Saturday 21 June 2014

He stepped ahead from FASTENING to ZIPPING !!!


Gideon Sundback (April 24, 1880 – June 21, 1954) was a Swedish-American electrical engineer, who is most commonly associated with his work in the development of the zipper. Otto Fredrik Gideon Sundback was born on Sonarp farm in Ödestugu Parish, in Jönköping CountySmålandSweden. He was the son of Jonas Otto Magnusson Sundbäck, a prosperous farmer, and his wife Kristina Karolina Klasdotter. After his studies in Sweden, Sundback moved to Germany, where he studied at the polytechnic school in Bingen am Rhein. In 1903, Sundback took his engineer exam. In 1905, he emigrated to the United States.

In 1905, Gideon Sundback started to work at Westinghouse Electric and Manufacturing Company in Pittsburgh, Pennsylvania. In 1906, Sundback was hired to work for the Universal Fastener Company of Hoboken, New Jersey. Subsequently in 1909, Sundback was promoted to the position of head designer at Universal Fastener.
Sundback made several advances in the development of the zipper between 1906 and 1914, while working for companies that later evolved into Talon, Inc. He built upon the previous work of other engineers such as Elias Howe, Max Wolff, and Whitcomb L. Judson.
He was responsible for improving the "Judson C-curity Fastener". At that time the company's product was still based on hooks and eyes. Sundback developed an improved version of the C-curity, called the "Plako", but it too had a strong tendency to pull apart, and was not any more successful than the previous versions. Sundback finally solved the pulling-apart problem in 1913, with his invention of the first version not based on the hook-and-eye principle, the "Hookless Fastener No. 1". He increased the number of fastening elements from four per inch to ten or eleven. 

His invention had two facing rows of teeth that pulled into a single piece by the slider, and increased the opening for the teeth guided by the slider. In 1914, Sundback developed a version based on interlocking teeth, the "Hookless No. 2", which was the modern metal zipper in all its essentials. In this fastener each tooth is punched to have a dimple on its bottom and a nib or conical projection on its top. The nib atop one tooth engages in the matching dimple in the bottom of the tooth that follows it on the other side as the two strips of teeth are brought together through the two Y channels of the slider. The teeth are crimped tightly to a strong fabric cord that is the selvage edge of the cloth tape that attaches the zipper to the garment, with the teeth on one side offset by half a tooth's height from those on the other side's tape. They are held so tightly to the cord and tape that once meshed there is not enough play to let them pull apart. A tooth cannot rise up off the nib below it enough to break free, and its nib on top cannot drop out of the dimple in the tooth above it. U.S. Patent 1,219,881 for the "Separable Fastener" was issued in 1917.

The name zipper was created in 1923 by B.F. Goodrich, who used the device on their new boots. Initially, boots and tobacco pouches were the primary use for zippers; it took another twenty years before they caught on in the fashion industry. About the time of World War II the zipper achieved wide acceptance for the flies of trousers and the plackets of skirts and dresses.

Sundback also created the manufacturing machine for the new zipper. Lightning Fastener Company, one early manufacturer of the zipper, was based in St. CatharinesOntario. Although Sundback frequently visited the Canadian factory as president of the company, he resided in MeadvillePennsylvania and remained an American citizen. Sundback was awarded the Gold Medal of the Royal Swedish Academy of Engineering Sciences in 1951. Sundback died of a heart condition in 1954 and was interred at Greendale Cemetery in Meadville, Pennsylvania.
The patent for the "Separable Fastener" was issued in 1917. Gideon Sundback also created the manufacturing machine for the new device. The "S-L" or "scrapless" machine took a special Y-shaped wire and cut scoops from it, then punched the scoop dimple and nib, and clamped each scoop on a cloth tape to produce a continuous zipper chain. Within the first year of operation, Sundback's machinery was producing a few hundred feet (around 100 meters) of fastener per day.
zipperzipfly or zip fastener, formerly known as a clasp locker, is a commonly used device for binding the edges of an opening of fabric or other flexible material, as on a garment or a bag. It is used in clothing (e.g., jackets and jeans), luggage and other bags, sporting goodscamping gear (e.g. tents and sleeping bags), and other items. Whitcomb L. Judson was an American inventor from Chicago who was the first to invent, conceive of the idea, and to construct a workable zipper. The method, still in use today, is based on interlocking teeth. Initially it was called the “hookless fastener” and was later redesigned to become more reliable.

