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John Henry Lefroy

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Lieutenant-GeneralSir John Henry LefroyKCMGCBFRS (28 January 1817 – 11 April 1890) was a British Army officer and later colonial administrator who also distinguished himself with his scientific studies of the Earth's magnetism. BiographyLefroy was a son of the Rev. John Henry George Lefroy, of Ewshot House (subsequently Itchel) in Hampshire, England, and his wife, Sophia Cottrell. His sister Anne married the Irish landowner and politician John McClintock, who was created the 1st Baron Rathdonnell in 1868.

Toronto Magnetic and Meteorological ObservatoryToronto Magnetic and Meteorological ObservatoryThe Toronto Magnetic and Meteorological Observatory, formally the Louis B. Stewart Observatory, is a historical observatory located on the St. George campus of the University of Toronto, in Toronto, Ontario, Canada. The original log building was constructed in 1840 as part of a worldwide research project run by Edward Sabine to determine the cause of fluctuations in magnetic declination.Royal Military Academy, WoolwichRoyal Military Academy, WoolwichThe Royal Military Academy (RMA) at Woolwich, in south-east London, was a British Army military academy for the training of commissioned officers of the Royal Artillery and Royal Engineers. It later also trained officers of the Royal Corps of Signals and other technical corps. RMA Woolwich was commonly known as "The Shop" because its first building was a converted workshop of the Woolwich Arsenal.Edward SabineEdward SabineSir Edward Sabine (; 14 October 1788 – 26 June 1883) was an Irish physicist, geodesist,astronomer, geophysicist, ornithologist, polar explorer, soldier, and the 30th president of the Royal Society. He led the effort to establish a system of magnetic observatories in various parts of British territory all over the globe. Much of his life was devoted to their direction and to analysing their observations.Royal ArtilleryRoyal ArtilleryThe Royal Regiment of Artillery, commonly referred to as the Royal Artillery (RA) and colloquially known as "The Gunners", is one of two regiments that make up the artillery arm of the British Army. The Royal Regiment of Artillery comprises thirteen Regular Army regiments, the King's Troop Royal Horse Artillery and five Army Reserve regiments.Earth's magnetic fieldEarth's magnetic fieldEarth's magnetic field, also known as the geomagnetic field, is the magnetic field that extends from Earth's interior out into space, where it interacts with the solar wind, a stream of charged particles emanating from the Sun.BermudaBermudaBermuda is a British Overseas Territory in the North Atlantic Ocean. The closest land outside the territory is in the US state of North Carolina, about 1,035 km (643 mi) to the west-northwest. Bermuda is an archipelago consisting of 181 islands, although the most significant islands are connected by bridges and appear to form one landmass. It has a land area of 54 square kilometres (21 sq mi). Bermuda has a tropical climate, with warm winters and hot summers.British ArmyBritish ArmyThe British Army is the land warfare force of the United Kingdom responsible for defending the UK, the British Overseas Territories and Crown Dependencies. The British Army, founded in 1707, has seen involvement in most of the world's major wars throughout history, including both world wars.Fellow of the Royal SocietyFellow of the Royal SocietyFellowship of the Royal Society (FRS, ForMemRS and HonFRS) is an award granted by the Fellows of the Royal Society of London to individuals who have made a "substantial contribution to the improvement of natural knowledge, including mathematics, engineering science, and medical science". OverviewFellowship of the Society, the oldest known scientific academy in continuous existence, has been awarded to .Baron RathdonnellBaron Rathdonnell, of Rathdonnell in the County of Donegal, is a title in the Peerage of Ireland. It was created on 21 December 1868 for John McClintock, with remainder to the male issue of his deceased younger brother Captain William McClintock-Bunbury (who had represented County Carlow in the House of Commons). The barony is named after the townland of Rathdonnell, near the village of Trentagh, just north-west of Letterkenny.MagnetismMagnetismMagnetism is the class of physical attributes that occur through a magnetic field, which allows objects to attract or repel each other. Because both electric currents and magnetic moments of elementary particles give rise to a magnetic field, magnetism is one of two aspects of electromagnetism.Order of the BathOrder of the BathBritish order of chivalry established in 1725Coat of arms of the British monarch as sovereign of the Order of the BathThe Most Honourable Order of the Bath is a British order of chivalry founded by King George I on 18 May 1725. Recipients of the Order are usually senior military officers or senior civil servants, and the monarch bestows it on the advice of His Majesty's Government.Order of St Michael and St GeorgeOrder of St Michael and St GeorgeThe Most Distinguished Order of Saint Michael and Saint George is a British order of chivalry founded on 28 April 1818 by George, Prince of Wales (the future King George IV), while he was acting as prince regent for his father, King George III. It is named in honour of two military saints, Michael and George.

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