{
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  "docId": "10.5594-J01338",
  "document": {
    "abbrevTitle": "J SMPE",
    "abbrevTitle$meta": {
      "confidence": "high",
      "note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J01338.xml)",
      "source": "parsed",
      "updated": "2026-05-22T18:56:53.245Z",
      "version": "smpte-journal-article-nlm@v1"
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    "abstract": "The limits of illumination available in a projector are fixed by three factors: the size and brilliance of the light source, the effective aperture of the optical system and the design of the condensing lenses. In modern 16 mm. machines of the standard type, about 100 to 120 lumens are available through an f/2 optical system; these values, which are not corrected for shutter and film losses, mean that 1.6 to 2.0 per cent of the total radiation is being used. The use of low voltage lamps has not changed this ratio to any extent. The effect of varying each of the above factors is discussed, and the increase in screen brightness that is likely to be obtained is estimated.",
    "abstract$meta": {
      "confidence": "high",
      "note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J01338.xml)",
      "source": "parsed",
      "updated": "2026-05-22T18:56:53.245Z",
      "version": "smpte-journal-article-nlm@v1"
    },
    "articleType": "research-article",
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      "confidence": "high",
      "note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J01338.xml)",
      "source": "parsed",
      "updated": "2026-05-22T18:56:53.245Z",
      "version": "smpte-journal-article-nlm@v1"
    },
    "authors": [
      "A. A. Cook"
    ],
    "authors$meta": {
      "confidence": "high",
      "note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J01338.xml)",
      "source": "parsed",
      "updated": "2026-05-22T18:56:53.245Z",
      "version": "smpte-journal-article-nlm@v1"
    },
    "copyright": {
      "holder": "Society of Motion Picture and Television Engineers, Inc.",
      "holder$meta": {
        "confidence": "high",
        "note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J01338.xml)",
        "source": "parsed",
        "updated": "2026-05-22T18:56:53.245Z",
        "version": "smpte-journal-article-nlm@v1"
      },
      "year": "1932",
      "year$meta": {
        "confidence": "high",
        "note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J01338.xml)",
        "source": "parsed",
        "updated": "2026-05-22T18:56:53.245Z",
        "version": "smpte-journal-article-nlm@v1"
      }
    },
    "copyright$meta": {
      "confidence": "high",
      "note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J01338.xml)",
      "source": "parsed",
      "updated": "2026-05-22T18:56:53.245Z",
      "version": "smpte-journal-article-nlm@v1"
    },
    "docId": "10.5594-J01338",
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      "confidence": "high",
      "note": "Derived from DOI 10.5594/J01338",
      "source": "parsed",
      "updated": "2026-05-22T18:56:53.245Z",
      "version": "smpte-journal-article-nlm@v1"
    },
    "docLabel": "Journal of the Society of Motion Picture Engineers ( Volume: 18, Issue: 4, April 1932)",
    "docLabel$meta": {
      "confidence": "medium",
      "note": "Composed from journal title, volume, issue and date",
      "source": "inferred",
      "updated": "2026-05-22T18:56:53.245Z",
      "version": "smpte-journal-article-nlm@v1"
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    "docTitle": "Optics of Projectors for 16 MM. Film",
    "docTitle$meta": {
      "confidence": "high",
      "note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J01338.xml)",
      "source": "parsed",
      "updated": "2026-05-22T18:56:53.245Z",
      "version": "smpte-journal-article-nlm@v1"
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    "docType": "Journal Article",
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      "confidence": "high",
      "note": "NLM <article> — SMPTE journal paper",
      "source": "inferred",
      "updated": "2026-05-22T18:56:53.245Z",
      "version": "smpte-journal-article-nlm@v1"
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    "doi": "10.5594/J01338",
    "doi$meta": {
      "confidence": "high",
      "note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J01338.xml)",