Friday 20 June 2014

This Amazing Painter invented a code because of late news of wife's demise; which was used throughout the globe as TELEGRAPH !!!

Samuel Finley Breese Morse (April 27, 1791 – April 2, 1872) was an American painter who turned inventor.After having established his reputation as a portrait painter, in his middle age Morse contributed to the invention of a single-wire telegraph system based on European telegraphs. He was a co-developer of the Morse code, and helped to develop the commercial use of telegraphy. Born in Charlestown, Massachusetts, the first child of the pastor Jedidiah Morse, who was also a geographer, and his wife Elizabeth Ann Finley Breese.


After attending Phillips Academy in Andover, Massachusetts, Samuel Morse went on to Yale College to receive instruction in the subjects of religious philosophymathematics and science of horsesWhile at Yale, he attended lectures on electricity from Benjamin Silliman and Jeremiah Day. He supported himself by painting. In 1810, he graduated from Yale with Phi Beta Kappa honors.

Although Samuel Morse respected his father's religious opinions, he sympathized with the Unitarians.Among the converts to Unitarianism were the prominent Pickerings of Portsmouth, New Hampshire, whom Morse had painted. Some critics thought his sympathies represented his own anti-Federalism. Morse was commissioned to paint President James Monroe in 1820. He embodied Jeffersonian democracy by favoring the common man over the aristocrat.


In 1826 he helped found the National Academy of Design in New York City. He served as the Academy's President from 1826 to 1845 and again from 1861 to 1862.

On a subsequent visit to Paris in 1839, Morse met Louis DaguerreHe became interested in the latter's daguerreotype—the first practical means of photography. Morse wrote a letter to the New York Observer describing the invention, which was published widely in the American press and provided a broad awareness of the new technology.

As noted, in 1825 New York City had commissioned Morse to paint a portrait of Lafayette, then visiting Washington, DC. While Morse was painting, a horse messenger delivered a letter from his father that read, "Your dear wife is convalescent". The next day he received a letter from his father detailing his wife's sudden death. Morse immediately left Washington for his home at New Haven, leaving the portrait of Lafayette unfinished. By the time he arrived, his wife had already been buried. Heartbroken that for days he was unaware of his wife's failing health and her death,he decided to explore a means of rapid long distance communication.

While returning by ship from Europe in 1832, Morse encountered Charles Thomas Jackson of Boston, a man who was well schooled in electromagnetismWitnessing various experiments with Jackson's electromagnet, Morse developed the concept of a single-wire telegraph. The original Morse telegraph, submitted with his patent application, is part of the collections of the National Museum of American History at the Smithsonian Institution. In time the Morse code, which he developed, would become the primary language of telegraphy in the world. It is still the standard for rhythmic transmission of data.

Morse received a patent for the telegraph in 1847, at the old Beylerbeyi Palace (the present Beylerbeyi Palace was built in 1861–1865 on the same location) in Istanbul, which was issued by Sultan Abdülmecid, who personally tested the new invention. He was elected an Associate Fellow of the American Academy of Arts and Sciences in 1849. The original patent went to the Breese side of the family after the death of Samuel Morse.

