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The Old Bedford River, photographed from the bridge at Welney, Norfolk (2008); the camera is looking downstream, south-west of the bridge. The Bedford Level experiment was a series of observations carried out along a 6-mile (10 km) length of the Old Bedford River on the Bedford Level of the Cambridgeshire Fens in the United Kingdom during the 19th and early 20th centuries to deny the curvature ...
Refraction can give the impression that Earth's surface is flat, curved more convexly than it is, or even that it is concave (this is what happened in various trials of the Bedford Level experiment). The phenomenon of variable atmospheric bending can be seen when distant objects appear to be broken into pieces or even turned upside down.
To fairly represent the Bedford Level (or other) experiment, there would need to be 1,000 marker poles placed between the two letters T and A in the above diagram and each of the 1,000 marker poles would be 1 mile (1.609 km) apart, given that the Earth is 24,901 miles (40,075 km) in circumference.
Henry Yule Oldham, (14 December 1862 – 14 March 1951) was a teacher and geographer who, in 1901, conducted the definitive version of the Bedford Level experiment, a proof that the Earth is a sphere.
Rowbotham started out as an organiser of an Owenite community at Manea in the Fens, where he formulated his ideas about the Earth.After measuring a lack of curvature on the long straight drainage ditches of the Bedford Levels in his first Bedford Level experiment, he was convinced of the flatness of the Earth and began to lecture on the topic.
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Funds for the work were provided by the Earl of Bedford and thirteen other Adventurers. Of the land reclaimed, the fourteen men were to receive 43,000 acres (170 km 2 ), to be shared between them, while 12,000 acres (49 km 2 ) were to be given to the king, and another 40,000 acres (160 km 2 ) were designated to provide income to maintain the ...
Date/Time Thumbnail Dimensions User Comment; current: 14:37, 2 September 2021: 725 × 591 (147 KB): Mary Mark Ockerbloom: Uploaded a work by V. E. McKelvey from "Principles of the mineral resource classification system of the U.S. Bureau of Mines and U.S. Geological Survey : Geological Survey Bulletin 1450-A" by Thomas S. Kleppe and V. E. McKelvey, U.S. Bureau of Mines and U.S. Geological Survey.