English Dictionary

Magdeburg hemisphere

名詞

歴史的

(historical) Either of a pair of large copper hemispheres, with mating rims, that were used to demonstrate the power of atmospheric pressure. When the rims were sealed with grease and the air was pumped out, the sphere contained a vacuum and could not be pulled apart even by teams of horses.

日本語の意味

歴史的な実験装置の一つ。大きな銅製の半球が一対になっており、縁が互いに噛み合う形状をしている。これらはグリースで密閉された状態で空気を抜くことにより内部が真空になり、大気圧によって互いに押し合って引き離すことができなくなる性質を示す。

At the museum the curator rolled out a Magdeburg hemisphere to demonstrate how atmospheric pressure could keep two copper halves firmly sealed.

博物館で学芸員は、真空実験に使われた噛み合う縁を持つ大型の銅製半球を展示して、大気圧が二つの銅の半球をしっかり閉じ合わせることを示した。

意味（1）

(historical) Either of a pair of large copper hemispheres, with mating rims, that were used to demonstrate the power of atmospheric pressure. When the rims were sealed with grease and the air was pumped out, the sphere contained a vacuum and could not be pulled apart even by teams of horses.

Magdeburg hemispheres （ plural ）