"Roberval balance" meaning in English

{
  "etymology_text": "Presented to the French Academy of Sciences by the French mathematician Gilles Personne de Roberval in 1669.",
  "forms": [
    {
      "form": "Roberval balances",
      "tags": [
        "plural"
      ]
    }
  ],
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      "args": {},
      "expansion": "Roberval balance (plural Roberval balances)",
      "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"
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          "source": "w"
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      "glosses": [
        "A kind of weighing scale with two identical horizontal beams attached, one directly above the other, to a vertical column."
      ],
      "id": "en-Roberval_balance-en-noun-NBqovXFG",
      "synonyms": [
        {
          "word": "Roberval's balance"
        }
      ],
      "wikipedia": [
        "Roberval balance"
      ]
    }
  ],
  "word": "Roberval balance"
}

{
  "etymology_text": "Presented to the French Academy of Sciences by the French mathematician Gilles Personne de Roberval in 1669.",
  "forms": [
    {
      "form": "Roberval balances",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "Roberval balance (plural Roberval balances)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English eponyms",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "glosses": [
        "A kind of weighing scale with two identical horizontal beams attached, one directly above the other, to a vertical column."
      ],
      "wikipedia": [
        "Roberval balance"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "Roberval's balance"
    }
  ],
  "word": "Roberval balance"
}