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Clockwork
Clockwork refers to the inner workings of either mechanical devices called clocks and watches (where it is also called the movement) or other mechanisms that work similarly, using a series of gears driven by a spring or weight. A clockwork mechanism is often powered by a clockwork motor, description of the clockwork motor in an antique phonograph consisting of a mainspring, a spiral torsion spring of metal ribbon. Energy is stored in the mainspring manually by ''winding it up'', turning a key attached to a ratchet which twists the mainspring tighter. Then the force of the mainspring turns the clockwork gears, until the stored energy is used up. The adjectives ''wind-up'' and ''spring-powered'' refer to mainspring-powered clockwork devices, which include clocks and watches, kitchen timers, music boxes, and wind-up toys. History The earliest known example of a clockwork mechanism is the Antikythera mechanism, a first-century BC geared analogue computer, somewhat astrolabe-li ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Movement (clockwork)
In horology, a movement, also known as a caliber or calibre (British English), is the mechanism of a watch or Clock, timepiece, as opposed to the ''case'', which encloses and protects the movement, and the ''clock face, face'', which displays the time. The term originated with mechanical timepieces, whose clockwork movements are made of many moving parts. The movement of a digital watch is more commonly known as a module. In modern mass-produced clocks and watches, the same movement is often inserted into many different styles of case. When buying a quality pocketwatch from the mid-19th to the mid-20th century, for example, the customer would select a movement and case individually. Mechanical movements get dirty and the lubricants dry up, so they must periodically be disassembled, cleaned, and lubricated. One source recommends servicing intervals of: 3–5 years for watches, 15–20 years for grandfather clocks, 10–15 years for wall or mantel clocks, 15–20 years for anniv ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Music Box
A music box (American English) or musical box (British English) is an automatic musical instrument in a box that produces musical notes by using a set of pins placed on a revolving cylinder or disc to pluck the tuned teeth (or ''lamellae'') of a steel comb. The popular device best known today as a "music box" developed from musical snuff boxes of the 18th century and were originally called ''carillons à musique'' (French for "chimes of music"). Some of the more complex boxes also contain a tiny drum and/or bells in addition to the metal comb. History The Symphonium company started business in 1885 as the first manufacturers of disc-playing music boxes. Two of the founders of the company, Gustave Brachhausen and Paul Riessner, left to set up a new firm, Polyphon, in direct competition with their original business and their third partner, Oscar Paul Lochmann. Following the establishment of the Original Musikwerke Paul Lochmann in 1900, the founding Symphonion business contin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gear
A gear is a rotating circular machine part having cut teeth or, in the case of a cogwheel or gearwheel, inserted teeth (called ''cogs''), which mesh with another (compatible) toothed part to transmit (convert) torque and speed. The basic principle behind the operation of gears is analogous to the basic principle of levers. A gear may also be known informally as a cog. Geared devices can change the speed, torque, and direction of a power source. Gears of different sizes produce a change in torque, creating a mechanical advantage, through their ''gear ratio'', and thus may be considered a simple machine. The rotational speeds, and the torques, of two meshing gears differ in proportion to their diameters. The teeth on the two meshing gears all have the same shape. Two or more meshing gears, working in a sequence, are called a gear train or a '' transmission''. The gears in a transmission are analogous to the wheels in a crossed, belt pulley system. An advantage of gears is tha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Prim Clockwork
Prim may refer to: People * Prim (given name) * Prim (surname) Places * Prim, Virginia, unincorporated community in King George County *Dolní Přím, village in the Czech Republic; as Nieder Prim (Lower Prim) site of the Battle of Königgrätz * Saint-Prim, commune in Isère, France *Prim (Neckar), river in Baden-Württemberg, Germany, tributary of the Neckar *Prims, river in Rhineland-Palatinate, Germany, tributary of the Saar Other *Prim, a type of ''tamburica'' (musical instrument) *Prim or Primost, a Norwegian cheese *Prim, abbreviation for Primitive Methodist *Prim's algorithm for minimum spanning tree, developed by Robert C. Prim *PRIM (watches), a Czech trademark *Graham Street Prims F.C., football club in Derby, England * In computers, a geometric primitive, or prim, is a simple shape used in 3D modeling to build into more complex objects. ** A Sculpted prim, in Second Life, is a 3D parametric object whose 3D shape is determined by a texture, more advanced than the game ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Torah
The Torah (; hbo, ''Tōrā'', "Instruction", "Teaching" or "Law") is the compilation of the first five books of the Hebrew Bible, namely the books of Genesis, Exodus, Leviticus, Numbers and Deuteronomy. In that sense, Torah means the same as Pentateuch or the Five Books of Moses. It is also known in the Jewish tradition as the Written Torah (, ). If meant for liturgic purposes, it takes the form of a Torah scroll ('' Sefer Torah''). If in bound book form, it is called ''Chumash'', and is usually printed with the rabbinic commentaries (). At times, however, the word ''Torah'' can also be used as a synonym for the whole of the Hebrew Bible or Tanakh, in which sense it includes not only the first five, but all 24 books of the Hebrew Bible. Finally, Torah can even mean the totality of Jewish teaching, culture, and practice, whether derived from biblical texts or later rabbinic writings. The latter is often known as the Oral Torah. Representing the core of the Jewish spiri ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
