"long primer" meaning in English

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  "lang_code": "en",
  "pos": "noun",
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          "ref": "1914, Ernest Bramah, Max Carrados:",
          "text": "The difference to you of treacle on a marble background is scarcely greater than that of printers' ink on newspaper to me. But anything smaller than pica I do not read with comfort, and below long primer I cannot read at all.",
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        "Alternative form of Long Primer."
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  "word": "long primer"
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  "lang_code": "en",
  "pos": "noun",
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          "word": "Long Primer"
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          "ref": "1914, Ernest Bramah, Max Carrados:",
          "text": "The difference to you of treacle on a marble background is scarcely greater than that of printers' ink on newspaper to me. But anything smaller than pica I do not read with comfort, and below long primer I cannot read at all.",
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  "word": "long primer"
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