Engineering is the application of knowledge in the form of science and empirical evidence, to the innovation, construction and maintenance of structures, materials, devices, systems and organizations. The discipline of engineering encompasses a broad range of more specialized fields of engineering, each with a more specific emphasis on particular areas of applied mathematics, applied science, types of application. See glossary of engineering; the term engineering is derived from the Latin ingenium, meaning "cleverness" and ingeniare, meaning "to contrive, devise". The American Engineers' Council for Professional Development has defined "engineering" as: The creative application of scientific principles to design or develop structures, apparatus, or manufacturing processes, or works utilizing them singly or in combination. Engineering has existed since ancient times, when humans devised inventions such as the wedge, lever and pulley; the term engineering is derived from the word engineer, which itself dates back to 1390 when an engine'er referred to "a constructor of military engines."
In this context, now obsolete, an "engine" referred to a military machine, i.e. a mechanical contraption used in war. Notable examples of the obsolete usage which have survived to the present day are military engineering corps, e.g. the U. S. Army Corps of Engineers; the word "engine" itself is of older origin deriving from the Latin ingenium, meaning "innate quality mental power, hence a clever invention."Later, as the design of civilian structures, such as bridges and buildings, matured as a technical discipline, the term civil engineering entered the lexicon as a way to distinguish between those specializing in the construction of such non-military projects and those involved in the discipline of military engineering. The pyramids in Egypt, the Acropolis and the Parthenon in Greece, the Roman aqueducts, Via Appia and the Colosseum, Teotihuacán, the Brihadeeswarar Temple of Thanjavur, among many others, stand as a testament to the ingenuity and skill of ancient civil and military engineers.
Other monuments, no longer standing, such as the Hanging Gardens of Babylon, the Pharos of Alexandria were important engineering achievements of their time and were considered among the Seven Wonders of the Ancient World. The earliest civil engineer known by name is Imhotep; as one of the officials of the Pharaoh, Djosèr, he designed and supervised the construction of the Pyramid of Djoser at Saqqara in Egypt around 2630–2611 BC. Ancient Greece developed machines in both military domains; the Antikythera mechanism, the first known mechanical computer, the mechanical inventions of Archimedes are examples of early mechanical engineering. Some of Archimedes' inventions as well as the Antikythera mechanism required sophisticated knowledge of differential gearing or epicyclic gearing, two key principles in machine theory that helped design the gear trains of the Industrial Revolution, are still used today in diverse fields such as robotics and automotive engineering. Ancient Chinese, Greek and Hungarian armies employed military machines and inventions such as artillery, developed by the Greeks around the 4th century BC, the trireme, the ballista and the catapult.
In the Middle Ages, the trebuchet was developed. Before the development of modern engineering, mathematics was used by artisans and craftsmen, such as millwrights, clock makers, instrument makers and surveyors. Aside from these professions, universities were not believed to have had much practical significance to technology. A standard reference for the state of mechanical arts during the Renaissance is given in the mining engineering treatise De re metallica, which contains sections on geology and chemistry. De re metallica was the standard chemistry reference for the next 180 years; the science of classical mechanics, sometimes called Newtonian mechanics, formed the scientific basis of much of modern engineering. With the rise of engineering as a profession in the 18th century, the term became more narrowly applied to fields in which mathematics and science were applied to these ends. In addition to military and civil engineering, the fields known as the mechanic arts became incorporated into engineering.
Canal building was an important engineering work during the early phases of the Industrial Revolution. John Smeaton was the first self-proclaimed civil engineer and is regarded as the "father" of civil engineering, he was an English civil engineer responsible for the design of bridges, canals and lighthouses. He was a capable mechanical engineer and an eminent physicist. Using a model water wheel, Smeaton conducted experiments for seven years, determining ways to increase efficiency. Smeaton introduced iron gears to water wheels. Smeaton made mechanical improvements to the Newcomen steam engine. Smeaton designed the third Eddystone Lighthouse where he pioneered the use of'hydraulic lime' and developed a technique involving dovetailed blocks of granite in the building of the lighthouse, he is important in the history, rediscovery of, development of modern cement, because he identified the compositional requirements needed to obtain "hydraulicity" in lime.
