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Pinwheel Calculator
A pinwheel calculator is a class of mechanical calculator described as early as 1685, and popular in the 19th and 20th century, calculating via wheels whose number of teeth were adjustable. These wheels, also called pinwheels, could be set by using a side lever which could expose anywhere from 0 to 9 teeth, and therefore when coupled to a counter they could, at each rotation, add a number from 0 to 9 to the result. By linking these wheels with carry mechanisms a new kind of calculator engine was invented. Turn the wheels one way and one performs an addition, the other way a subtraction. As part of a redesign of the arithmometer, they reduced by an order of magnitude the cost and the size of mechanical calculators on which one could easily do the four basic operations (add, subtract, multiply and divide). Pinwheel calculators became extremely popular with the success of Thomas' Arithmometer (manufactured 1850s) and Odhner Arithmometer (manufactured 1890s). History * - In "M ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Roue à Nombre De Dents Variables (1879–1970), a naval architect famous for his design of the ''Bluenose'' fishing schooner
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Roue is a synonym for rake (character). Roue or La Roue may also refer to: *''La Roue'', a 1923 film by Abel Gance *La Roue (Brussels), a district **La Roue/Het Rad metro station, in Brussels *Rõue, a village in Estonia *William James Roué William James Roué (April 27, 1879 – January 14, 1970) was a naval architect famous for his design of the ''Bluenose'' fishing schooner, which sailed to victory in the Halifax Herald International Fisherman's competition in 1921, 1922, 1923, 19 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Warsaw, Poland
Warsaw ( pl, Warszawa, ), officially the Capital City of Warsaw,, abbreviation: ''m.st. Warszawa'' is the capital and List of cities and towns in Poland, largest city of Poland. The metropolis stands on the Vistula, River Vistula in east-central Poland, and its population is officially estimated at 1.86 million residents within a Warsaw metropolitan area, greater metropolitan area of 3.1 million residents, which makes Warsaw the List of cities in the European Union by population within city limits, 7th most-populous city in the European Union. The city area measures and comprises Districts and neighbourhoods of Warsaw, 18 districts, while the metropolitan area covers . Warsaw is an Alpha global city, a major cultural, political and Financial centre, economic hub, and the country's seat of government. Warsaw traces its origins to a small Fishing village, fishing town in Masovia. The city rose to prominence in the late 16th century, when Sigismund III decided to move ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Division (mathematics)
Division is one of the four basic operations of arithmetic, the ways that numbers are combined to make new numbers. The other operations are addition, subtraction, and multiplication. At an elementary level the division of two natural numbers is, among other possible interpretations, the process of calculating the number of times one number is contained within another. This number of times need not be an integer. For example, if 20 apples are divided evenly between 4 people, everyone receives 5 apples (see picture). The division with remainder or Euclidean division of two natural numbers provides an integer ''quotient'', which is the number of times the second number is completely contained in the first number, and a ''remainder'', which is the part of the first number that remains, when in the course of computing the quotient, no further full chunk of the size of the second number can be allocated. For example, if 21 apples are divided between 4 people, everyone receives ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Multiplication
Multiplication (often denoted by the cross symbol , by the mid-line dot operator , by juxtaposition, or, on computers, by an asterisk ) is one of the four elementary mathematical operations of arithmetic, with the other ones being addition, subtraction, and division. The result of a multiplication operation is called a ''product''. The multiplication of whole numbers may be thought of as repeated addition; that is, the multiplication of two numbers is equivalent to adding as many copies of one of them, the ''multiplicand'', as the quantity of the other one, the ''multiplier''. Both numbers can be referred to as ''factors''. :a\times b = \underbrace_ For example, 4 multiplied by 3, often written as 3 \times 4 and spoken as "3 times 4", can be calculated by adding 3 copies of 4 together: :3 \times 4 = 4 + 4 + 4 = 12 Here, 3 (the ''multiplier'') and 4 (the ''multiplicand'') are the ''factors'', and 12 is the ''product''. One of the main properties of multiplication is ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Control Knob
{{more citations needed, date=January 2017 A control knob is a rotary device used to provide manual input adjustments to a mechanical/electrical system when grasped and turned by a human operator, so that differing extent of knob rotation corresponds to different desired input. Control knobs are a simpler type of input hardware and one of the most common components in control systems, and are found on all sorts of devices from taps and gas stoves to optical microscopes, potentiometers, radio tuners and digital cameras, as well as in aircraft cockpits.https://www.amazon.com/b?node=16412811 Operation A control knob works by turning a shaft which connects to the component which produces the actual input. Common control components used include potentiometers, variable capacitors, and rotary switches. An example where the knob does not produce a variation in an electrical signal may be found in many toasters, where the darkness knob moves the thermostat A thermostat is a reg ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lever
A lever is a simple machine consisting of a beam or rigid rod pivoted at a fixed hinge, or ''fulcrum''. A lever is a rigid body capable of rotating on a point on itself. On the basis of the locations of fulcrum, load and effort, the lever is divided into three types. Also, leverage is mechanical advantage gained in a system. It is one of the six simple machines identified by Renaissance scientists. A lever amplifies an input force to provide a greater output force, which is said to provide leverage. The ratio of the output force to the input force is the mechanical advantage of the lever. As such, the lever is a mechanical advantage device, trading off force against movement. Etymology The word "lever" entered English around 1300 from Old French, in which the word was ''levier''. This sprang from the stem of the verb ''lever'', meaning "to raise". The verb, in turn, goes back to the Latin ''levare'', itself from the adjective ''levis'', meaning "light" (as in "not heavy"). The ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Felix Edmundovich Dzerzhinsky
