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Jacob's Ladder (Saint Helena)
Jacob's Ladder is a Grade I listed staircase leading from Jamestown, Saint Helena, up the side of Ladder Hill to Ladder Hill Fort. The name is a reference to the biblical Jacob's Ladder, a ladder extending to heaven. The ladder is all that remains of a cable railway that was built there in the early 1800s. Its tracks and cars were later removed, although the stairs have remained in place and have become a tourist attraction connecting Jamestown and the suburb of Half Tree Hollow at the top of the hill. History and description Designed by the local engineer J. W. Hoar, the Saint Helena Railway Company built a two-car inclined plane, -long, in 1829 to carry cargo between Jamestown and the fort. The cars rode on a pair of iron-plated fir rails, laid on wooden sleepers anchored into the rock of the valley wall, that were separated by a staircase of 700 steps for pedestrians. The angle of ascent varied between 39 and 41 degrees. Motive power was provided by a team of three donke ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Funicular
A funicular ( ) is a type of cable railway system that connects points along a railway track laid on a steep grade (slope), slope. The system is characterized by two counterbalanced carriages (also called cars or trains) permanently attached to opposite ends of a haulage cable, which is looped over a pulley at the upper end of the track. The result of such a configuration is that the two carriages move synchronously: as one ascends, the other descends at an equal speed. This feature distinguishes funiculars from inclined elevators, which have a single car that is hauled uphill. The term ''funicular'' derives from the Latin word , the diminutive of , meaning 'rope'. Operation In a funicular, both cars are permanently connected to the opposite ends of the same cable, known as a ''haul rope''; this haul rope runs through a system of pulleys at the upper end of the line. If the railway track is not perfectly straight, the cable is guided along the track using sheaves – unpowered ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pulley
Sheave without a rope A pulley is a wheel on an axle or shaft enabling a taut cable or belt passing over the wheel to move and change direction, or transfer power between itself and a shaft. A pulley may have a groove or grooves between flanges around its circumference to locate the cable or belt. The drive element of a pulley system can be a rope, cable, belt, or chain. History The earliest evidence of pulleys dates back to Ancient Egypt in the Twelfth Dynasty (1991–1802 BC) and Mesopotamia in the early 2nd millennium BC. In Roman Egypt, Hero of Alexandria (c. 10–70 AD) identified the pulley as one of six simple machines used to lift weights. Pulleys are assembled to form a block and tackle in order to provide mechanical advantage to apply large forces. Pulleys are also assembled as part of belt and chain drives in order to transmit power from one rotating shaft to another. Plutarch's ''Parallel Lives'' recounts a scene where Archimedes proved the effectiveness ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stairways
Stairs are a structure designed to bridge a large vertical direction, vertical distance between lower and higher levels by dividing it into smaller vertical distances. This is achieved as a diagonal series of horizontal platforms called steps which enable passage to the other level by Walking, stepping from one to another step in turn. Steps are very typically rectangular. Stairs may be straight, curved, or may consist of two or more straight pieces connected at angles. Types of stairs include staircases (also called stairways) and escalators. Some alternatives to stairs are elevators (also called lifts), stairlifts, inclined moving walkways, ladders, and ramps. A stairwell is a vertical shaft or opening that contains a staircase. A flight (of stairs) is an inclined part of a staircase consisting of steps (and their lateral supports if supports are separate from steps). History ''This is an excerpt from Staircase.'' The concept of stairs is believed to be 8000 years old, and is ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Grade I Listed Buildings In Saint Helena
Grade most commonly refers to: * Grading in education, a measurement of a student's performance by educational assessment (e.g. A, pass, etc.) * A designation for students, classes and curricula indicating the number of the year a student has reached in a given educational stage (e.g. first grade, second grade, K–12, etc.) * Grade (slope), the steepness of a slope * Graded voting Grade or grading may also refer to: Music * Grade (music), a formally assessed level of profiency in a musical instrument * Grade (band), punk rock band * Grades (producer), British electronic dance music producer and DJ Science and technology Biology and medicine * Grading (tumors), a measure of the aggressiveness of a tumor in medicine * The Grading of Recommendations Assessment, Development and Evaluation (GRADE) approach * Evolutionary grade, a paraphyletic group of organisms Geology * Graded bedding, a description of the variation in grain size through a bed in a sedimentary rock * Metamorphic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rail Transport In Saint Helena, Ascension And Tristan Da Cunha
This article deals with traffic in Saint Helena, Ascension and Tristan da Cunha, that is all forms of traffic in the British overseas territory of Saint Helena, Ascension and Tristan da Cunha. Saint Helena Road traffic The island of Saint Helena has a road network, consisting of of paved and of unpaved road. Most roads are single-lane, and uphill traffic has a right of way. A general speed limit of applies to the entire island. On Saint Helena there is a public bus network that in January 2015 served five routes, but was expanded in September 2015, March 2016 and October 2017. Shipping The M/V ''Helena'' serves the island from Cape Town on a monthly basis. The ship was built in 1998 in China and can take of cargo, or 218 TEU. Saint Helena has a feeder and a harbour: * Jamestown (feeder) *Rupert's Wharf in the Rupert's Valley (harbour) Air traffic With the opening of Saint Helena Airport, scheduled flights have been operated since 14 October 2017, twelve years ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Transport In Saint Helena