Electroputere S. A. is a company based in Romania. Founded in 1949, it is one of the largest industrial companies in Romania. Electroputere has produced more than 2,400 diesel locomotives, 1,050 electric locomotives for the Romanian, Bulgarian and Polish railways, additionally producing other urban vehicles and complex equipment. Electroputere are manufactures of: Industrial electrical parts - circuit breakers, transformers etc. Industrial electric motors & Converters Heavy duty power transformers Urban vehicles, they have divisions specialising in: Forging and molding metal Equipment repairing Tools modernisation. A total of 1,105 locomotives were delivered between 1972—1991 to railway companies in the following countries: Bulgaria China Greece Iran Poland United Kingdom YugoslaviaOne of its more notable foreign orders was for the Class 56 locomotives for British Rail; the 30 locomotives were outsourced to Electroputere because Brush Traction could not build them at its own plant. Romanian Railways - Căile Ferate Române Electroputere official site CFR 2,100hp Co-Co Locomotive
British Railways, which from 1965 traded as British Rail, was the state-owned company that operated most of the overground rail transport in Great Britain between 1948 and 1997. It was formed from the nationalisation of the "Big Four" British railway companies and lasted until the gradual privatisation of British Rail, in stages between 1994 and 1997. A trading brand of the Railway Executive of the British Transport Commission, it became an independent statutory corporation in 1962 designated as the British Railways Board; the period of nationalisation saw sweeping changes in the national railway network. A process of dieselisation and electrification took place, by 1968 steam locomotion had been replaced by diesel and electric traction, except for the Vale of Rheidol Railway. Passengers replaced freight as the main source of business, one third of the network was closed by the Beeching Axe of the 1960s in an effort to reduce rail subsidies. On privatisation, responsibility for track and stations was transferred to Railtrack and that for trains to the train operating companies.
The British Rail "double arrow" logo is formed of two interlocked arrows showing the direction of travel on a double track railway and was nicknamed "the arrow of indecision". It is now employed as a generic symbol on street signs in Great Britain denoting railway stations, as part of the Rail Delivery Group's jointly-managed National Rail brand is still printed on railway tickets; the rail transport system in Great Britain developed during the 19th century. After the grouping of 1923 under the Railways Act 1921, there were four large railway companies, each dominating its own geographic area: the Great Western Railway, the London and Scottish Railway, the London and North Eastern Railway and the Southern Railway. During World War I the railways were under state control, which continued until 1921. Complete nationalisation had been considered, the Railways Act 1921 is sometimes considered as a precursor to that, but the concept was rejected. Nationalisation was subsequently carried out after World War II, under the Transport Act 1947.
This Act made provision for the nationalisation of the network, as part of a policy of nationalising public services by Clement Attlee's Labour Government. British Railways came into existence as the business name of the Railway Executive of the British Transport Commission on 1 January 1948 when it took over the assets of the Big Four. There were joint railways between the Big Four and a few light railways to consider. Excluded from nationalisation were industrial lines like the Oxfordshire Ironstone Railway; the London Underground – publicly owned since 1933 – was nationalised, becoming the London Transport Executive of the British Transport Commission. The Bicester Military Railway was run by the government; the electric Liverpool Overhead Railway was excluded from nationalisation. The Railway Executive was conscious that some lines on the network were unprofitable and hard to justify and a programme of closures began immediately after nationalisation. However, the general financial position of BR became poorer, until an operating loss was recorded in 1955.
The Executive itself had been abolished in 1953 by the Conservative government, control of BR transferred to the parent Commission. Other changes to the British Transport Commission at the same time included the return of road haulage to the private sector. British Railways was divided into regions which were based on the areas the former Big Four operated in. Notably, these included the former Great Central lines from the Eastern Region to the London Midland Region, the West of England Main Line from the Southern Region to Western Region Southern Region: former Southern Railway lines. Western Region: former Great Western Railway lines. London Midland Region: former London Midland and Scottish Railway lines in England and Wales. Eastern Region: former London and North Eastern Railway lines south of York. North Eastern Region: former London and North Eastern Railway lines in England north of York. Scottish Region: all lines, regardless of original company, in Scotland; the North Eastern Region was merged with the Eastern Region in 1967.
In 1982, the regions were abolished and replaced by "business sectors", a process known as sectorisation. The Anglia Region was created in late 1987, its first General Manager being John Edmonds, who began his appointment on 19 October 1987. Full separation from the Eastern Region – apart from engineering design needs – occurred on 29 April 1988, it handled the services from Fenchurch Street and Liverpool Street, its western boundary being Hertford East and Whittlesea. The report, latterly known as the "Modernisation Plan", was published in January 1955, it was intended to bring the railway system into the 20th century. A government White Paper produced in 1956 stated that modernisation would help eliminate BR's financial deficit by 1962, but the figures in both this and the original plan were produced for political reasons and not based on detailed analysis; the aim was to increase speed, reliability and line capacity through a series of measures that would make services more attractive to passengers and freight operators, thus recovering traffic lost to the roads.
