{
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"abbrevTitle": "J SMPE",
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"note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J06543.xml)",
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"abstract": "In the early days of motion pictures, projection objectives were supplied in a series of focal lengths which differed from each other by only an eighth of an inch. The burden of making and carrying in stock so great a variety of focal lengths became oppressive for both the manufacturer and the dealer and, in consequence, the Society at its Chicago meeting in 19171 adopted as standard a series of focal lengths in which the interval between numbers was a quarter of an inch. This practice has been followed up to the present day. The only further attention given by the Society to the subject of projection lens focal lengths consisted in adopting a standard permissible tolerance of plus or minus 1 per cent.2",
"abstract$meta": {
"confidence": "high",
"note": "Parsed from journal_metadata XML (_source/SMPTE/APTARA/DL Project Files/08182015 BACKFILE JOURNAL FRESH/smptej_15_3/MIJR15Vol15No3.xml)",
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"version": "smpte-journal-issue-xml@v1"
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"confidence": "high",
"note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J06543.xml)",
"source": "parsed",
"updated": "2026-05-22T19:19:44.900Z",
"version": "smpte-journal-article-nlm@v1"
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"authors": [
"Wilbur B. Rayton"
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"confidence": "high",
"note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J06543.xml)",
"source": "parsed",
"updated": "2026-05-22T19:19:44.900Z",
"version": "smpte-journal-article-nlm@v1"
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"copyright": {
"holder": "Society of Motion Picture and Television Engineers, Inc.",
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"confidence": "high",
"note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J06543.xml)",
"source": "parsed",
"updated": "2026-05-22T19:19:44.900Z",
"version": "smpte-journal-article-nlm@v1"
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"year": "1930",
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"confidence": "high",
"note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J06543.xml)",
"source": "parsed",
"updated": "2026-05-22T19:19:44.900Z",
"version": "smpte-journal-article-nlm@v1"
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"confidence": "high",
"note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J06543.xml)",
"source": "parsed",
"updated": "2026-05-22T19:19:44.900Z",
"version": "smpte-journal-article-nlm@v1"
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"docId": "10.5594-J06543",
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"note": "Derived from DOI 10.5594/J06543",
"source": "parsed",
"updated": "2026-05-22T19:19:44.900Z",
"version": "smpte-journal-article-nlm@v1"
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"docLabel": "Journal of the Society of Motion Picture Engineers ( Volume: 15, Issue: 3, September 1930)",
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"note": "Composed from journal title, volume, issue and date",
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"updated": "2026-05-22T19:19:44.900Z",
"version": "smpte-journal-article-nlm@v1"
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"docTitle": "A Proposed New Series of Standard Focal Lengths for Motion Picture Projection Objectives",
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"confidence": "high",
"note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J06543.xml)",
"source": "parsed",
"updated": "2026-05-22T19:19:44.900Z",
"version": "smpte-journal-article-nlm@v1"
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"docType": "Journal Article",
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"note": "NLM — SMPTE journal paper",
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"updated": "2026-05-22T19:19:44.900Z",
"version": "smpte-journal-article-nlm@v1"
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"doi": "10.5594/J06543",
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"confidence": "high",
"note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J06543.xml)",
"source": "parsed",
"updated": "2026-05-22T19:19:44.900Z",
"version": "smpte-journal-article-nlm@v1"
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"href": "https://doi.org/10.5594/J06543",
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"confidence": "high",
"note": "Constructed from DOI 10.5594/J06543",
"source": "inferred",
"updated": "2026-05-22T19:19:44.900Z",
"version": "smpte-journal-article-nlm@v1"
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"issn": {
"print": "0097-5834",
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"confidence": "high",
"note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J06543.xml)",
"source": "parsed",
"updated": "2026-05-22T19:19:44.900Z",
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},
"issn$meta": {
"confidence": "high",
"note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J06543.xml)",
"source": "parsed",
"updated": "2026-05-22T19:19:44.900Z",
"version": "smpte-journal-article-nlm@v1"
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"journalAcronym": "MIJR",
"journalAcronym$meta": {
"confidence": "high",
"note": "Parsed from journal_metadata XML (_source/SMPTE/APTARA/DL Project Files/08182015 BACKFILE JOURNAL FRESH/smptej_15_3/MIJR15Vol15No3.xml)",
"source": "parsed",
"updated": "2026-06-16T16:11:59.617Z",
"version": "smpte-journal-issue-xml@v1"
},
"number": "3",
"number$meta": {
"confidence": "high",
"note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J06543.xml)",
"source": "parsed",
"updated": "2026-05-22T19:19:44.900Z",
"version": "smpte-journal-article-nlm@v1"
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"pages": "277–280",
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"confidence": "high",
"note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J06543.xml)",
"source": "parsed",
"updated": "2026-05-22T19:19:44.900Z",
"version": "smpte-journal-article-nlm@v1"
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"publicationDate": "1930-09-01",
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"source": "parsed",
"updated": "2026-05-22T19:19:44.900Z",
"version": "smpte-journal-article-nlm@v1"
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"publisher": "SMPTE",
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"confidence": "high",
"note": "Normalised to registry \"SMPTE\" convention from NLM publisher-name (The Society of Motion Picture and Television Engineers)",
"source": "inferred",
"updated": "2026-05-22T19:19:44.900Z",
"version": "smpte-journal-article-nlm@v1"
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"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_J06543.xml)",
"source": "parsed",
"updated": "2026-05-22T19:19:44.900Z",
"version": "smpte-journal-article-nlm@v1"
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"country": "USA",
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"confidence": "high",
"note": "Parsed from journal_metadata XML (_source/SMPTE/APTARA/DL Project Files/08182015 BACKFILE JOURNAL FRESH/smptej_15_3/MIJR15Vol15No3.xml)",
"source": "parsed",
"updated": "2026-06-16T16:11:59.617Z",
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"confidence": "high",
"note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J06543.xml)",
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"updated": "2026-05-22T19:19:44.900Z",
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"status": {
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"updated": "2026-05-22T19:19:44.900Z",
"version": "smpte-journal-article-nlm@v1"
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"volume": "15",
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"note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J06543.xml)",
"source": "parsed",
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