"spool cannon" meaning in English

{
  "forms": [
    {
      "form": "spool cannons",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "spool cannon (plural spool cannons)",
      "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"
        }
      ],
      "examples": [
        {
          "ref": "The Adventures of Tom Sawyer, by Mark Twain. Ch.2",
          "text": "He had besides the things before mentioned, twelve marbles, part of a jews-harp, a piece of blue bottle-glass to look through, a spool cannon, a key that wouldn't unlock anything, […]"
        }
      ],
      "glosses": [
        "A child's homemade toy made by attaching an elastic band to a cotton reel to form a slingshot that could shoot a pencil or other slim object through the bore of the reel."
      ],
      "id": "en-spool_cannon-en-noun-k~6omWTh",
      "links": [
        [
          "homemade",
          "homemade"
        ],
        [
          "toy",
          "toy"
        ],
        [
          "cotton reel",
          "cotton reel"
        ],
        [
          "slingshot",
          "slingshot"
        ]
      ]
    }
  ],
  "word": "spool cannon"
}

{
  "forms": [
    {
      "form": "spool cannons",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "spool cannon (plural spool cannons)",
      "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"
      ],
      "examples": [
        {
          "ref": "The Adventures of Tom Sawyer, by Mark Twain. Ch.2",
          "text": "He had besides the things before mentioned, twelve marbles, part of a jews-harp, a piece of blue bottle-glass to look through, a spool cannon, a key that wouldn't unlock anything, […]"
        }
      ],
      "glosses": [
        "A child's homemade toy made by attaching an elastic band to a cotton reel to form a slingshot that could shoot a pencil or other slim object through the bore of the reel."
      ],
      "links": [
        [
          "homemade",
          "homemade"
        ],
        [
          "toy",
          "toy"
        ],
        [
          "cotton reel",
          "cotton reel"
        ],
        [
          "slingshot",
          "slingshot"
        ]
      ]
    }
  ],
  "word": "spool cannon"
}