Important areas included: Electrification of principal main lines, in the Eastern Region, Birmingham to Liverpool/Manchester and Central Scotland Large-scale dieselisation to replace steam locomotives New passenger and freight rolling stock R
In electricity generation, a generator is a device that converts motive power into electrical power for use in an external circuit. Sources of mechanical energy include steam turbines, gas turbines, water turbines, internal combustion engines and hand cranks; the first electromagnetic generator, the Faraday disk, was invented in 1831 by British scientist Michael Faraday. Generators provide nearly all of the power for electric power grids; the reverse conversion of electrical energy into mechanical energy is done by an electric motor, motors and generators have many similarities. Many motors can be mechanically driven to generate electricity and make acceptable manual generators. Electromagnetic generators fall into one of two broad categories and alternators. Dynamos generate pulsing direct current through the use of a commutator. Alternators generate alternating current. Mechanically a generator consists of a rotating part and a stationary part: Rotor The rotating part of an electrical machine.
Stator The stationary part of an electrical machine, which surrounds the rotor. One of these parts generates a magnetic field, the other has a wire winding in which the changing field induces an electric current: Field winding or field magnets The magnetic field producing component of an electrical machine; the magnetic field of the dynamo or alternator can be provided by either wire windings called field coils or permanent magnets. Electrically-excited generators include an excitation system to produce the field flux. A generator using permanent magnets is sometimes called a magneto, or permanent magnet synchronous generators. Armature The power-producing component of an electrical machine. In a generator, alternator, or dynamo, the armature windings generate the electric current, which provides power to an external circuit; the armature can be on either the rotor or the stator, depending on the design, with the field coil or magnet on the other part. Before the connection between magnetism and electricity was discovered, electrostatic generators were invented.
They operated on electrostatic principles, by using moving electrically charged belts and disks that carried charge to a high potential electrode. The charge was generated using either of two mechanisms: electrostatic induction or the triboelectric effect; such generators generated high voltage and low current. Because of their inefficiency and the difficulty of insulating machines that produced high voltages, electrostatic generators had low power ratings, were never used for generation of commercially significant quantities of electric power, their only practical applications were to power early X-ray tubes, in some atomic particle accelerators. The operating principle of electromagnetic generators was discovered in the years of 1831–1832 by Michael Faraday; the principle called Faraday's law, is that an electromotive force is generated in an electrical conductor which encircles a varying magnetic flux. He built the first electromagnetic generator, called the Faraday disk, it produced a small DC voltage.
This design was inefficient, due to self-cancelling counterflows of current in regions of the disk that were not under the influence of the magnetic field. While current was induced directly underneath the magnet, the current would circulate backwards in regions that were outside the influence of the magnetic field; this counterflow limited the power output to the pickup wires, induced waste heating of the copper disc. Homopolar generators would solve this problem by using an array of magnets arranged around the disc perimeter to maintain a steady field effect in one current-flow direction. Another disadvantage was that the output voltage was low, due to the single current path through the magnetic flux. Experimenters found that using multiple turns of wire in a coil could produce higher, more useful voltages. Since the output voltage is proportional to the number of turns, generators could be designed to produce any desired voltage by varying the number of turns. Wire windings became a basic feature of all subsequent generator designs.
Independently of Faraday, the Hungarian Ányos Jedlik started experimenting in 1827 with the electromagnetic rotating devices which he called electromagnetic self-rotors. In the prototype of the single-pole electric starter both the stationary and the revolving parts were electromagnetic, it was the discovery of the principle of dynamo self-excitation, which replaced permanent magnet designs. He may have formulated the concept of the dynamo in 1861 but didn't patent it as he thought he wasn't the first to realize this. A coil of wire rotating in a magnetic field produces a current which changes direction with each 180° rotation, an alternating current; however many early uses of electricity required direct current. In the first practical electric generators, called dynamos, the AC was converted into DC with a commutator, a set of rotating switch contacts on the armature shaft; the commutator reversed the connection of the armature winding to the circuit every 180° rotation of the shaft, creating a pulsing DC current.
