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Trevor Wadley
Trevor Lloyd Wadley, (1920 – 21 May 1981) was a South African electrical engineer, best known for his development of the Wadley Loop circuit for greater stability in communications receivers and the Tellurometer, a land surveying device. Life and career Wadley was born in 1920 in Durban, South Africa. His father was the Mayor of Durban and Trevor was one of 12 children. He attended Durban High School where he excelled in mathematics and science but was uninterested in any sport. The exception was one year when he entered the annual cross-country athletics event and predicted that he would win in record time and his record would stand for 15 years. He went on to do exactly as he had predicted. His training method involved calculating the time he needed to run each section of the course and then training himself to run at the required pace for each section. He then went to Howard College (now the University of KwaZulu-Natal), where he studied under Hugh Clark and Eric Phillips ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Durban
Durban ( ; , from meaning "bay, lagoon") is the third-most populous city in South Africa, after Johannesburg and Cape Town, and the largest city in the Provinces of South Africa, province of KwaZulu-Natal. Situated on the east coast of South Africa, on the Natal Bay of the Indian Ocean, Durban is the Port of Durban, busiest port city in sub-Saharan Africa and was formerly named Port Natal. North of the harbour and city centre lies the mouth of the Umgeni River; the flat city centre rises to the hills of the Berea, Durban, Berea on the west; and to the south, running along the coast, is the Bluff, KwaZulu-Natal, Bluff. Durban is the seat of the larger eThekwini Metropolitan Municipality, which spans an area of and had a population of 4.2million in 2022 South African census, 2022, making the metropolitan population one of Africa's largest on the Indian Ocean. Within the city limits, Durban's population was 595,061 in 2011 South African census, 2011. The city has a humid subtr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
University Of The Witwatersrand
The University of the Witwatersrand, Johannesburg (), commonly known as Wits University or Wits, is a multi-campus Public university, public research university situated in the northern areas of central Johannesburg, South Africa. The university has its roots in the mining industry, as do Johannesburg and the Witwatersrand in general. Founded in 1896 as the South African School of Mines in Kimberley, South Africa, Kimberley, it is the third oldest South African university in continuous operation. The university has an enrollment of 37,295 students as of 2025, of which approximately 20 percent live on campus in the university's 17 residences. 63 percent of the university's total enrollment is for Undergraduate education, undergraduate study, with 35 percent being Postgraduate education, postgraduate and the remaining 2 percent being Occasional Students. The university has, as of 2024, an acceptance rate of approximately 4.5%, having received 140,000 applications but only having a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Plumstead, Cape Town
Plumstead is a residential suburb situated in the Southern Suburbs region of Cape Town, in the Western Cape province of South Africa. History Plumstead was first mentioned when, in 1762, a large portion of the land beyond the Constantia Valley was granted to the free burghers Hendrick Jergens and Johan Barrens, who were Dutch settlers. They called the land ''Rust en Werk'' (Dutch for ''Rest and Work''). Twenty years later the land was granted to Hendrick Bouman Brigeraad. After the decline of the Dutch East India Company, the British occupied the Cape. Henry Batt, a Brit, arrived in 1807, bought Rust and Werk, and renamed it Plumstead, after a district of London with the same name. He farmed the area for twenty six years, and died in 1833. The farm Plumstead was sub-divided and bought by Messrs. Higgs, Loubscher and Southey. Today, Plumstead consists of a mix of houses built in the 1940s and 1950s and more modern residences. Geography The suburb is bordered to the east by ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Salisbury Plain
Salisbury Plain is a chalk plateau in southern England covering . It is part of a system of chalk downlands throughout eastern and southern England formed by the rocks of the Chalk Group and largely lies within the county of Wiltshire, but stretches into Hampshire. The plain is famous for its rich archaeology, including Stonehenge, one of England's best known landmarks. Large areas are given over to military training; thus, the sparsely populated plain is the biggest remaining area of calcareous grassland in northwest Europe. Additionally, the plain has arable land, and a few small areas of beech trees and coniferous woodland. Its highest point is Easton Hill. A large amount of land is set aside for military use as Salisbury Plain Training Area. Physical geography The boundaries of Salisbury Plain have never been truly defined, and there is some difference of opinion as to its exact area. The river valleys surrounding it, and other downland, downs and plains beyond them loo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Harold Macmillan
Maurice Harold Macmillan, 1st Earl of Stockton (10 February 1894 – 29 December 1986), was a British statesman and Conservative Party (UK), Conservative politician who was Prime Minister of the United Kingdom from 1957 to 1963. Nicknamed "Supermac (cartoon), Supermac", he was known for his pragmatism, wit, and wiktionary:unflappability, unflappability. Macmillan was seriously injured as an infantry officer during the First World War. He suffered pain and partial immobility for the rest of his life. After the war he joined Macmillan Publishers, his family book-publishing business, then entered Parliament at the 1924 United Kingdom general election, 1924 general election for Stockton-on-Tees (UK Parliament constituency), Stockton-on-Tees. Losing his seat in 1929, he regained it in 1931, soon after which he spoke out against the high rate of unemployment in Stockton. He opposed the appeasement of Germany practised by the Conservative government. He rose to high office du ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Teddington
