Robert Barker (died 1745) was a British physician and inventor. He was a Fellow of the Royal Society from 1732. [1]
Barker invented both a reflecting microscope, exhibited in 1736, and "Barker's mill", a prototype reaction turbine (1743). [2] [3] According to James Dodson, he was a friend of Charles Labelye. [4] He died in London, on 9 September 1745. [5]
Barker's Mill, a rotating device powered by water and Newton's Third Law, is sometimes described as a 17th-century invention. [6] It is attributed to Dr Robert Barker F.R.S., in 1743. It was published by John Theophilus Desaguliers in his book Experimental Philosophy of 1744. [7] [3] Desaguliers, who himself demonstrated the mill to the Royal Society, attributed the principle involved to Antoine Parent. [8] French terms for the mill are tourniquet hydraulique, moulin de Parent or roue à réaction. [9] [10]
A complex timeline of development ensued.
{{cite web}}: CS1 maint: multiple names: authors list (link)
Euler's formula, named after Leonhard Euler, is a mathematical formula in complex analysis that establishes the fundamental relationship between the trigonometric functions and the complex exponential function. Euler's formula states that, for any real number x, one has where e is the base of the natural logarithm, i is the imaginary unit, and cos and sin are the trigonometric functions cosine and sine respectively. This complex exponential function is sometimes denoted cis x. The formula is still valid if x is a complex number, and is also called Euler's formula in this more general case.
The number e is a mathematical constant approximately equal to 2.71828 that is the base of the natural logarithm and exponential function. It is sometimes called Euler's number, after the Swiss mathematician Leonhard Euler, though this can invite confusion with Euler numbers, or with Euler's constant, a different constant typically denoted . Alternatively, e can be called Napier's constant after John Napier. The Swiss mathematician Jacob Bernoulli discovered the constant while studying compound interest.
Hydropower, also known as water power, is the use of falling or fast-running water to produce electricity or to power machines. This is achieved by converting the gravitational potential or kinetic energy of a water source to produce power. Hydropower is a method of sustainable energy production. Hydropower is now used principally for hydroelectric power generation, and is also applied as one half of an energy storage system known as pumped-storage hydroelectricity.
Leonhard Euler was a Swiss mathematician, physicist, astronomer, geographer, logician, and engineer who founded the studies of graph theory and topology and made pioneering and influential discoveries in many other branches of mathematics such as analytic number theory, complex analysis, and infinitesimal calculus. He also introduced much of modern mathematical terminology and notation, including the notion of a mathematical function. He is also known for his work in mechanics, fluid dynamics, optics, astronomy, and music theory. As a result, Euler has been described as a "universal genius" who "was fully equipped with almost unlimited powers of imagination, intellectual gifts and extraordinary memory".
A turbine is a rotary mechanical device that extracts energy from a fluid flow and converts it into useful work. The work produced can be used for generating electrical power when combined with a generator. A turbine is a turbomachine with at least one moving part called a rotor assembly, which is a shaft or drum with blades attached. Moving fluid acts on the blades so that they move and impart rotational energy to the rotor.
A water turbine is a rotary machine that converts kinetic energy and potential energy of water into mechanical work.
Gaspard Monge, Comte de Péluse was a French mathematician, commonly presented as the inventor of descriptive geometry, technical drawing, and the father of differential geometry. During the French Revolution he served as the Minister of the Marine, and was involved in the reform of the French educational system, helping to found the École Polytechnique.
Henry Philibert Gaspard Darcy was a French engineer who made several important contributions to hydraulics, including Darcy’s law for flow in porous media.
The year 1736 in science and technology involved some significant events.
Jean-Victor Poncelet was a French engineer and mathematician who served most notably as the Commanding General of the École Polytechnique. He is considered a reviver of projective geometry, and his work Traité des propriétés projectives des figures is considered the first definitive text on the subject since Gérard Desargues' work on it in the 17th century. He later wrote an introduction to it: Applications d'analyse et de géométrie.
John Theophilus Desaguliers was a French-born British natural philosopher, clergyman, engineer and freemason who was elected to the Royal Society in 1714 as experimental assistant to Isaac Newton. He had studied at Oxford and later popularized Newtonian theories and their practical applications in public lectures. Desaguliers's most important patron was James Brydges, 1st Duke of Chandos. As a Freemason, Desaguliers was instrumental in the success of the first Grand Lodge in London in the early 1720s and served as its third Grand Master.
Johann Andreas von Segner was a Hungarian scientist. He was born in the Kingdom of Hungary, in the former Hungarian capital city of Pozsony, or Pressburg.
James Rumsey was an American mechanical engineer chiefly known for exhibiting a boat propelled by machinery in 1787 on the Potomac River at Shepherdstown in present-day West Virginia before a crowd of local notables, including Horatio Gates. A pump driven by steam power ejected a stream of water from the stern of the boat and thereby propelled the boat forward.
Hacienda Buena Vista, also known as Hacienda Vives, was a coffee plantation located in Barrio Magueyes, Ponce, Puerto Rico. The original plantation dates from the 19th century. The plantation was started by Don Salvador de Vives in 1833.
The Barbegal aqueduct and mills was a Roman watermill complex located on the territory of the commune of Fontvieille, Bouches-du-Rhône, near the town of Arles, in southern France. The complex has been referred to as "the greatest known concentration of mechanical power in the ancient world" and the 16 overshot wheels are considered to be the largest ancient mill complex.
Claude Burdin was a French engineer. Born in Lépin-le-Lac, Savoie, when it was known as the Duchy of Savoy, he was professor at the school of mines, École nationale supérieure des mines de Saint-Étienne, in Saint-Étienne. He became a French citizen on 4 June 1817. He proposed the concept and developed the term turbine from the Greek word τύρβη, meaning "whirling" or a "vortex".
Wenceslaus Johann Gustav Karsten was a German mathematician. In 1768, Karsten published a graphic representation of infinitely many logarithms of real and complex numbers. He was a professor of Mathematics at the Universities of Rostock, Bützow and Halle.
The Bâtiment des Forces motrices (BFM), French for "Power plant building", is the power house of a former hydro power plant and waterworks in Geneva called Usine des Forces Motrices, later Usine des Forces Motrices de la Coulouvrenière.
Museo Hacienda Buena Vista is a historic coffee plantation farm museum in Barrio Magueyes, Ponce, Puerto Rico. The museum opened in 1987, and receives some 40,000 visitors a year. The museum has been described as "Puerto Rico's first living museum of art and science."