Morse lent his support to Cyrus West Field’s ambitious plan to construct the first transoceanic telegraph line. Morse had experimented with underwater telegraph circuits since 1842. He invested $10,000 in Field’s Atlantic Telegraph Company, took a seat on its board of directors, and was appointed honorary "Electrician". In 1856, Morse traveled to London to help Charles Tilston Bright and Edward Whitehouse test a 2,000-mile-length of spooled cable. After the first two cable-laying attempts failed, Field reorganized the project, removing Morse from direct involvement. Though the cable broke three times during the third attempt, it was successfully repaired, and the first transatlantic telegraph messages were sent in 1858.


In addition to the telegraph, Morse invented a marble-cutting machine that could carve three-dimensional sculptures in marble or stone. He could not patent it, however, because of an existing 1820 Thomas Blanchard design.


Patents to his name:

Morse code is a method of transmitting text information as a series of on-off tones, lights, or clicks that can be directly understood by a skilled listener or observer without special equipment. The International Morse Code encodes the ISO basic Latin alphabet, some extra Latin letters, the Arabic numerals and a small set of punctuation and procedural signals as standardized sequences of short and long signals called "dots" and "dashes", or "dits" and "dahs". Because many non-English natural languages use more than the 26 Roman letters, extensions to the Morse alphabet exist for those languages.


Thursday 19 June 2014

From Maths to Philosophy....this child prodigy did it all in a short life span and left a strong impression on MATHEMATICS!!!


Blaise Pascal (19 June 1623 – 19 August 1662) was a French mathematician, physicist, inventor, writer and Christian philosopherHe was a child prodigy who was educated by his father, a tax collector in Rouen. Pascal's earliest work was in the natural and applied sciences where he made important contributions to the study of fluids, and clarified the concepts of pressure and vacuum by generalizing the work of Evangelista Torricelli. Pascal also wrote in defense of the scientific method.


In 1642, while still a teenager, he started some pioneering work on calculating machines. After three years of effort and fifty prototypes, he was one of the first two inventors of the mechanical calculator. He built 20 of these machines (called Pascal's calculators and later Pascalines) in the following ten years. Pascal was an important mathematician, helping create two major new areas of research: he wrote a significant treatise on the subject of projective geometry at the age of 16, and later corresponded with Pierre de Fermat on probability theory, strongly influencing the development of modern economics and social science

Following Galileo and Torricelli, in 1646 he refuted Aristotle's followers who insisted that nature abhors a vacuum. Pascal's results caused many disputes before being accepted. In 1646, he and his sister Jacqueline identified with the religious movement within Catholicism known by its detractors as Jansenism. His father died in 1651. Following a religious experience in late 1654, he began writing influential works on philosophy and theology. His two most famous works date from this period: the Lettres provinciales and the Pensées, the former set in the conflict between Jansenists and Jesuits


In that year, he also wrote an important treatise on the arithmetical triangle. Between 1658 and 1659 he wrote on the cycloid and its use in calculating the volume of solids. Pascal had poor health, especially after his 18th year, and his death came just two months after his 39th birthday.


Born in Clermont-Ferrand; he lost his mother, Antoinette Begon, at the age of three. His father, Étienne Pascal, who also had an interest in science and mathematics, was a local judge and member of the "Noblesse de Robe". Pascal had two sisters, the younger Jacqueline and the elder Gilberte. Étienne, who never remarried, decided that he alone would educate his children, for they all showed extraordinary intellectual ability, particularly his son Blaise. The young Pascal showed an amazing aptitude for mathematics and science.


Particularly of interest to Pascal was a work of Desargues on conic sections. Following Desargues' thinking, the 16-year-old Pascal produced, as a means of proof, a short treatise on what was called the "Mystic Hexagram", Essai pour les coniques ("Essay on Conics") and sent it—his first serious work of mathematics—to Père Mersenne in Paris; it is known still today as Pascal's theorem. It states that if a hexagon is inscribed in a circle (or conic) then the three intersection points of opposite sides lie on a line (called the Pascal line).


