Understanding Transcription Conventions and Their Limits
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A transcription is an interpretation as well as a copy, since decisions about spelling, punctuation, unclear words and illegible passages all involve real judgement calls made by whoever produced the transcription, often working from handwriting that was difficult, faded or simply inconsistent across a long original document.
Different transcription projects follow different conventions, some modernising spelling for easier reading, others preserving the original exactly, including its errors, and knowing which convention a given transcription follows matters considerably when a precise original wording genuinely affects the meaning of a specific claim being made in the piece.
Where a transcription's accuracy genuinely matters to a story, checking it against the original document, or at least against the transcriber's own stated methodology, protects a writer from quietly inheriting someone else's interpretive choices as though they were simple, uncontested fact, when in reality every transcription carries the fingerprints of the person who produced it.