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Jackhammer
A jackhammer (pneumatic drill or demolition hammer in British English) is a pneumatic or electro-mechanical tool that combines a hammer directly with a chisel. It was invented by William McReavy, who then sold the patent to Charles Brady King. Hand-held jackhammers are generally powered by compressed air, but some are also powered by electric motors. Larger jackhammers, such as rig-mounted hammers used on construction machinery, are usually hydraulically powered. These tools are typically used to break up rock, pavement, and concrete. A jackhammer operates by driving an ''internal'' hammer up and down. The hammer is first driven down to strike the chisel and then back up to return the hammer to the original position to repeat the cycle. The effectiveness of the jackhammer is dependent on how much force is applied to the tool. It is generally used like a hammer to break the hard surface or rock in construction works and it is not considered under earth-moving equipment, al ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pneumatic Tool
A pneumatic tool, air tool, air-powered tool or pneumatic-powered tool is a type of power tool, driven by compressed air supplied by an air compressor. Pneumatic tools can also be driven by compressed carbon dioxide () stored in small cylinders allowing for portability. Most pneumatic tools convert the compressed air to work using a pneumatic motor. Compared to electric power tool equivalents, pneumatic tools are safer to run and maintain, without risk of sparks, short-circuiting or electrocution, and have a higher power to weight ratio, allowing a smaller, lighter tool to accomplish the same task. Furthermore, they are less likely to self-destruct in case the tool is jammed or overloaded. General grade pneumatic tools with a short life span are commonly less expensive and considered “disposable tools” in tooling industries, while industrial grade pneumatic tools with long life span are more expensive. In general, pneumatic tools are cheaper than the equivalent electric-power ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hammer
A hammer is a tool, most often a hand tool, consisting of a weighted "head" fixed to a long handle that is swung to deliver an impact to a small area of an object. This can be, for example, to drive nail (fastener), nails into wood, to shape metal (as with a forge), or to crush Rock (geology), rock. Hammers are used for a wide range of driving, shaping, breaking and non-destructive striking applications. Traditional disciplines include carpentry, blacksmithing, war hammer, warfare, and mallet percussion, percussive musicianship (as with a gong). Hammering is use of a hammer in its strike capacity, as opposed to pry bar, prying with a secondary claw or grappling with a secondary hook. Carpentry and blacksmithing hammers are generally wielded from a stationary stance against a stationary target as gripped and propelled with one arm, in a lengthy downward plane (geometry), planar arc—downward to add kinetic energy to the impact—pivoting mainly around the shoulder and elbo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chisel
A chisel is a hand tool with a characteristic Wedge, wedge-shaped cutting edge on the end of its blade. A chisel is useful for carving or cutting a hard material such as woodworking, wood, lapidary, stone, or metalworking, metal. Using a chisel involves forcing the blade into some material to cut it. The driving force may be applied by pushing by hand, or by using a mallet or hammer. In industrial use, a hydraulic ram or falling weight ('trip hammer') may be used to drive a chisel into the material. A Chisel#Gouge, gouge is a type of chisel that serves to carve small pieces from the material; particularly in woodworking, woodturning and sculpture. Woodworking Woodworking chisels range from small hand tools for tiny details, to large chisels used to remove big sections of wood, in 'roughing out' the shape of a pattern or design. Typically, in Wood carving, woodcarving, one starts with a larger tool, and gradually progresses to smaller tools to finish the detail. One of t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kingdom Of Sardinia
The Kingdom of Sardinia, also referred to as the Kingdom of Sardinia and Corsica among other names, was a State (polity), country in Southern Europe from the late 13th until the mid-19th century, and from 1297 to 1768 for the Corsican part of this kingdom. The kingdom was a member of the Council of Aragon and initially consisted of the islands of Corsica and Sardinia, sovereignty over both of which was claimed by the papacy, which granted them as a fief, the (Kingdom of Sardinia and Corsica), to King James II of Aragon in 1297. Beginning in 1324, James and his successors Aragonese conquest of Sardinia, conquered the island of Sardinia and established ''de facto'' their ''de jure'' authority. In 1420, after the Sardinian–Aragonese war, the last competing claim to the island was bought out. After the union of the crowns of Aragon and Crown of Castile, Castile, Sardinia became a part of the burgeoning Spanish Empire. In 1720, the island and its kingdom were ceded by the House o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Charles Albert Of Sardinia