Pascal's work was so precocious that Descartes was convinced that Pascal's father had written it. When assured by Mersenne that it was, indeed, the product of the son not the father, Descartes dismissed it with a sniff: "I do not find it strange that he has offered demonstrations about conics more appropriate than those of the ancients," adding, "but other matters related to this subject can be proposed that would scarcely occur to a 16-year-old child."


In 1642, in an effort to ease his father's endless, exhausting calculations, and recalculations, of taxes owed and paid (into which work the young Pascal had been recruited), Pascal, not yet 19, constructed a mechanical calculator capable of addition and subtraction, called Pascal's calculator or the Pascaline. Of the eight Pascalines known to have survived, four are held by the Musée des Arts et Métiers in Paris and one more by the Zwinger museum in Dresden, Germany, exhibit two of his original mechanical calculators.


Though these machines are pioneering forerunners to a further 400 years of development of mechanical methods of calculation, and in a sense to the later field of computer engineering, the calculator failed to be a great commercial success. Partly because it was still quite cumbersome to use in practice, but probably primarily because it was extraordinarily expensive the Pascaline became little more than a toy, and status symbol, for the very rich both in France and elsewhere in Europe. Pascal continued to make improvements to his design through the next decade and he refers to some 50 machines that were built to his design.

Pascal continued to influence mathematics throughout his life. His Traité du triangle arithmétique ("Treatise on the Arithmetical Triangle") of 1653 described a convenient tabular presentation for binomial coefficients, now called Pascal's triangle. Pascal's major contribution to the philosophy of mathematics came with his De l'Esprit géométrique ("Of the Geometrical Spirit"), originally written as a preface to a geometry textbook for one of the famous "Petites-Ecoles de Port-Royal" ("Little Schools of Port-Royal")

The work was unpublished until over a century after his death. Pascal also used De l'Esprit géométrique to develop a theory of definition. He distinguished between definitions which are conventional labels defined by the writer and definitions which are within the language and understood by everyone because they naturally designate their referent. The second type would be characteristic of the philosophy of essentialism


Pascal's work in the fields of the study of hydrodynamics and hydrostatics centered on the principles of hydraulic fluids. His inventions include the hydraulic press (using hydraulic pressure to multiply force) and the syringe. He proved that hydrostatic pressure depends not on the weight of the fluid but on the elevation difference.  In 1647, Pascal produced Experiences nouvelles touchant le vide ("New Experiments with the Vacuum"), which detailed basic rules describing to what degree various liquids could be supported by air pressure. It also provided reasons why it was indeed a vacuum above the column of liquid in a barometer tube.

Wednesday 18 June 2014

The first one to have led to both the tips of the earth successfully!!

Roald Engelbregt Gravning Amundsen (16 July 1872 – c. 18 June 1928) was a Norwegian explorer of polar regions. He led the Antarctic expedition (1910–12) to become the first men to reach the South Pole in December 1911. In 1926, he was the first expedition leader to be recognized without dispute as having reached the North Pole. He is also known as the first to traverse the Northwest Passage (1903–06). He disappeared in June 1928 while taking part in a rescue mission. Amundsen,Douglas Mawson, Robert Falcon Scott, and Ernest Shackleton were key expedition leaders during the Heroic Age of Antarctic Exploration.

Amundsen was born to a family of Norwegian shipowners and captains in Borge, between the towns Fredrikstad and Sarpsborg. His parents were Jens Amundsen and Hanna Sahlqvist. His mother wanted him to avoid the family maritime trade and encouraged him to become a doctor, a promise that Amundsen kept until his mother died when he was aged 21. He promptly quit university for a life at sea. Amundsen had hidden a lifelong desire inspired by Fridtjof Nansen's crossing of Greenland in 1888 and Franklin's lost expedition. He decided on a life of intense exploration of wilderness places.

Amundsen joined the Belgian Antarctic Expedition (1897–99) as first mate. This expedition, led by Adrien de Gerlache using the ship the Belgica, became the first expedition to winter in Antarctica. The Belgica, whether by mistake or design, became locked in the sea ice at 70°30′S off Alexander Island, west of the Antarctic Peninsula. In 1903, Amundsen led the first expedition to successfully traverse Canada's Northwest Passage between the Atlantic and Pacific oceans. 