Felix Edmundovich Dzerzhinsky ( pl, Feliks Dzierżyński ; russian: Фе́ликс Эдму́ндович Дзержи́нский; – 20 July 1926), nicknamed "Iron Felix", was a Bolshevik revolutionary and official, born into Polish nobility. From 1917 until his death in 1926, Dzerzhinsky led the first two Soviet state-security organizations, the Cheka and the OGPU, establishing a secret police for the post-revolutionary Soviet regime. He was one of the architects of the Red Terror and decossackization. Early life Felix Dzerzhinsky was born on 11 September 1877 to ethnically Polish parents of noble descent, at the Dzerzhinovo family estate, about from the small town of Ivyanets in the Minsk Governorate of the Russian Empire (now Belarus). In the Russian Empire, his family was of a type known as " column-listed nobility" (russian: столбовое дворянство, stolbovoe dvorianstvo),Igor Kuznetsov. The Chekist No.1. The life of terror parent (Чекист № ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Soviet Union
The Soviet Union,. officially the Union of Soviet Socialist Republics. (USSR),. was a transcontinental country that spanned much of Eurasia from 1922 to 1991. A flagship communist state, it was nominally a federal union of fifteen national republics; in practice, both its government and its economy were highly centralized until its final years. It was a one-party state governed by the Communist Party of the Soviet Union, with the city of Moscow serving as its capital as well as that of its largest and most populous republic: the Russian SFSR. Other major cities included Leningrad (Russian SFSR), Kiev (Ukrainian SSR), Minsk ( Byelorussian SSR), Tashkent (Uzbek SSR), Alma-Ata (Kazakh SSR), and Novosibirsk (Russian SFSR). It was the largest country in the world, covering over and spanning eleven time zones. The country's roots lay in the October Revolution of 1917, when the Bolsheviks, under the leadership of Vladimir Lenin, overthrew the Russian Provisional Government ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cheka
The All-Russian Extraordinary Commission ( rus, Всероссийская чрезвычайная комиссия, r=Vserossiyskaya chrezvychaynaya komissiya, p=fsʲɪrɐˈsʲijskəjə tɕrʲɪzvɨˈtɕæjnəjə kɐˈmʲisʲɪjə), abbreviated as VChK ( rus, ВЧК, p=vɛ tɕe ˈka), and commonly known as Cheka ( rus, Чека, p=tɕɪˈka; from the initialism russian: ЧК, ChK, label=none), was the first of a succession of Soviet secret-police organizations. Established on December 5 (Old Style) 1917 by the Sovnarkom, it came under the leadership of Felix Dzerzhinsky, a Polish aristocrat-turned-Bolshevik. By late 1918, hundreds of Cheka committees had sprung up in the RSFSR at the oblast, guberniya, raion, uyezd, and volost levels. Ostensibly set up to protect the revolution from reactionary forces, i.e., "class enemies" such as the bourgeoisie and members of the clergy, it soon became the repression tool against all political opponents of the communist regime. At the dir ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Felix Dzerzhinsky
Felix Edmundovich Dzerzhinsky ( pl, Feliks Dzierżyński ; russian: Фе́ликс Эдму́ндович Дзержи́нский; – 20 July 1926), nicknamed "Iron Felix", was a Bolshevik revolutionary and official, born into Poland, Polish nobility. From 1917 until his death in 1926, Dzerzhinsky led the first two Soviet National Security, state-security organizations, the Cheka and the OGPU, establishing a Chronology of Soviet secret police agencies, secret police for the Russian Revolution, post-revolutionary Sovnarkom, Soviet regime. He was one of the architects of the Red Terror and decossackization. Early life Felix Dzerzhinsky was born on 11 September 1877 to ethnically Poles, Polish parents of noble descent, at the Dzerzhinovo family estate, about from the small town of Ivyanets in the Minsk Governorate of the Russian Empire (now Belarus). In the Russian Empire, his family was of a type known as "Uradel, column-listed nobility" (russian: столбовое двор ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Europe
Europe is a large peninsula conventionally considered a continent in its own right because of its great physical size and the weight of its history and traditions. Europe is also considered a Continent#Subcontinents, subcontinent of Eurasia and it is located entirely in the Northern Hemisphere and mostly in the Eastern Hemisphere. Comprising the westernmost peninsulas of Eurasia, it shares the continental landmass of Afro-Eurasia with both Africa and Asia. It is bordered by the Arctic Ocean to the north, the Atlantic Ocean to the west, the Mediterranean Sea to the south and Asia to the east. Europe is commonly considered to be Boundaries between the continents of Earth#Asia and Europe, separated from Asia by the drainage divide, watershed of the Ural Mountains, the Ural (river), Ural River, the Caspian Sea, the Greater Caucasus, the Black Sea and the waterways of the Turkish Straits. "Europe" (pp. 68–69); "Asia" (pp. 90–91): "A commonly accepted division between Asia and E ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wilgott Theophil Odhner
Willgodt Theophil Odhner (in Cyrillic, Вильгодт Теофил Однер) was a Swedish engineer and entrepreneur, working in St. Petersburg, Russia. He was the inventor of the Odhner Arithmometer, which by the 1940s was one of the most popular type of portable mechanical calculator in the world.Trogemann G., Nitussov A.: ''Computing in Russia'', page 39-45, GWV-Vieweg, 2001, According to a brochure distributed by Odhner's company at the Paris World exposition of 1900 "...Odhner had, in 1871, an opportunity to repair a Thomas calculating machine and then became convinced that it is possible to solve the problem of mechanical calculation by a simpler and more appropriate way". It took him 19 years to perfect the design of this new machine so it could be manufactured effectively. Early years Odhner studied at the Royal Institute of Technology in Stockholm from 1864 to 1867 but left before graduating. At age 23, in 1868, he moved to Saint Petersburg, Russia, even though he ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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