      "source": "parsed",
      "updated": "2026-05-22T18:56:53.245Z",
      "version": "smpte-journal-article-nlm@v1"
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    "href": "https://doi.org/10.5594/J01338",
    "href$meta": {
      "confidence": "high",
      "note": "Constructed from DOI 10.5594/J01338",
      "source": "inferred",
      "updated": "2026-05-22T18:56:53.245Z",
      "version": "smpte-journal-article-nlm@v1"
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    "issn": {
      "print": "0097-5834",
      "print$meta": {
        "confidence": "high",
        "note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J01338.xml)",
        "source": "parsed",
        "updated": "2026-05-22T18:56:53.245Z",
        "version": "smpte-journal-article-nlm@v1"
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    },
    "issn$meta": {
      "confidence": "high",
      "note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J01338.xml)",
      "source": "parsed",
      "updated": "2026-05-22T18:56:53.245Z",
      "version": "smpte-journal-article-nlm@v1"
    },
    "journalAcronym": "MIJR",
    "journalAcronym$meta": {
      "confidence": "high",
      "note": "Parsed from journal_metadata XML (_source/SMPTE/APTARA/DL Project Files/08182015 BACKFILE JOURNAL FRESH/smptej_18_4/MIJR15Vol18No4.xml)",
      "source": "parsed",
      "updated": "2026-06-16T00:32:03.060Z",
      "version": "smpte-journal-issue-xml@v1"
    },
    "number": "4",
    "number$meta": {
      "confidence": "high",
      "note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J01338.xml)",
      "source": "parsed",
      "updated": "2026-05-22T18:56:53.245Z",
      "version": "smpte-journal-article-nlm@v1"
    },
    "pages": "461–470",
    "pages$meta": {
      "confidence": "high",
      "note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J01338.xml)",
      "source": "parsed",
      "updated": "2026-05-22T18:56:53.245Z",
      "version": "smpte-journal-article-nlm@v1"
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    "publicationDate": "1932-04-01",
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      "confidence": "high",
      "note": "Day absent in NLM source — padded to 01",
      "source": "parsed",
      "updated": "2026-05-22T18:56:53.245Z",
      "version": "smpte-journal-article-nlm@v1"
    },
    "publisher": "SMPTE",
    "publisher$meta": {
      "confidence": "high",
      "note": "Normalised to registry \"SMPTE\" convention from NLM publisher-name (The Society of Motion Picture and Television Engineers)",
      "source": "inferred",
      "updated": "2026-05-22T18:56:53.245Z",
      "version": "smpte-journal-article-nlm@v1"
    },
    "publisherLocation": {
      "city": "White Plains, NY",
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        "confidence": "high",
        "note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J01338.xml)",
        "source": "parsed",
        "updated": "2026-05-22T18:56:53.245Z",
        "version": "smpte-journal-article-nlm@v1"
      },
      "country": "USA",
      "country$meta": {
        "confidence": "high",
        "note": "Parsed from journal_metadata XML (_source/SMPTE/APTARA/DL Project Files/08182015 BACKFILE JOURNAL FRESH/smptej_18_4/MIJR15Vol18No4.xml)",
        "source": "parsed",
        "updated": "2026-06-16T00:32:03.060Z",
        "version": "smpte-journal-issue-xml@v1"
      }
    },
    "publisherLocation$meta": {
      "confidence": "high",
      "note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J01338.xml)",
      "source": "parsed",
      "updated": "2026-05-22T18:56:53.245Z",
      "version": "smpte-journal-article-nlm@v1"
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      "active": true,
      "active$meta": {
        "confidence": "medium",
        "note": "No explicit status in NLM source — journal articles default active",
        "source": "inferred",
        "updated": "2026-05-22T18:56:53.245Z",
        "version": "smpte-journal-article-nlm@v1"
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    "volume": "18",
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      "confidence": "high",
      "note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J01338.xml)",
      "source": "parsed",
      "updated": "2026-05-22T18:56:53.245Z",
      "version": "smpte-journal-article-nlm@v1"
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