"Prony brake" meaning in English

{
  "etymology_text": "Invented by Gaspard de Prony in 1821.",
  "forms": [
    {
      "form": "Prony brakes",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "Prony brake (plural Prony brakes)",
      "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": [
        "A device to measure the torque produced by an engine, essentially by wrapping a cord or belt around the output shaft and measuring the force transferred to the belt through friction."
      ],
      "id": "en-Prony_brake-en-noun-4Vjr1d2U",
      "links": [
        [
          "device",
          "device"
        ],
        [
          "measure",
          "measure"
        ],
        [
          "torque",
          "torque"
        ],
        [
          "engine",
          "engine"
        ],
        [
          "force",
          "force"
        ],
        [
          "friction",
          "friction"
        ]
      ]
    }
  ],
  "word": "Prony brake"
}

{
  "etymology_text": "Invented by Gaspard de Prony in 1821.",
  "forms": [
    {
      "form": "Prony brakes",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "Prony brake (plural Prony brakes)",
      "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 device to measure the torque produced by an engine, essentially by wrapping a cord or belt around the output shaft and measuring the force transferred to the belt through friction."
      ],
      "links": [
        [
          "device",
          "device"
        ],
        [
          "measure",
          "measure"
        ],
        [
          "torque",
          "torque"
        ],
        [
          "engine",
          "engine"
        ],
        [
          "force",
          "force"
        ],
        [
          "friction",
          "friction"
        ]
      ]
    }
  ],
  "word": "Prony brake"
}