South Pole Achievement
On 14 December 1911, he, along with the team of four, with 16 dogs, arrived at the Pole (90° 0′ S). They arrived 33–34 days before Scott’s group. Amundsen named their South Pole camp Polheim, "Home on the Pole." Amundsen renamed the Antarctic Plateau as King Haakon VII’s Plateau. They left a small tent and letter stating their accomplishment, in case they did not return safely to Framheim.

North Pole Achievement 
In 1925, accompanied by Lincoln Ellsworth, pilot Hjalmar Riiser-Larsen, and three other team members, Amundsen took two Dornier Do J flying boats, the N-24 and N-25, to 87° 44′ north. It was the northernmost latitude reached by plane up to that time. The aircraft landed a few miles apart without radio contact, yet the crews managed to reunite. Amundsen and his crew worked for over three weeks to clean up an airstrip to take off from ice. They shovelled 600 tons of ice while consuming only one pound (400 g) of daily food rations. In the end, six crew members were packed into the N-25. In a remarkable feat, Riiser-Larsen took off, and they barely became airborne over the cracking ice. They returned triumphant when everyone thought they had been lost forever.

Monday 16 June 2014

Made a device pointing to the TRUE NORTH; developed process of recovering tin from scrap!!!

Elmer Ambrose Sperry, Sr. (October 12, 1860 – June 16, 1930) was an American inventor and entrepreneur, most famous as co-inventor, with Herman Anschütz-Kaempfe of the gyrocompass. His compasses and stabilizers were adopted by the United States Navy and used in both world wars. He also worked closely with Japanese companies and the Japanese government and was honored after his death with a biography in his honor.

Sperry was born at Cincinnatus, New York on October 12, 1860 to Stephen Decatur Sperry and Mary Burst. He was a descendant of Richard Sperry. His mother died the next day, from complications from his birth. He spent three years at the state normal school in Cortland, New York, then a year at Cornell University in 1878 and 1879, where he became interested indynamos. He moved to Chicago, Illinois, early in 1880 and soon after founded the Sperry Electric Company.

In 1900 Sperry established an electrochemical laboratory at Washington, D.C., where he and his associate, Clifton P. Townshend, developed a process for making pure caustic soda and discovered a process for recovering tin from scrap metal. Sperry experimented with diesel engines and gyroscopic compasses and gyroscopic stabilizers for ships and aircraft.


In 1910 he founded the Sperry Gyroscope Company in Brooklyn, New York; his first compass was tested that same year in USS Delaware (BB-28). In 1914 he won a prize from the Aero Club of France for his airplane stabilizer. He also was awarded a Franklin Institute Medal in the same year. In 1918 he produced a high-intensity arc lamp which was used as a searchlight by both the Army and Navy after setting up eight companies and taking out over 400 patents.


In 1925, his son, Lawrence Burst Sperry (1892-1925), died in the North Sea in the crash of an airplane of his own design. In January 1929 he sold his Sperry Gyroscope Company to North American Aviation. The following year his wife died on March 31, in Havana, Cuba. He died at St. John's Hospital in Brooklyn, New York on June 16, 1930 from complications following the removal of gallstones six weeks earlier. He was 69 years old.

A gyrocompass is a type of non-magnetic compass which is based on a fast-spinning disc and rotation of the Earth (or another planetary body if used elsewhere in the universe) to automatically find geographical direction. Although one important component of a gyrocompass is a gyroscope, these are not the same devices; a gyrocompass is built to use the effect of gyroscopic precession, which is a distinctive aspect of the general gyroscopic effect.

