Sunday, March 1, 2009
Marie Curie
Aristoteles
James Watt
ames Watt was a genius of many talents who was at the heart of the technological and economic changes in 18th century Britain that have been described as the Industrial Revolution.
He was born in Greenock, the son of James Watt (1698-1782), a prosperous merchant and prominent citizen of the Scottish port. He had a talent for mathematics, and trained as a maker of mathematical instruments in Glasgow, making a visit to London to gain professional experience in 1755-6. He gained the acquaintance of the celebrated Dr Joseph Black (1728-99) of Glasgow University who described him as ‘a young man possessing most uncommon talents for mechanical knowledge and practice’. He learned German and Italian, took an interest in several new technologies, including the manufacture of porcelain, and carried out surveys of several Scottish waterways, including the Caledonian Canal, that were subsequently praised by Thomas Telford.
His main interest was in the improvement of the steam engine, and after erecting several Newcomen engines in Scotland in 1765-6, he took out his first patent, for the separate condenser, in 1769. He moved to Birmingham in 1774 where, he worked in partnership with Matthew Boulton (1728-1809), to develop the steam engine. The first engines to incorporate his improvements were erected in 1776. Initially the Boulton and Watt partnership supplied only drawings, some key components such as valves, and the services of erectors.
Watt was only one of many engineers developing steam power in the late 18th century, and his application of sun-and-planet gearing to achieve rotative motion, patented in 1782, was dictated by the granting of a patent to James Pickard for the use of the crank for this purpose. Watt was concerned to ensure that high standards were achieved in his engines, and would use only Swedish iron purchased from merchants in Birmingham for some engine parts. He supplied his first overseas order in 1778, and by 1800, when his patents expired, Boulton & Watt had despatched 24 engines to customers in France, Germany, Italy, Spain, Netherlands, Austria, Sweden and Russia.
In the 1790s it became evident that other engine builders, notably the ironmaster John Wilkinson, had infringed the Watt patents by building ‘pirate’ engines. Watt developed elements of paranoia over such infringements, but after the partners established their own engine-building facilities, by opening the Soho Foundry in 1796, he gradually retired from the business. In the interval of peace that followed the treaty of Amiens in 1802 he visited Frankfurt, Strasburg and Paris.
Watt also developed a copying process in 1781. Copies were kept of engine drawings and of the outgoing letters of the partnership, while incoming letters were also preserved, making the Boulton & Watt Collection in Birmingham one of the most important archives of the Industrial Revolution.
Watt retained throughout his life interests in geology, mineralogy and chemistry, and was honoured for his scientific achievements in Russia, the Netherlands and France, but never regarded his own achievements as in any way heroic.
Friday, September 12, 2008
Archimedes
Archimedes of Syracuse (c. 287 BC – c. 212 BC) was a Greek mathematician, physicist, engineer, inventor, and astronomer. Although few details of his life are known, he is regarded as one of the leading scientists in classical antiquity. Among his advances in physics are the foundations of hydrostatics, statics and the explanation of the principle of the lever. He is credited with designing innovative machines, including siege engines and the screw pump that bears his name. Modern experiments have tested claims that Archimedes designed machines capable of lifting attacking ships out of the water and setting ships on fire using an array of mirrors.
Archimedes is generally considered to be the greatest mathematician of antiquity and one of the greatest of all time. He used the method of exhaustion to calculate the area under the arc of a parabola with the summation of an infinite series, and gave a remarkably accurate approximation of Pi.He also defined the spiral bearing his name, formulas for the volumes of surfaces of revolution and an ingenious system for expressing very large numbers.
Archimedes died during the Siege of Syracuse when he was killed by a Roman soldier despite orders that he should not be harmed. Cicero describes visiting the tomb of Archimedes, which was surmounted by a sphere inscribed within a cylinder. Archimedes had proved that the sphere has two thirds of the volume and surface area of the cylinder (including the bases of the latter), and regarded this as the greatest of his mathematical achievements.
Unlike his inventions, the mathematical writings of Archimedes were little known in antiquity. Mathematicians from Alexandria read and quoted him, but the first comprehensive compilation was made only by Isidore of Miletus (c. 530 AD), while commentaries on the works of Archimedes written by Eutocius in the sixth century AD opened them to wider readership for the first time. The relatively few copies of Archimedes' written work that survived through the Middle Ages were an influential source of ideas for scientists during the Renaissance, while the discovery in 1906 of previously unknown works by Archimedes in the Archimedes Palimpsest has provided new insights into how he obtained mathematical results
Saturday, July 26, 2008
Albert Einstein

Albert Einstein (March 14, 1879 – April 18, 1955) was a German-born American theoretical physicist who is widely regarded as the greatest scientist of the 20th century. He proposed the theory of relativity and also made major contributions to the development of quantum mechanics, statistical mechanics, and cosmology. He was awarded the 1921 Nobel Prize for Physics for his explanation of the photoelectric effect and "for his services to Theoretical Physics".

1921 Nobel Prize in Physics "for his services to Theoretical Physics, and especially for his discovery of the law of the photoelectric effect" (from the official Nobel Prize announcement)
Albert Einstein's Early Work:
In 1901, he received his diploma as a teacher of physics and mathematics. Unable to find a teaching position, he went to work for the Swiss Patent Office. He obtained his doctoral degree in 1905, the same year he published four significant papers, introducing the concepts of special relativity and the photon theory of light.
Albert Einstein's Early Work:
In 1901, he received his diploma as a teacher of physics and mathematics. Unable to find a teaching position, he went to work for the Swiss Patent Office. He obtained his doctoral degree in 1905, the same year he published four significant papers, introducing the concepts of special relativity and the photon theory of light.
Albert Einstein & Scientific Revolution:
Albert Einstein's work in 1905 shook the world of physics. In his explanation of the photoelectric effect he introduced the photon theory of light. In his paper "On the Electrodynamics of Moving Bodies," he introduced the concepts of special relativity.
Einstein spent the rest of his life and career dealing with the consequences of these concepts, both by developing general relativity and by questioning the field of quantum physics on the principle that it was "spooky action at a distance."
Albert Einstein Moves to America:
In 1933, Albert Einstein renounced his German citizenship and moved to America, where he took a post at the Institute for Advanced Study in Princeton, New Jersey, as a Professor of Theoretical Physics. He gained American citizenship in 1940.
He was offered the first presidency of Israel, but he declined it, though he did help found the Hebrew University of Jerusalem.
Misconceptions About Albert Einstein:
The rumor began circulating even while Einstein was alive that he had failed mathematics courses as a child. While it is true that Einstein began to talk late - at about age 4 according to his own accounts - he never failed in mathematics, nor did he do poorly in school in general. He did fairly well in his mathematics courses throughout his education and briefly considered becoming a mathematician. He recognized early on that his gift was not in pure mathematics, a fact he lamented throughout his career as he sought out more accomplished mathematicians to assist in the formal descriptions of his theories.
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