One of the first dynamos was built by Hippolyte Pixii in 1832. The dynamo was the first electrical generator capable of delivering power for industry; the Woolrich Electrical Generator of 1844, now in Thinktank, Birmingham Science Museum, is the earliest electrical generator used in an industrial process. It was used by the firm of Elkingtons for commercial electroplating; the modern dynamo, fit for use in industrial applications, was invented independently by Sir Charles
Union Pacific Railroad
Union Pacific Railroad is a freight hauling railroad that operates 8,500 locomotives over 32,100 route-miles in 23 states west of Chicago and New Orleans. The Union Pacific Railroad system is the second largest in the United States after the BNSF Railway and is one of the world's largest transportation companies; the Union Pacific Railroad is the principal operating company of the Union Pacific Corporation. Union Pacific is known for pioneering multiple innovative locomotives the most powerful of their era; these include members of the Challenger-type, the Northern-type, as well as the famous Big Boy steam locomotives. Union Pacific ordered the first streamliner, the largest fleet of turbine-electric locomotives in the world, still owns the largest operational diesel locomotive; the Union Pacific legacy began in 1862 with the original company, called the Union Pacific Rail Road, part of the First Transcontinental Railroad project known as the Overland Route. The railroad would subsequently be reorganized thrice: as the Union Pacific Railway, as the Union Pacific "Railroad", as a renamed Southern Pacific Transportation Company.
The current Union Pacific corporation began in 1969 as the Southern Pacific Transportation Company, itself created in a reorganization of a railroad whose legacy dated to 1865. Over the years it would grow to include the Denver and Rio Grande Western Railroad and the St. Louis Southwestern Railway, in addition to its eponymous railroad; the 1998 Union Pacific-Southern Pacific merger was not UP's first: Union Pacific had merged with Missouri Pacific Railroad, the Chicago and North Western Transportation Company, the Western Pacific Railroad and the Missouri–Kansas–Texas Railroad. However, because the merger with Southern Pacific changed the scope of the Union Pacific railroad, this article will refer to the unmerged system as Union Pacific, the merged system as Union Pacific. Union Pacific's main competitor is the BNSF Railway, the nation's largest freight railroad by volume, which primarily services the Continental U. S. west of the Mississippi River. Together, the two railroads have a duopoly on all transcontinental freight rail lines in the U.
S. The original company, the Union Pacific Rail Road was incorporated on July 1, 1862, under an act of Congress entitled Pacific Railroad Act of 1862; the act was approved by President Abraham Lincoln, it provided for the construction of railroads from the Missouri River to the Pacific as a war measure for the preservation of the Union. It was constructed westward from Council Bluffs, Iowa to meet the Central Pacific Railroad line, constructed eastward from Sacramento, CA; the combined Union Pacific-Central Pacific line became known as the First Transcontinental Railroad and the Overland Route. The line was constructed by Irish labor who had learned their craft during the recent Civil War. Under the guidance of its dominant stockholder Dr. Thomas Clark Durant, the namesake of the city of Durant, the first rails were laid in Omaha; the two lines were joined together at Promontory Summit, Utah, 53 miles west of Ogden on May 10, 1869, hence creating the first transcontinental railroad in North America.
Subsequently, the UP purchased three Mormon-built roads: the Utah Central Railroad extending south from Ogden to Salt Lake City, the Utah Southern Railroad extending south from Salt Lake City into the Utah Valley, the Utah Northern Railroad extending north from Ogden into Idaho. The original UP was entangled in the Crédit Mobilier scandal, exposed in 1872; as detailed by The Sun, Union Pacific's largest construction company, Crédit Mobilier, had overcharged Union Pacific. In order to convince the federal government to accept the increased costs, Crédit Mobilier had bribed congressmen. Although the UP corporation itself was not guilty of any misdeeds, prominent UP board members had been involved in the scheme; the ensuing financial crisis of 1873 led to a credit crunch, but not bankruptcy. As boom followed bust, the Union Pacific continued to expand; the original company was purchased by a new company on January 24, 1880, with dominant stockholder Jay Gould. Gould owned the Kansas Pacific, sought to merge it with UP.
