Thomas Gwyn Elger
Encyclopedia
Thomas Gwyn Empy Elger was an English
England
England is a country that is part of the United Kingdom. It shares land borders with Scotland to the north and Wales to the west; the Irish Sea is to the north west, the Celtic Sea to the south west, with the North Sea to the east and the English Channel to the south separating it from continental...

 lunar
Moon
The Moon is Earth's only known natural satellite,There are a number of near-Earth asteroids including 3753 Cruithne that are co-orbital with Earth: their orbits bring them close to Earth for periods of time but then alter in the long term . These are quasi-satellites and not true moons. For more...

 mapper and the first director of the Lunar Section of the British Astronomical Association
British Astronomical Association
The British Astronomical Association is the senior national association of amateur astronomers in the UK.-Function:It encourages observational astronomy by non-professionals in areas which cannot be covered by professional observatories...

 (BAA).

He was born in Bedford
Bedford
Bedford is the county town of Bedfordshire, in the East of England. It is a large town and the administrative centre for the wider Borough of Bedford. According to the former Bedfordshire County Council's estimates, the town had a population of 79,190 in mid 2005, with 19,720 in the adjacent town...

, where the family had been established for several generations. His father Thomas Gwyn Elger (1794 – 4 April 1841) was an architect and builder. Grandfather, father and son engaged in the town politics, and all held the post of mayor.

He studied at University College London
University College London
University College London is a public research university located in London, United Kingdom and the oldest and largest constituent college of the federal University of London...

 and adopted the profession of a civil engineer. He was engaged in several important works, including the Metropolitan Railway
Metropolitan Line
The Metropolitan line is part of the London Underground. It is coloured in Transport for London's Corporate Magenta on the Tube map and in other branding. It was the first underground railway in the world, opening as the Metropolitan Railway on 10 January 1863...

 and the Severn Valley Railway
Severn Valley Railway
The Severn Valley Railway is a heritage railway in Shropshire and Worcestershire, England. The line runs along the Severn Valley from Bridgnorth to Kidderminster, following the course of the River Severn for much of its route...

. His surveys for railway construction in Holstein
Holstein
Holstein is the region between the rivers Elbe and Eider. It is part of Schleswig-Holstein, the northernmost state of Germany....

 were put to a stop by the war with Prussia and Austria in 1864.

Soon afterwards he relinquished the active pursuit of his profession and devoted himself to scientific studies. He had developed a strong taste for astronomy already at an early age and erected his first observatory in Bedford.
Elger observed with an 8.5 inch reflector
Reflecting telescope
A reflecting telescope is an optical telescope which uses a single or combination of curved mirrors that reflect light and form an image. The reflecting telescope was invented in the 17th century as an alternative to the refracting telescope which, at that time, was a design that suffered from...

. His sketches from 1884 to 1896 are now in the possession of the BAA. He is best known as a careful and indefatigable selenographer, and for this work his artistic skill eminently qualified him.

He is most remembered for his book The Moon: A full Description and Map of its Principal Physical Features. Published in 1895, its maps are still highly regarded by lunar observers due to their uncluttered nature.

Elger was member of several astronomical associations, as the Royal Astronomical Society
Royal Astronomical Society
The Royal Astronomical Society is a learned society that began as the Astronomical Society of London in 1820 to support astronomical research . It became the Royal Astronomical Society in 1831 on receiving its Royal Charter from William IV...

, the short-lived Selenographical Society and the British Astronomical Association
British Astronomical Association
The British Astronomical Association is the senior national association of amateur astronomers in the UK.-Function:It encourages observational astronomy by non-professionals in areas which cannot be covered by professional observatories...

. Besides his astronomical work, he was an ardent archaeologist and founded the Bedfordshire Natural History Society and Field Club.

He is remembered by the lunar crater Elger
Elger (crater)
Elger is a lunar crater that lies along the southern edge of Palus Epidemiarum, the Marsh of Epidemics, in the southwest part of the Moon's near side...

.
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