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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 Phillip ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Durban
Durban ( ) ( zu, eThekwini, from meaning 'the port' also called zu, eZibubulungwini for the mountain range that terminates in the area), nicknamed ''Durbs'',Ishani ChettyCity nicknames in SA and across the worldArticle on ''news24.com'' from 25 October 2017. Retrieved 2021-03-05.The names and the naming of Durban Website ''natalia.org.za'' (pdf). Retrieved 2021-03-05. is the third most populous city in South Africa after Johannesburg and Cape Town and the largest city in |
Basil Schonland
Sir Basil Ferdinand Jamieson Schonland OMG CBE FRS (2 February 1896 – 24 November 1972) was noted for his research on lightning, his involvement in the development of radar during World War II and for being the first president of the South African Council for Scientific and Industrial Research. Birth and parentage He was born in Grahamstown, Cape Colony to Selmar Schonland (botanist and a founder of Rhodes University) and Flora MacOwan, daughter of Peter MacOwan. Education In 1910, Schonland matriculated at the age of 14 from St. Andrew's College as the top pupil in the Cape Province. He later studied at Rhodes University and Gonville and Caius College, Cambridge in the years 1914-15 and 1919-20. World War I service During World War I, Schonland volunteered for service and served with the Signal Service of the Royal Engineers in France 1915-18. He was wounded at Arras, mentioned in despatches and was awarded the OBE. Early research After the war he became ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Canadian Advanced Digital Ionosonde
Canadians (french: Canadiens) are people identified with the country of Canada. This connection may be residential, legal, historical or cultural. For most Canadians, many (or all) of these connections exist and are collectively the source of their being ''Canadian''. Canada is a multilingual and multicultural society home to people of groups of many different ethnic, religious, and national origins, with the majority of the population made up of Old World immigrants and their descendants. Following the initial period of French and then the much larger British colonization, different waves (or peaks) of immigration and settlement of non-indigenous peoples took place over the course of nearly two centuries and continue today. Elements of Indigenous, French, British, and more recent immigrant customs, languages, and religions have combined to form the culture of Canada, and thus a Canadian identity. Canada has also been strongly influenced by its linguistic, geographic, and eco ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Plumstead, Cape Town
Plumstead is a residential suburb situated in the Southern Suburbs 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 Wynberg and the Constantia Valley was granted to the free burghers Hendrick Jergens and Johan Barrens, who were Dutch settlers. They called the land 'Rust' (Rest) and 'Werk' (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. An Englishman, Henry Batt, arrived in 1807 and bought 'Rust and Werk' and renamed it Plumstead, after a district of London. 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 the M5 expressway ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Salisbury Plain
Salisbury Plain is a chalk plateau in the south western part of central 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 and 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. 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 downs and plains beyond them loosely define its boundaries. To the north the scarp of the ... [...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 Conservative statesman and politician who was Prime Minister of the United Kingdom from 1957 to 1963. Caricatured as " Supermac", he was known for his pragmatism, wit and unflappability. Macmillan was badly 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 his family book-publishing business, then entered Parliament at the 1924 general election. Losing his seat in 1929, he regained it in 1931, soon after which he spoke out against the high rate of unemployment in Stockton-on-Tees. He opposed the appeasement of Germany practised by the Conservative government. He rose to high office during the Second World War as a protégé of Prime Minister Winston Churchill. In the 1950s Macmillan served as Foreign Secretary and Chancellor of the Exchequer under Anthony Eden. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Teddington
Teddington is a suburb in south-west London in the London Borough of Richmond upon Thames. In 2021, Teddington was named as the best place to live in London by ''The Sunday Times''. Historically in Middlesex, Teddington is situated on a long meander of the Thames between Hampton Wick and Strawberry Hill, Twickenham. Mostly residential, it stretches from the river to Bushy Park with a long high street of shops, restaurants and pubs. There is a suspension bridge over the lowest non-tidal lock on the Thames, Teddington Lock. At Teddington's centre is a mid-rise urban development, containing offices and apartments. Economy Teddington is bisected by an almost continuous road of shops, offices and other facilities running from the river to Bushy Park. There are two clusters of offices on this route; on the edge of Bushy Park the National Physical Laboratory, National Measurement Office and LGC form a scientific centre. Around Teddington station and the town centre are a numb ... [...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 is one of the most extensive government laboratories in the UK and has a prestigious reputation for its role in setting and maintaining physical standards for British industry. Founded in 1900, it is one of the oldest metrology institutes in the world. Research and development work at NPL has contributed to the advancement of many disciplines of science, including the development early computers in the late 1940s and 1950s, construction of the first accurate atomic clock in 1955, and the invention and pioneering 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, west London. It is under the management of the Department for Business, Energy and Industria ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Baseline (surveying)
In surveying, a baseline is a line between two points on the earth's surface and the direction and distance between them. In a triangulation network, at least one baseline between two stations needs to be measured to calculate the size of the triangles by trigonometry. In the United States Public Land Survey System, a baseline is 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 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 between north and south. "Baseline Road" in the United States Many communities in the United States have roads that run along survey baselines, many of which are named to reflect that fact. Some examples: * In Little Rock, ... [...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 pla ... [...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, B ... [...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 measurement ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
