Born: June 4, 1809, London [Died] December 28, 1871. Gazipur, India. British geophysicist. Graduated from Cambridge University. Travelled to India as a missionary for the East India Company (1838), and became vice-bishop of Calcutta in 1850. In 1855, he measured gravity at the southern foot of the Himalayas, and found that the deviation of the vertical line based on this was only 40% of the predicted value. He hypothesized that the low-density crust that makes up the mountains had deep roots underground and was in equilibrium at a certain depth (80-120 km) underground, and proposed the concept of isostasy in 1856. Member of the Royal Society of London (66). His main work was The Mathematical Principles of Mechanical Philosophy (36). Pratt |
[生]1809.6.4. ロンドン [没]1871.12.28. インド,ガジプール イギリスの地球物理学者。ケンブリッジ大学卒業。東インド会社の宣教師としてインドに渡り (1838) ,1850年にカルカッタの副僧正。 55年ヒマラヤ山脈の南麓で重力を測定し,これに基づく鉛直線偏差が予想値の4割にすぎないところから,山体をなす密度の小さい地殻が地下へ深く根をおろし,地下の一定深度 (80~120km) のところで釣合っていると考えて,56年にアイソスタシーの概念を提示した。ロンドン・ロイヤル・ソサエティ会員 (66) 。主著『機械論哲学の数学的原理』 The Mathematical Principles of Mechanical Philosophy (36) 。 プラット
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