needed a new type of pen, one that would not leak at higher altitudes in fighter planes as the fountain pen did. Their successful performance for the Air Force brought the Biro pens into the limelight. Laszlo Biro had neglected to get a U.S. patent for his pen and so even with the ending of World War II, another battle was just beginning.. Historical Outline - The Battle of Ballpoint Pens The first pen-writing instrument was the quill pen dipped into dark paint. There became a need to lengthen the time between dips, eliminate splatter, eliminate smearing and improve pen handling.
Ballpoint pens guaranteed to write for two years without refilling, claimed to be smear proof. Reynolds advertised it as the pen "to write under water." Eversharp sued Reynolds for copying the design it had acquired legally. The previous 1888 patent by John Loud would have invalidated everyone's claims. However, no one knew that at the time. Sales skyrocketed for both competitors. Nevertheless, the Reynolds’ pen leaked, skipped and often failed to write. Eversharp’s pen did not live up to its own advertisements. A very high volume of pen returns occurred for both Eversharp and Reynolds. The ballpoint pen fad ended - due to consumer unhappiness.
The Ballpoint Pen Battle is Won
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