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Bedford Level experiment
The Bedford Level Experiment is a series of observations carried out along a length of the Old Bedford River on the Bedford Level, Norfolk, England, during the nineteenth and early twentieth centuries. It was an attempt to determine the shape of the Earth. Early results seemed to prove the Earth to be flat, but most later attempts to reproduce the observations firmly support that the Earth is a sphere. 〔
==Method==
At the point chosen for all the experiments the river is a slow-flowing drainage canal running in an uninterrupted straight line for a stretch to the north-east of the village of Welney. The most famous of the observations, and the one that was taught in schools until photographs of the Earth from space became available, involved a set of three poles fixed at equal height above water level along this length. As the surface of the water was assumed to be level, the discovery that the middle pole, when viewed carefully through a theodolite, was almost higher than the poles at each end was finally accepted as a new proof that the surface of the earth was indeed curved.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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