"Magdeburg hemisphere" meaning in English

{
  "etymology_text": "They were designed by Otto von Guericke, a German scientist and mayor of Magdeburg, in 1656.",
  "forms": [
    {
      "form": "Magdeburg hemispheres",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "Magdeburg hemisphere (plural Magdeburg hemispheres)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "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."
      ],
      "id": "en-Magdeburg_hemisphere-en-noun-nRAoauiC",
      "links": [
        [
          "copper",
          "copper"
        ],
        [
          "hemisphere",
          "hemisphere"
        ],
        [
          "demonstrate",
          "demonstrate"
        ],
        [
          "atmospheric pressure",
          "atmospheric pressure"
        ],
        [
          "vacuum",
          "vacuum"
        ]
      ],
      "raw_glosses": [
        "(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."
      ],
      "tags": [
        "historical"
      ],
      "wikipedia": [
        "Magdeburg hemispheres"
      ]
    }
  ],
  "word": "Magdeburg hemisphere"
}

{
  "etymology_text": "They were designed by Otto von Guericke, a German scientist and mayor of Magdeburg, in 1656.",
  "forms": [
    {
      "form": "Magdeburg hemispheres",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "Magdeburg hemisphere (plural Magdeburg hemispheres)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with historical senses",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "glosses": [
        "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."
      ],
      "links": [
        [
          "copper",
          "copper"
        ],
        [
          "hemisphere",
          "hemisphere"
        ],
        [
          "demonstrate",
          "demonstrate"
        ],
        [
          "atmospheric pressure",
          "atmospheric pressure"
        ],
        [
          "vacuum",
          "vacuum"
        ]
      ],
      "raw_glosses": [
        "(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."
      ],
      "tags": [
        "historical"
      ],
      "wikipedia": [
        "Magdeburg hemispheres"
      ]
    }
  ],
  "word": "Magdeburg hemisphere"
}