trigonometrical field station

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Skew arch — A skew arch (also known as an oblique arch) is a method of construction that enables an arch bridge to span an obstacle at some angle other than a right angle. This results in the faces of the arch not being perpendicular to its abutments and its … Wikipedia
Lawrence Wells — Infobox Scientist name=Wells, Lawrence Allen box width = image width = caption = birth date = 30 April 1860 birth place = Penola, South Australia, Australia death date = 11 May 1938 death place = Australia residence = citizenship = nationality =… … Wikipedia

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