Charles Albert (; 2 October 1798 – 28 July 1849) was the Kingdom of Sardinia (1720–1861), King of Sardinia and ruler of the Savoyard state from 27 April 1831 until his abdication in 1849. His name is bound up with the first Italian constitution, the ''Statuto Albertino'', and with the First Italian War of Independence (1848–1849). During the Napoleonic period, Charles Albert resided in French First Republic, France, where he received a liberal education. As Prince of Carignano in 1821, he granted and then withdrew his support for a rebellion which sought to force Victor Emmanuel I to institute a constitutional monarchy. He became a conservative and participated in the legitimist expedition against the Spanish liberals in 1823 known as the "Hundred Thousand Sons of Saint Louis". Charles Albert became king of Sardinia in 1831 on the death of his distant cousin Charles Felix of Sardinia, Charles Felix, who had no heir. As king, after an initial conservative period during wh ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fréjus Rail Tunnel
The Fréjus Rail Tunnel (also called Mont Cenis Tunnel) is a rail tunnel of length in the European Alps, carrying the Turin–Modane railway through Mont Cenis to an end-on connection with the Culoz–Modane railway and linking Bardonecchia in Italy to Modane in France. Its mean altitude is and it passes beneath the '' Pointe du Fréjus'' () and the '' Col du Fréjus'' (). Headed by the Savoyard civil engineer Germain Sommeiller, construction of the tunnel commenced during August 1857, at a time when both ends of the future tunnel were in the Kingdom of Sardinia. From the onset, the tunnel was an ambitious engineering challenge, its gallery being twice the length of any tunnel previously constructed. Some figures believed that it would take as many as 40 years to complete; the total construction time was 13 years, the work having been greatly accelerated by the introduction of new technologies such as pneumatic drilling machines and dynamite. On 17 September 1871, the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
François Cavé
François () is a French masculine given name and surname, equivalent to the English name Francis. People with the given name * François Amoudruz (1926–2020), French resistance fighter * François-Marie Arouet (better known as Voltaire; 1694–1778), French Enlightenment writer, historian, and philosopher * François Beauchemin (born 1980), Canadian ice hockey player for the Anaheim Ducks * François Blanc (1806–1877), French entrepreneur and operator of casinos * François Bonlieu (1937–1973), French alpine skier * François Cevert (1944–1973), French racing driver * François Chau (born 1959), Cambodian American actor * François Clemmons (born 1945), American singer and actor * François Corbier (1944–2018), French television presenter and songwriter * François Coty (1874–1934), French perfumer * François Coulomb the Elder (1654–1717), French naval architect * François Coulomb the Younger (1691–1751), French naval architect * François Couperin (1668–1 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gotthard Tunnel
The Gotthard Tunnel (, ) is a railway tunnel that forms the summit of the Gotthard Railway in Switzerland. It connects Göschenen with Airolo and was the first tunnel through the Saint-Gotthard Massif in order to bypass the St Gotthard Pass. It was built as single bore tunnel accommodating a standard gauge double-track railway throughout. When opened in 1882, the Gotthard Tunnel was the longest tunnel in the world. The tunnel rises from the northern portal at Göschenen () and the highest point () is reached after approximately . After two more kilometers, the border between the cantons of Uri and Ticino is passed; after another , the tunnel ends at the southern portal near to Airolo (). The trip takes about seven to eight minutes by train. Services are operated by the Swiss Federal Railways. History Background The origins of the Gotthard Tunnel and its construction can be traced back to the widely-felt desire to improve interconnectivity between the European nation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Savoy
Savoy (; ) is a cultural-historical region in the Western Alps. Situated on the cultural boundary between Occitania and Piedmont, the area extends from Lake Geneva in the north to the Dauphiné in the south and west and to the Aosta Valley in the east. Savoy, formerly a part of the Kingdom of Burgundy, emerged as the feudal County of Savoy ruled by the House of Savoy during the 11th to 14th centuries. The original territory, also known as "ducal Savoy" or "Savoy proper", is largely co-terminous with the modern French Savoie and Haute-Savoie ''départements'' in the region of Rhône-Alpes, but the historical expansion of Savoyard territories, as the Duchy of Savoy (1416–1860), included parts of what is now western Italy and southwestern Switzerland. The current border between France and Italy is due to the Plombières Agreement of 1858, which in preparation for the unification of Italy ceded western Savoy to France, while the eastern territories in Piedmont an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Germain Sommeiller
Germain Sommeiller (February 15, 1815, in Saint-Jeoire – July 11, 1871) was an Italian civil engineer from Savoy. He directed the construction of the Fréjus Rail Tunnel between France and Italy, also known as the Mont Cenis Tunnel. This was the first of a series of major tunnels built in the late 19th century to connect northern and southern Europe through the Alps. Sommeiller pioneered the use of pneumatic drilling and dynamite to achieve record-breaking excavation speeds. This 13.7km tunnel was completed on 26 December 1870, 11 years ahead of schedule. It remained the longest tunnel in the world until the opening of the Gotthard Rail Tunnel in 1882. Life Germain Sommeiller was born in Saint-Jeoire (now part of Haute-Savoie, France) on 15 February 1815. He graduated in civil engineering at the University of Turin in 1841. He became a Royal Civil Engineer in the Public Transport Department of Savoy in 1845. From 1846 to 1850 he worked for the Cockerill steel company in L ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