This article deals with traffic in Saint Helena, Ascension Island, Ascension and Tristan da Cunha, that is all forms of traffic in the Saint Helena, Ascension and Tristan da Cunha, British overseas territory of Saint Helena, Ascension and Tristan da Cunha. Saint Helena Road traffic The island of Saint Helena has a road network, consisting of of paved and of unpaved road. Most roads are single-lane, and uphill traffic has a right of way. A general speed limit of applies to the entire island. On Saint Helena there is a public bus network that in January 2015 served five routes, but was expanded in September 2015, March 2016 and October 2017. Shipping The M/V ''Helena'' serves the island from Cape Town on a monthly basis. The ship was built in 1998 in China and can take of cargo, or 218 Twenty-foot equivalent unit, TEU. Saint Helena has a feeder and a harbour: *Jamestown, Saint Helena, Jamestown (feeder) *Rupert's Wharf in the Rupert's Valley (harbour) Air traffic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Transport On Saint Helena
This article deals with traffic in Saint Helena, Ascension and Tristan da Cunha, that is all forms of traffic in the British overseas territory of Saint Helena, Ascension and Tristan da Cunha. Saint Helena Road traffic The island of Saint Helena has a road network, consisting of of paved and of unpaved road. Most roads are single-lane, and uphill traffic has a right of way. A general speed limit of applies to the entire island. On Saint Helena there is a public bus network that in January 2015 served five routes, but was expanded in September 2015, March 2016 and October 2017. Shipping The M/V ''Helena'' serves the island from Cape Town on a monthly basis. The ship was built in 1998 in China and can take of cargo, or 218 TEU. Saint Helena has a feeder and a harbour: * Jamestown (feeder) *Rupert's Wharf in the Rupert's Valley (harbour) Air traffic With the opening of Saint Helena Airport, scheduled flights have been operated since 14 October 2017, twelve year ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Funicular Railways
This is a list of funicular railways, organised by place within country and continent. The funiculars range from short urban lines to significant multi-section mountain railways. A funicular railway is distinguished from the similar incline elevator in that it has two vehicles that counterbalance one another rather than independently operated cars. Africa Réunion Saint Helena South Africa Americas Brazil Canada Chile Colombia Mexico Puerto Rico United States Asia Azerbaijan China Hong Kong India Israel Japan Lebanon Malaysia North Korea Philippines South Korea Russia ''(Russia is a transcontinental country spanning Europe and Asia. All the funicular railways below are on the East Asian side so are listed here.)'' (See: List of funicular railways#Russia, Europe/Russia section) Thailand Turkey Turkey is in both Europe and Asia. The border between the two continents is the Bosphorus Stra ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Royal Engineers
The Corps of Royal Engineers, usually called the Royal Engineers (RE), and commonly known as the ''Sappers'', is the engineering arm of the British Army. It provides military engineering and other technical support to the British Armed Forces and is headed by the Chief Royal Engineer. The Corps Headquarters and the Royal School of Military Engineering are in Chatham, Kent, Chatham in Kent, England. The corps is divided into several regiments, barracked at various places in the United Kingdom and around the world. History The Royal Engineers trace their origins back to the military engineers brought to England by William the Conqueror, specifically Gundulf of Rochester, Bishop Gundulf of Rochester Cathedral, and claim over 900 years of unbroken service to the crown. Engineers have always served in the armies of the Crown; however, the origins of the modern corps, along with those of the Royal Artillery, lie in the Board of Ordnance established in the 15th century. In Woolwich ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Termite
Termites are a group of detritivore, detritophagous Eusociality, eusocial cockroaches which consume a variety of Detritus, decaying plant material, generally in the form of wood, Plant litter, leaf litter, and Humus, soil humus. They are distinguished by their moniliform antennae and the soft-bodied, unpigmented worker caste for which they have been commonly termed "white ants"; however, they are not ants but highly Apomorphy and synapomorphy, derived cockroaches. About 2,997 extant species are currently described, 2,125 of which are members of the family Termitidae. Termites comprise the infraorder Isoptera, or alternatively the Taxonomic rank#All ranks, epifamily Termitoidae, within the order Blattodea (the cockroaches). Termites were once classified in a separate Order (biology), order from cockroaches, but recent phylogenetic studies indicate that they evolved from cockroaches, as they are deeply nested within the group, and the sister group to wood-eating cockroaches of t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Capstan (nautical)
A capstan is a vertical-axled rotating machine developed for use on sailing ships to multiply the pulling force of sailors when hauling ropes, Nautical cable, cables, and hawsers. The principle is similar to that of the windlass, which has a horizontal axle. History The word, connected with the Old French or , from Old Provençal , from "pulley cord", from Latin , a halter, from , to take hold of, seems to have come into English (14th century) from Portuguese or Spanish shipmen at the time of the Crusades. Both device and word are considered Spanish inventions. Early form In its earliest form, the capstan consisted of a timber mounted vertically through a vessel's structure which was free to rotate. Levers, known as bars, were inserted through holes at the top of the timber and used to turn the capstan. A rope wrapped several turns around the drum was thus hauled upon. A rudimentary ratchet (device), ratchet was provided to hold the tension. The ropes were always wound i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jamestown, Saint Helena
Jamestown is the capital city of the British Overseas Territories, British Overseas Territory of Saint Helena, Ascension and Tristan da Cunha, located on the island of Saint Helena in the South Atlantic Ocean. It is also the historic main settlement of the island and is on its north-western coast. Before the development of the port at Rupert's Bay, it was the island's only port and the centre of the island's road and communications network. It was founded when colonists from the English East India Company settled on the island in 1659 and was briefly occupied by the Dutch East India Company in 1673 before being recaptured. Many of the buildings built by the East India Company in the 18th century survive and give the town its distinctive Georgian architecture, Georgian flavour. The city briefly hosted Napoleon in 1815 during his exile on St. Helena and later served as a base for the Royal Navy's efforts to suppress the History of slavery, slave trade. It had no role during the F ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