Thusly was the original "Union Pacific Rail Road" transformed into "Union Pacific Railway."Extending towards the Pacific Northwest, Union Pacific built or purchased local lines that gave it access to Portland, Oregon. Towards Colorado, it built the Union Pacific and Gulf Railway: both narrow gauge trackage into the heart of the Rockies and a standard gauge line that ran south from Denver, across New Mexico, into Texas; the Union Pacific Railway would declare bankruptcy during the Panic of 1893. Again, a new Union Pacific "Railroad" was formed and Union Pacific "Railway" merged into the new corporation. In the early 20th century, Union Pacific's focus shifted from expansion to internal improvement. Recognizing that farmers in the Central and Salinas Valleys of California grew produce far in excess of local markets, Union Pacific worked with its rival Southern Pacific to develop a rail-based transport system, not vulnerable to spoilage; these efforts came culminated in the 1906 founding of
A compressor is a mechanical device that increases the pressure of a gas by reducing its volume. An air compressor is a specific type of gas compressor. Compressors are similar to pumps: both increase the pressure on a fluid and both can transport the fluid through a pipe; as gases are compressible, the compressor reduces the volume of a gas. Liquids are incompressible; the main and important types of gas compressors are illustrated and discussed below: A positive displacement compressor is a system which compresses the air by the displacement of a mechanical linkage reducing the volume. Reciprocating compressors use pistons driven by a crankshaft, they can be either stationary or portable, can be single or multi-staged, can be driven by electric motors or internal combustion engines. Small reciprocating compressors from 5 to 30 horsepower are seen in automotive applications and are for intermittent duty. Larger reciprocating compressors well over 1,000 hp are found in large industrial and petroleum applications.
Discharge pressures can range from low pressure to high pressure. In certain applications, such as air compression, multi-stage double-acting compressors are said to be the most efficient compressors available, are larger, more costly than comparable rotary units. Another type of reciprocating compressor employed in automotive cabin air conditioning systems, is the swash plate or wobble plate compressor, which uses pistons moved by a swash plate mounted on a shaft. Household, home workshop, smaller job site compressors are reciprocating compressors 1½ hp or less with an attached receiver tank. A linear compressor is a reciprocating compressor with the piston being the rotor of a linear motor. An ionic liquid piston compressor, ionic compressor or ionic liquid piston pump is a hydrogen compressor based on an ionic liquid piston instead of a metal piston as in a piston-metal diaphragm compressor. Rotary screw compressors use two meshed rotating positive-displacement helical screws to force the gas into a smaller space.
These are used for continuous operation in commercial and industrial applications and may be either stationary or portable. Their application can be from 3 horsepower to over 1,200 horsepower and from low pressure to moderately high pressure; the classifications of rotary screw compressors vary based on stages, cooling methods, drive types among others. Rotary screw compressors are commercially produced in Water Flooded and Dry type; the efficiency of rotary compressors depends on the air drier, the selection of air drier is always 1.5 times volumetric delivery of the compressor. Designs with a single screw or three screws instead of two exist. Rotary vane compressors consist of a rotor with a number of blades inserted in radial slots in the rotor; the rotor is mounted offset in a larger housing, either circular or a more complex shape. As the rotor turns, blades slide in and out of the slots keeping contact with the outer wall of the housing. Thus, a series of increasing and decreasing volumes is created by the rotating blades.
Rotary Vane compressors are, with piston compressors one of the oldest of compressor technologies. With suitable port connections, the devices may be either a vacuum pump, they can be either stationary or portable, can be single or multi-staged, can be driven by electric motors or internal combustion engines. Dry vane machines are used at low pressures for bulk material movement while oil-injected machines have the necessary volumetric efficiency to achieve pressures up to about 13 bar in a single stage. A rotary vane compressor is well suited to electric motor drive and is quieter in operation than the equivalent piston compressor. Rotary vane compressors can have mechanical efficiencies of about 90%; the Rolling piston in a rolling piston style compressor plays the part of a partition between the vane and the rotor. Rolling piston forces gas against a stationary vane. 2 of these compressors can be mounted on the same shaft to increase capacity and reduce vibration and noise. A design without a spring is known as a swing compressor.