Gyrocompasses are widely used fornavigation on ships, because they have two significant advantages over magnetic compasses:
  • they find true north as determined by Earth's rotation, which is different from, and navigationally more useful than, magnetic north, and
  • they are unaffected by ferromagnetic materials, such as ship's steel hull, which change the magnetic field

Saturday 14 June 2014

FATHER OF COMPUTERS WHO RECEIVED DEGREE WITHOUT EXAMINATION !!!


Charles Babbage, (26 December 1791 – 18 October 1871) was an English polymath. He was a mathematician, philosopher, inventor and mechanical engineer, who is best, remembered now for originating the concept of a programmable computer. He is considered as the father of Engineer and is credited with the invention of first mechanical computer. According to the Oxford Dictionary of National Biography,he was born at 44 Crosby Row, Walworth road, London, England. Babbage was one of four children of Benjamin Babbage and Betsy Plumleigh Teape.


Babbage arrived at Trinity college in Cambridge, in October 1810, however, he was disappointed by the standard mathematical instruction available at the university of Cambridge. As a student, Babbage was also a member of other societies such as The Ghost Club, concerned with investigating supernatural phenomena, and the Extractors Club, dedicated to liberating its members from the madhouse, should any be committed to one. He was a top mathematician in Cambridge, however didn’t completed his graduation in Honors as was awarded his degree without giving the Examination.

 Astronomical Society in 1820. Its initial aims were to reduce astronomical calculations to a more standard form, and to circulate data. These directions were closely connected with Babbage's ideas on computation, and in 1824 he won its Gold medal, cited "for his invention of an engine for calculating mathematical and astronomical tables". The Analytical Society had initially been no more than an undergraduate provocation. During this period it had some more substantial achievements. In 1816 Babbage, Herschel and Peacock published a translation from French of the lectures of Sylvestre Lacroix, which was then the state-of-the-art calculus textbook. Reference to Lagrange in calculus terms marks out the application of what are now called formal power series. British mathematicians had used them from about 1730 to 1760.


As re-introduced, they were not simply applied as notations in differential calculus. They opened up the fields of Functional Equations (including the differential equations fundamental to the difference engine) and operator (D-module) methods for differential Equations (division of labour). As Babbage himself noted, it had already appeared in the work of Melchiorre Gioia in 1815.  The term was introduced in 1974 by Harry Braverman. Related formulations are the "principle of multiples" of Philip Sargant Florence, and the "balance of processes". 

species , rather than continually interfering with ad hoc miracles each time a new species was required. In Vestiges the parallel with Babbage's computing machines is made explicit, as allowing plausibility to the theory that transmutation of species could be pre-programmed.
A project announced by Babbage was to tabulate all physical constants (referred to as "constants of nature", a phrase in itself a neologism), and then to compile an encyclopedic work of numerical information. He was a pioneer in the field of "absolute measurement”.


 Babbage's machines were among the first mechanical computers. That they were not actually completed was largely because of funding problems and personality issues. Babbage directed the building of some steam-powered machines that achieved some modest success, suggesting that calculations could be mechanized. For more than ten years he received government funding for his project, which amounted to £17,000, but eventually the Treasury lost confidence in him.

There is a green plaque commemorating the 40 years Babbage spent at 1 Dorset St, London.

Friday 13 June 2014

A GENIUS, A POLYMATH ....'A BEAUTIFUL MIND' INDEED......so worthy a film was made after him!!!

John Forbes Nash, Jr. (born June 13, 1928) is an American mathematician whose works in game theorydifferential geometry, and partial differential equations have provided insight into the factors that govern chance and events inside complex systems in daily life. His theories are used in market economics, computing, evolutionary biologyartificial intelligence, accounting, politics and military theory. Serving as a Senior Research Mathematician atPrinceton University during the latter part of his life, he shared the 1994 Nobel Memorial Prize in Economic Sciences with game theorists Reinhard Selten andJohn Harsanyi.

Nash is the subject of the 2001 Hollywood movie A Beautiful Mind. The film, loosely based on the biography of the same name, focuses on Nash's mathematical genius and also his schizophrenia.

