Revista de Historia Antigua. Each type has its own tone and volume, from the soft honks of crowned cranes to the flutelike call of Siberian cranes. Pairs that are repeatedly successful at breeding remain together for as long as they continue to do so. During the High Middle Ages , the treadwheel crane was reintroduced on a large scale after the technology had fallen into disuse in western Europe with the demise of the Western Roman Empire. Since these holes point at the use of a lifting device, and since they are to be found either above the center of gravity of the block, or in pairs equidistant from a point over the center of gravity, they are regarded by archaeologists as the positive evidence required for the existence of the crane. ISBN Retrieved 3 June A telescopic crane has a boom that consists of a number of tubes fitted one inside the other. Regal symbols. Ibycus called to a flock of passing cranes, which followed the attacker to a theater and hovered over him until, stricken with guilt, he confessed to the crime. Cranes can mount many different fittings, such as hooks, blocks , spreader bars, and "choker" lines, depending on load left. These white species are also generally larger.
Matheus , p. The smaller size and colour of the forest species is thought to help them maintain a less conspicuous profile while nesting; two of these species the common and sandhill cranes also daub their feathers with mud which some observers suspect helps them to hide while nesting. In , the industrialist and businessman William Armstrong designed a water-powered hydraulic crane. Word lists shared by our community of dictionary fans. Supplier and Customer Documents. Pick and carry cranes are popular in Australia, where large distances are encountered between job sites. The device uses one or more simple machines , such as the lever and pulley , to create mechanical advantage to do its work. ISSN X.
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Wattled crane G. See also: List of cranes. Retrieved 8 June The call of a whooping crane can often be heard from a mile away. When a tower crane is used in proximity to buildings, roads, power lines, or other tower cranes, a tower crane anti-collision system is used. Language school. Walter — English artist. An photo of a 15th-century crane on the unfinished south tower of Cologne Cathedral. At every step of the manufacturing process, until it leaves a factory as a finished product, steel is handled by an overhead crane. There are many types of tower cranes. Crane vessels are often used in offshore construction. Gopi; Grant, John D. The two treadwheels whose diameter is estimated to be 4 m or larger were attached to each side of the axle and rotated together. Main article: Straddle carrier.
Crane (bird) - Wikipedia
- A specialty example of a climbing Crane was introduced by Lagerwey Wind and Enercon [ This paragraph needs citation s ] to construct a wind turbine tower, where instead of erecting a large crane Crane smaller climbing crane can raise itself with the structure's construction, lift the generator housing to its top, Crane, add the rotor blades, then climb down.
- The crane was sold to the Panama Crane in where it is now known as Titan.
- Exchanging mobility for the ability to carry greater loads and reach greater heights due to increased stability, these types of cranes are characterised by Crane fact that their main structure does not move during the period of use, Crane.
- Around the same time, Crane, block sizes at Greek temples Crane to match their archaic predecessors again, indicating that the more sophisticated compound pulley must have found its way to Greek construction sites by then.
A crane is a machine used to move materials both vertically and horizontally, utilizing a system of a boom , hoist , wire ropes or chains , and sheaves used for lifting and relocating heavy objects, typically within the swing of its boom. The device uses one or more simple machines , such as the lever and pulley , to create mechanical advantage to do its work. Cranes are commonly employed in transportation for the loading and unloading of freight, in construction for the movement of materials, and in manufacturing for the assembling of heavy equipment. The first known crane machine was the shaduf , a water-lifting device that was invented in ancient Mesopotamia modern Iraq and then appeared in ancient Egyptian technology. Construction cranes later appeared in ancient Greece , where they were powered by men or animals such as donkeys , and used for the construction of buildings. Larger cranes were later developed in the Roman Empire , employing the use of human treadwheels , permitting the lifting of heavier weights. In the High Middle Ages , harbour cranes were introduced to load and unload ships and assist with their construction—some were built into stone towers for extra strength and stability. The earliest cranes were constructed from wood, but cast iron , iron and steel took over with the coming of the Industrial Revolution. For many centuries, power was supplied by the physical exertion of men or animals, although hoists in watermills and windmills could be driven by the harnessed natural power. The first mechanical power was provided by steam engines , the earliest steam crane being introduced in the 18th or 19th century, with many remaining in use well into the late 20th century. There are many different types of cranes, each tailored to a specific use. Sizes range from the smallest jib cranes, used inside workshops, to the tallest tower cranes, used for constructing high buildings. Mini-cranes are also used for constructing high buildings, to facilitate constructions by reaching tight spaces. Large floating cranes are generally used to build oil rigs and salvage sunken ships. Some lifting machines do not strictly fit the above definition of a crane, but are generally known as cranes, such as stacker cranes and loader cranes. Cranes were so called from the resemblance to the long neck of the bird , cf.
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Crane. Species Field Guide
These examples are programmatically compiled from various online sources to illustrate current usage of the word 'crane. Send us feedback about these Crane. Accessed 27 Feb. Crane 1 of 3 biographical name 1 ˈkrān Harold Hart — American poet Crane. Nglish: Translation of crane for Spanish Speakers, Crane. Britannica English: Translation of crane for Arabic Speakers. Subscribe to America's largest dictionary and Crane thousands more definitions and advanced search—ad free! See Definitions and Examples ». Dictionary Definition, Crane. Log In. Synonyms of crane.
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Regal symbols. From their powerful calls to their intricate dances, cranes have enchanted people for centuries. These birds fly through Indigenous North American tribe legends, and Australian and European folklore, and some are considered sacred in Asia. Fifteen crane species range across five continents, with migratory cranes circumnavigating scorching deserts, mountain ranges, and frozen tundra.
Meanwhile, some of the smaller demoiselle cranes navigate through the Crane of the Himalayas in their migration, Crane, while others fly across the vast deserts of the Middle East and northern Africa.
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