History Of China
The earliest known written records of the history of China date from as early as 1250 BC, from the Shang dynasty (c. 1600–1046 BC), during the reign of king Wu Ding. Ancient historical texts such as the '' Book of Documents'' (early chapters, 11th century BC), the '' Bamboo Annals'' (c. 296 BC) and the ''Records of the Grand Historian'' (c. 91 BC) describe a Xia dynasty before the Shang, but no writing is known from the period, and Shang writings do not indicate the existence of the Xia. The Shang ruled in the Yellow River valley, which is commonly held to be the cradle of Chinese civilization. However, Neolithic civilizations originated at various cultural centers along both the Yellow River and Yangtze River. These Yellow River and Yangtze civilizations arose millennia before the Shang. With thousands of years of continuous history, China is among the world's oldest civilizations and is regarded as one of the cradles of civilization. The Zhou dynasty (1046–256 BC) supp ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lie Zi
The ''Liezi'' () is a Taoist text attributed to Lie Yukou, a c. 5th century BC Hundred Schools of Thought philosopher. Although there were references to Lie's ''Liezi'' from the 3rd and 2nd centuries BC, a number of Chinese and Western scholars believe that the content of the current text was compiled around the 4th century CE by Zhang Zhan. Textual history The first two references to the ''Liezi'' book are from the Former Han Dynasty. The editor Liu Xiang notes he eliminated repetitions in ''Liezi'' and rearranged it into eight chapters (''pian'' ). The Book of Han bibliography section () says it has eight chapters () and concludes that since the ''Zhuangzi'' quotes Liezi, he must have lived before Zhuangzi. There is a three-century historical gap until the next evidence of the ''Liezi'': the Jin dynasty commentary by Zhang Zhan (fl. ca. 370 CE). Zhang's preface claims his ''Liezi'' copy was transmitted down from his grandfather. All received ''Liezi'' texts derive from Zha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
King Mu Of Zhou
King Mu of Zhou (), personal name Ji Man, was the fifth king of the Zhou dynasty of China. The dates of his reign are 976–922 BC or 956–918 BC. Life King Mu came to the throne after his father King Zhao’s death during his tour to the South. King Mu was perhaps the most pivotal king of the Zhou dynasty, reigning nearly 55 years, from ca. 976 BC to ca. 922 BC. Mu was more ambitious than wise, yet he was able to introduce reforms that changed the nature of the Zhou government, transforming it from a hereditary system to one that was based on merit and knowledge of administrative skills. During Mu’s reign, the Zhou Dynasty was at its peak, and Mu tried to stamp out invaders in the western part of China and ultimately expand Zhou’s influence to the east. In the height of his passion for conquests, he led an immense army against the Quanrong, who inhabited the western part of China. His travels allowed him to contact many tribes and swayed them to either join under the Zhou ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aulus Gellius
Aulus Gellius (c. 125after 180 AD) was a Roman author and grammarian, who was probably born and certainly brought up in Rome. He was educated in Athens, after which he returned to Rome. He is famous for his ''Attic Nights'', a commonplace book, or compilation of notes on grammar, philosophy, history, antiquarianism, and other subjects, preserving fragments of the works of many authors who might otherwise be unknown today. Name Medieval manuscripts of the ''Noctes Atticae'' commonly gave the author's name in the form of "Agellius", which is used by Priscian; Lactantius, Servius and Saint Augustine had "A. Gellius" instead. Scholars from the Renaissance onwards hotly debated which one of the two transmitted names is correct (the other one being presumably a corruption) before settling on the latter of the two in modern times. Life The only source for the life of Aulus Gellius is the details recorded in his writings. Internal evidence points to Gellius having been born between AD ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Archytas
Archytas (; el, Ἀρχύτας; 435/410–360/350 BC) was an Ancient Greek philosopher, mathematician, music theorist, astronomer, statesman, and strategist. He was a scientist of the Pythagorean school and famous for being the reputed founder of mathematical mechanics, as well as a good friend of Plato. Life and work Archytas was born in Tarentum, Magna Graecia and was the son of Mnesagoras or Hadees. For a while, he was taught by Philolaus, and was a teacher of mathematics to Eudoxus of Cnidus. Archytas and Eudoxus' student was Menaechmus. As a Pythagorean, Archytas believed that only arithmetic, not geometry, could provide a basis for satisfactory proofs. Archytas is believed to be the founder of mathematical mechanics.: ''Vitae philosophorum'' As only described in the writings of Aulus Gellius five centuries after him, he was reputed to have designed and built the first artificial, self-propelled flying device, a bird-shaped model propelled by a jet of what was probably st ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Judaism
Judaism ( he, ''Yahăḏūṯ'') is an Abrahamic, monotheistic, and ethnic religion comprising the collective religious, cultural, and legal tradition and civilization of the Jewish people. It has its roots as an organized religion in the Middle East during the Bronze Age. Modern Judaism evolved from Yahwism, the religion of ancient Israel and Judah, by the late 6th century BCE, and is thus considered to be one of the oldest monotheistic religions. Judaism is considered by religious Jews to be the expression of the covenant that God established with the Israelites, their ancestors. It encompasses a wide body of texts, practices, theological positions, and forms of organization. The Torah, as it is commonly understood by Jews, is part of the larger text known as the ''Tanakh''. The ''Tanakh'' is also known to secular scholars of religion as the Hebrew Bible, and to Christians as the " Old Testament". The Torah's supplemental oral tradition is represented by later texts s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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