He was  born in Bluefield, West Virginia. His parents and grandparents provided books and encyclopedias that he learned from. Nash's grandmother played piano at home, and Nash had positive memories of listening to her when he visited. Nash's parents pursued opportunities to supplement their son's education, and arranged for him to take advanced mathematics courses at a local community college during his final year of high school. Nash attended Carnegie Institute of Technology (now Carnegie Mellon University) with a full scholarship, the George Westinghouse Scholarship, and initially majored in Chemical Engineering. He switched to Chemistry, and eventually to Mathematics.

Nash's advisor and former Carnegie Tech professor R. J. Duffin wrote a letter of recommendation consisting of a single sentence: "This man is a genius." Nash was accepted by Harvard University, but the chairman of the mathematics department of Princeton, Solomon Lefschetz, offered him the John S. Kennedy fellowship, which was enough to convince Nash that Harvard valued him less. Nash also considered Princeton more favorably because of its geographic location much closer to his family in Bluefield. He went to Princeton where he worked on his equilibrium theory.

In 1951, Nash went to the Massachusetts Institute of Technology as a C. L. E. Moore Instructor in the mathematics faculty. There, he met Alicia Lopez-Harrison de Lardé (born January 1, 1933), a naturalized U.S. citizen from El Salvador. De Lardé graduated from M.I.T., having majored in physics. They married in February 1957 at a Catholic ceremony, although Nash was an atheist. Nash experienced the first symptoms of mental illness in early 1959, when his wife was pregnant with their child. 

He resigned his position as member of the M.I.T. mathematics faculty in the spring of 1959. Nash's wife admitted Nash to the McLean Hospital for schizophrenia in 1959; their son, John Charles Martin Nash, was born soon afterward, but remained nameless for a year because his mother felt that her husband should have a say in the name. Nash and de Lardé divorced in 1963, though after his final hospital discharge in 1970, Nash lived in de Lardé's house. They remarried in 2001.


Nash began to show signs of extreme paranoia and his wife later described his behavior as erratic, as he began speaking of characters like Charles Herman and William Parcher who were putting him in danger. Nash seemed to believe that all men who wore red ties were part of a communist conspiracy against him. Nash mailed letters to embassies in Washington, D.C., declaring that they were establishing a government.


He was admitted to the McLean Hospital, April–May 1959, where he was diagnosed with paranoid schizophrenia. The clinical picture is dominated by relatively stable, often paranoid, fixed beliefs that are either false, over-imaginative or unrealistic, usually accompanied by experiences of seemingly real perception of something not actually present — particularly auditory and perceptional disturbances, a lack of motivation for life, and mild clinical depression.

He has described a process of change "from scientific rationality of thinking into the delusional thinking characteristic of persons who are psychiatrically diagnosed as 'schizophrenic' or 'paranoid schizophrenic'"including seeing himself as a messenger or having a special function in some way, and with supporters and opponents and hidden schemers, and a feeling of being persecuted, and looking for signs representing divine revelation. 

Nash has suggested his delusional thinking was related to his unhappiness and his striving to feel important and be recognized, and to his characteristic way of thinking such that "I wouldn't have had good scientific ideas if I had thought more normally." He has said, "If I felt completely pressureless I don't think I would have gone in this pattern".

He does not see a categorical distinction between terms such as schizophrenia and bipolar disorder. Nash reports that he did not hear voices until around 1964, later engaging in a process of rejecting them. He reports that he was always taken to hospitals against his will, and only temporarily renounced his "dream-like delusional hypotheses" after being in a hospital long enough to decide to superficially conform – to behave normally or to experience "enforced rationality". 

Only gradually on his own did he "intellectually reject" some of the "delusionally influenced" and "politically oriented" thinking as a waste of effort. However, by 1995, although he was "thinking rationally again in the style that is characteristic of scientists," he says he also felt more limited.