In refrigeration and air conditioning, this type of compressor is known as a rotary compressor, with rotary screw compressors being known as screw compressors. A scroll compressor known as scroll pump and scroll vacuum pump, uses two interleaved spiral-like vanes to pump or compress fluids such as liquids and gases; the vane geometry may be archimedean spiral, or hybrid curves. They operate more smoothly and reliably than other types of compressors in the lower volume range. One of the scrolls is fixed, while the other orbits eccentrically without rotating, thereby trapping and pumping or compressing pockets of fluid between the scrolls. Due to minimum clearance volume between the fixed scroll and the orbiting scroll, these compressors have a high volumetric efficiency; these compressors are extensively used in air conditioning and refrigeration because they are lighter and have fewer moving parts than reciprocating compressors and they are more reliable. They are more expensive though, so peltier coolers or rotary and reciprocating compressors may be used in applications where cost is the most important or one of the most important factors to consider when designing a refrigeration or air conditioining
An engine or motor is a machine designed to convert one form of energy into mechanical energy. Heat engines, like the internal combustion engine, burn a fuel to create heat, used to do work. Electric motors convert electrical energy into mechanical motion, pneumatic motors use compressed air, clockwork motors in wind-up toys use elastic energy. In biological systems, molecular motors, like myosins in muscles, use chemical energy to create forces and motion; the word engine derives from Old French engin, from the Latin ingenium–the root of the word ingenious. Pre-industrial weapons of war, such as catapults and battering rams, were called siege engines, knowledge of how to construct them was treated as a military secret; the word gin, as in cotton gin, is short for engine. Most mechanical devices invented during the industrial revolution were described as engines—the steam engine being a notable example. However, the original steam engines, such as those by Thomas Savery, were not mechanical engines but pumps.
In this manner, a fire engine in its original form was a water pump, with the engine being transported to the fire by horses. In modern usage, the term engine describes devices, like steam engines and internal combustion engines, that burn or otherwise consume fuel to perform mechanical work by exerting a torque or linear force. Devices converting heat energy into motion are referred to as engines. Examples of engines which exert a torque include the familiar automobile gasoline and diesel engines, as well as turboshafts. Examples of engines which produce thrust include rockets; when the internal combustion engine was invented, the term motor was used to distinguish it from the steam engine—which was in wide use at the time, powering locomotives and other vehicles such as steam rollers. The term motor derives from the Latin verb moto which means to maintain motion, thus a motor is a device. Motor and engine are interchangeable in standard English. In some engineering jargons, the two words have different meanings, in which engine is a device that burns or otherwise consumes fuel, changing its chemical composition, a motor is a device driven by electricity, air, or hydraulic pressure, which does not change the chemical composition of its energy source.
However, rocketry uses the term rocket motor though they consume fuel. A heat engine may serve as a prime mover—a component that transforms the flow or changes in pressure of a fluid into mechanical energy. An automobile powered by an internal combustion engine may make use of various motors and pumps, but all such devices derive their power from the engine. Another way of looking at it is that a motor receives power from an external source, converts it into mechanical energy, while an engine creates power from pressure. Simple machines, such as the club and oar, are prehistoric. More complex engines using human power, animal power, water power, wind power and steam power date back to antiquity. Human power was focused by the use of simple engines, such as the capstan, windlass or treadmill, with ropes and block and tackle arrangements; these were used in cranes and aboard ships in Ancient Greece, as well as in mines, water pumps and siege engines in Ancient Rome. The writers of those times, including Vitruvius and Pliny the Elder, treat these engines as commonplace, so their invention may be more ancient.
By the 1st century AD, cattle and horses were used in mills, driving machines similar to those powered by humans in earlier times. According to Strabo, a water powered mill was built in Kaberia of the kingdom of Mithridates during the 1st century BC. Use of water wheels in mills spread throughout the Roman Empire over the next few centuries; some were quite complex, with aqueducts and sluices to maintain and channel the water, along with systems of gears, or toothed-wheels made of wood and metal to regulate the speed of rotation. More sophisticated small devices, such as the Antikythera Mechanism used complex trains of gears and dials to act as calendars or predict astronomical events. In a poem by Ausonius in the 4th century AD, he mentions a stone-cutting saw powered by water. Hero of Alexandria is credited with many such wind and steam powered machines in the 1st century AD, including the Aeolipile and the vending machine these machines were associated with worship, such as animated altars and automated temple doors.
Medieval Muslim engineers employed gears in mills and water-raising machines, used dams as a source of water power to provide additional power to watermills and water-raising machines. In the medieval Islamic world, such advances made it possible to mechanize many industrial tasks carried out by manual labour. In 1206, al-Jazari employed a crank-conrod system for two of his water-raising machines. A rudimentary steam turbine device was described by Taqi al-Din in 1551 and by Giovanni Branca in 1629. In the 13th century, the solid rocket motor was invented in China. Driven by gunpowder, this simplest form of internal combustion engine was unable to deliver sustained power, but was useful for propelling weaponry at high speeds towards enemies in battle and for fireworks. After invention, this innovation spread throughout Europe; the Watt steam engine was the first type of steam engine to make use of steam at a pressure just above atmospheric to drive the piston he