Teddington is an affluent suburb of London in the London Borough of Richmond upon Thames. Historically an Civil parish#ancient parishes, ancient parish in the county of Middlesex and situated close to the border with Surrey, the district became part of Greater London in 1965. In 2021, ''The Sunday Times'' named Teddington as the best place to live in London, and in 2023, the wider borough was ranked first in Rightmove's ''Happy at Home'' index, making it the "happiest place to live in Great Britain"; the first time a London borough has taken the top spot. Teddington is situated on a long meandering of the Thames between Hampton Wick and Strawberry Hill, London, Strawberry Hill, Twickenham. Mostly residential, it stretches from the river to Bushy Park with the commercial focus on the A313 road. At Teddington's centre is the High Street and Broad Street, alongside mid-rise urban developments, containing offices and apartments. There is a suspension bridge over the lowest non-tidal ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
National Physical Laboratory (United Kingdom)
The National Physical Laboratory (NPL) is the national measurement standards laboratory of the United Kingdom. It sets and maintains physical standards for British industry. Founded in 1900, the NPL is one of the oldest metrology institutes in the world. Research and development work at the laboratory has contributed to the advancement of many disciplines of science, including the development of early computers in the late 1940s and 1950s, construction of the first accurate atomic clock in 1955, and the invention and first implementation of packet switching in the 1960s, which is today one of the fundamental technologies of the Internet. The former heads of NPL include many individuals who were pillars of the British scientific establishment. NPL is based at Bushy Park in Teddington, southwest London. It is operated by NPL Management Ltd, a company owned by the Department for Science, Innovation and Technology, and is one of the most extensive government laboratories in the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Baseline (surveying)
In surveying, a baseline is generally a line between two points on the Earth's surface and the direction and/or distance between them. In a triangulation network, at least one distance between two stations needs to be measured to calculate the size of the triangles by trigonometry. In relative Global Navigation Satellite System (GNSS) surveying, a baseline is the line between two GNSS receivers to determine the 3D coordinate difference. United States In the United States Public Land Survey System, a baseline is specifically the principal east-west line (i.e., a parallel) upon which all rectangular surveys in a defined area are based. The baseline meets its corresponding principal meridian (north-south line) at the point of origin, or '' initial point'', for the land survey. For example, the baseline for Nebraska and Kansas is shared as the border for both states, at the 40th parallel north. More specifically a baseline may be the line that divides a survey township ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fort Klapperkop
The Pretoria Forts consists of four forts built by the government of the South African Republic (ZAR) just before the outbreak of the Second Anglo-Boer War around their capital of Pretoria. History After the abortive Jameson Raid, the government of the ZAR became concerned about the safety of its capital city, Pretoria, both from foreign invasion as well as from the growing number of ''uitlanders'' ('foreigners') on the Witwatersrand. Consequently, a defence plan for Pretoria was drawn up by a former French artillery officer, Léon Grunberg. This plan was approved on 24 March 1896 by the Executive Council of the ZAR. The plan recommended that eight strategic positions around the city should be fortified by means of armoured turrets equipped with artillery. The positions identified were Schanskop, Kwaggaspoort, Daspoortrand, Magaliesberg-wes, Wonderboompoort, Derdepoort, Strubenkop and Klapperkop. The armoured turrets were subsequently found to be unacceptable, and thus the plan ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Brixton, Gauteng
Brixton is a predominantly working class suburb of Johannesburg, South Africa. It is the site of the landmark Sentech Tower, and is near the suburbs of Auckland Park and Melville. History The suburb of Brixton was first surveyed in 1902 from a portion of the farm ''Braamfontein''. The suburb was named after the Brixton suburb in London with many of the area's streets taking their names from districts in the British capital. The ridge on which the area was developed in the early 20th century offers a panoramic view of most surrounding areas of Johannesburg. Brixton consists of wide, neat streets containing some 980 houses, many of which are traditional semi-detached homes with low set walls. Architecture The suburb possesses several distinctive churches, with one having been built by Sir Herbert Baker and Frank Fleming. A few Brixton houses have been declared provincial heritage sites. The area also features one of the largest cemeteries in Johannesburg. Laid out in 1912, Bri ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tellurometer Model M RA 1
The tellurometer was the first successful microwave electronic distance measurement equipment. The name derives from the Latin ''tellus'', meaning Earth. History The original tellurometer, known as the Micro-Distancer MRA 1, was introduced in 1957. It was invented by Trevor Wadley of the Telecommunications Research Laboratory of the South African Council for Scientific and Industrial Research (CSIR). He was also responsible for the Wadley Loop receiver, which allowed precision tuning over wide bands, a task that had previously required switching out multiple crystal oscillators. Principle The tellurometer emits a microwave-frequency radio wave. The remote station carries a transponder that reradiates the incoming wave in a similar wave of more complex modulation. The resulting phase shift is a measure of the two-way distance travelled. The results appear on a cathode ray tube with circular sweep. Application The tellurometer design yields high accuracy distance measurements ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Racal
Racal Electronics plc was a British electronics company that was founded in 1950. Listed on the London Stock Exchange and once a constituent of the FTSE 100 Index, Racal was a diversified company, offering products including voice recorders and data recorders, point of sale terminals, laboratory instruments and military electronics, including radio and radar. At its height it was the third largest British electronics firm; it operated worldwide and employed over 30,000 people at its height. It was the parent company of Vodafone, before the mobile telephony provider was sold in 1991. Racal was bought by Thomson-CSF (now called Thales Group) in 2000. The purchase was expected to roughly double the size of the French defence giant's operations in the UK, a country that already represented one of its biggest export markets in Europe. In 2001, Racal Instruments Inc. became an independent company after a leveraged buyout from Thales. In 2004, it was acquired by EADS North America Def ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
