"Wheatstone's rod" meaning in English

{
  "etymology_text": "Named after Charles Wheatstone, who devised them.",
  "forms": [
    {
      "form": "Wheatstone's rods",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "Wheatstone's rod (plural Wheatstone's rods)",
      "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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          "source": "w"
        },
        {
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          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Acoustics",
          "orig": "en:Acoustics",
          "parents": [
            "Applied sciences",
            "Physics",
            "Sound",
            "Sciences",
            "Energy",
            "All topics",
            "Nature",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "Either of a pair of flexible rods whose periods of vibration in two planes at right angles are in some exact ratio to one another. When one end of such a rod is fixed, the free end describes through vibration the corresponding Lissajous figure."
      ],
      "id": "en-Wheatstone's_rod-en-noun-7F0IdTQ~",
      "links": [
        [
          "acoustics",
          "acoustics"
        ],
        [
          "flexible",
          "flexible"
        ],
        [
          "rod",
          "rod"
        ],
        [
          "period",
          "period"
        ],
        [
          "vibration",
          "vibration"
        ],
        [
          "plane",
          "plane"
        ],
        [
          "right angle",
          "right angle"
        ],
        [
          "ratio",
          "ratio"
        ],
        [
          "Lissajous figure",
          "Lissajous figure"
        ]
      ],
      "qualifier": "acoustics",
      "raw_glosses": [
        "(acoustics) Either of a pair of flexible rods whose periods of vibration in two planes at right angles are in some exact ratio to one another. When one end of such a rod is fixed, the free end describes through vibration the corresponding Lissajous figure."
      ],
      "wikipedia": [
        "Charles Wheatstone"
      ]
    }
  ],
  "word": "Wheatstone's rod"
}

{
  "etymology_text": "Named after Charles Wheatstone, who devised them.",
  "forms": [
    {
      "form": "Wheatstone's rods",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "Wheatstone's rod (plural Wheatstone's rods)",
      "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",
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        "Pages with entries",
        "en:Acoustics"
      ],
      "glosses": [
        "Either of a pair of flexible rods whose periods of vibration in two planes at right angles are in some exact ratio to one another. When one end of such a rod is fixed, the free end describes through vibration the corresponding Lissajous figure."
      ],
      "links": [
        [
          "acoustics",
          "acoustics"
        ],
        [
          "flexible",
          "flexible"
        ],
        [
          "rod",
          "rod"
        ],
        [
          "period",
          "period"
        ],
        [
          "vibration",
          "vibration"
        ],
        [
          "plane",
          "plane"
        ],
        [
          "right angle",
          "right angle"
        ],
        [
          "ratio",
          "ratio"
        ],
        [
          "Lissajous figure",
          "Lissajous figure"
        ]
      ],
      "qualifier": "acoustics",
      "raw_glosses": [
        "(acoustics) Either of a pair of flexible rods whose periods of vibration in two planes at right angles are in some exact ratio to one another. When one end of such a rod is fixed, the free end describes through vibration the corresponding Lissajous figure."
      ],
      "wikipedia": [
        "Charles Wheatstone"
      ]
    }
  ],
  "word": "Wheatstone's rod"
}