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The modern four-equation vector formulation is not the original wording.", "domain": "电磁学" }, "sources": [ { "citation": "Royal Society archive PT/72/7, Maxwell’s original manuscript", "url": "https://makingscience.royalsociety.org/items/PT_72_7" } ], "statement": "# Maxwell: A Dynamical Theory of the Electromagnetic Field\n\n## The question\n\nElectricity, magnets and light were once investigated through rather different experiments. A current can affect a compass, a changing magnetic arrangement can induce an electrical effect, and light crosses empty space. Could these observations belong to the same physical theory? Maxwell's 1865 paper made a mathematical electromagnetic field account central to that question, rather than treating each phenomenon as a separate curiosity.\n\n## The idea\n\nThe field description assigns physical quantities throughout space. Relations between their spatial and temporal changes can support traveling disturbances. Maxwell connected the propagation predicted by his theory with light. His original notation and mechanical discussion differ from the compact modern set of equations often shown in textbooks. Reading the historical contribution does not require pretending those later equations appeared unchanged in the manuscript.\n\n## Why it matters\n\nA unifying theory can be valuable even before every technological application exists. Here the connection between electricity, magnetism and optics provided a shared way to analyze apparently different measurements. The recorded S grade concerns that field-theory synthesis. It does not award Maxwell authorship of every later electromagnetic experiment, communication device or reformulation. Those developments have their own contributors, dates and evidence.\n\n## A teaching example\n\nPicture a long line of people passing a small motion along without each person walking to the far end. A disturbance can travel through a system even though the local elements do something much smaller. This is a teaching analogy for distinguishing propagation from transport of a material object. An electromagnetic field is not a row of people, and the analogy cannot establish its equations or speed. Ask instead which measured quantity changes locally, which relation couples neighboring regions, and how a proposed model predicts a traveling disturbance.\n\n## Scope and a useful next step\n\nThis record covers the historical electromagnetic account of light, not a complete quantum theory of matter or an experimental certification of every modern application. The Royal Society archive identifies the manuscript and publication history. A manageable next step is to compare one original passage with a modern textbook formulation, carefully marking translated notation and later additions. The comparison should preserve the original claim rather than silently crediting the historical paper with the entire modern framework.\n\n## Scientific scope\n\nThe manuscript dates to 1864 and publication to 1865. The modern four-equation vector formulation is not the original wording.\n\n## Sources for this explanation\n\n- [Royal Society archive PT/72/7, Maxwell’s original manuscript](https://makingscience.royalsociety.org/items/PT_72_7): Identified original contribution source. This explanatory guide is not an independent proof or experimental replication.\n", "summary": "A unified field theory of electricity, magnetism and light, foundational to modern electromagnetism.", "title": "Maxwell: A Dynamical Theory of the Electromagnetic Field" }, "record_id": "urn:uuid:6fc88958-e121-4f53-a956-adf80b8ccf94", "version": 1, "source_ref": { "record_id": "urn:uuid:6fc88958-e121-4f53-a956-adf80b8ccf94", "version": 1, "content_hash": "sha256:de451a887306154b856ae4a96b4dd9564655b4c7ca2214f6cfab73c6862c0d37" }, "export_view": "wrs-public-editorial-view-1", "public_view_hash": "sha256:b39a589e20c29d6c9e3877d1a890c5c6d326ab011ab939f8ab76d0976795946f" }, "target": { "record_id": "urn:uuid:6fc88958-e121-4f53-a956-adf80b8ccf94", "version": 1, "content_hash": "sha256:de451a887306154b856ae4a96b4dd9564655b4c7ca2214f6cfab73c6862c0d37" }, "published_grade": { "profile": "wrs-published-grade-1", "edition": "2026-10-28.1", "id": "maxwell", "entry_id": "maxwell", "revision": 1, "title": "Maxwell: A Dynamical Theory of the Electromagnetic Field", "context": "Classical electromagnetic field theory", "track": "Physical theory", "band": "S", "modifier": null, "status": "PROVISIONAL_EDITORIAL", "assessed_on": "2026-09-13", "evidence_cutoff": "2026-09-13", "achievement_state": "SUPPORTED_SCOPED_RESULT", "what_changed": "Electric, magnetic and optical phenomena could be treated within one field theory.", "scope": "The electromagnetic field synthesis and electromagnetic account of light in the 1865 paper.", "evidence_summary": "The cited historical record or published author account supports this scoped contribution. The source-reading boundary is stated at each link; a WRS grade is not an independent scientific validation.", "references": [ { "title": "Smithsonian: original 1865 volume", "url": "https://library.si.edu/digital-library/book/dynamicaltheoryo00maxw", "locator": "Indexed institutional description; direct source text is not included in the reviewed evidence" }, { "title": "Royal Society original manuscript", "url": "https://makingscience.royalsociety.org/items/PT_72_7", "locator": "Archive identity from indexed metadata; source text is not included in the reviewed evidence" } ], "roles": [ { "who": "James Clerk Maxwell", "credit": "SCIENCE", "did": "Field-theoretic synthesis." }, { "who": "Michael Faraday and other predecessors", "credit": "SCIENCE", "did": "Distinct experimental and conceptual antecedents." } ], "target": { "record_id": "urn:uuid:6fc88958-e121-4f53-a956-adf80b8ccf94", "version": 1, "content_hash": "sha256:de451a887306154b856ae4a96b4dd9564655b4c7ca2214f6cfab73c6862c0d37" }, "scientific_correctness_certified": false, "independent_expert_calibration": false, "method": "PROPRIETARY", "points": "800000" }, "canonical_agent_submission": false, "scientific_verification_awarded": false, "reader_guide": { "id": "maxwell", "sections": [ { "title": "The question", "text": "Electricity, magnets and light were once investigated through rather different experiments. A current can affect a compass, a changing magnetic arrangement can induce an electrical effect, and light crosses empty space. Could these observations belong to the same physical theory? Maxwell's 1865 paper made a mathematical electromagnetic field account central to that question, rather than treating each phenomenon as a separate curiosity." }, { "title": "The idea", "text": "The field description assigns physical quantities throughout space. Relations between their spatial and temporal changes can support traveling disturbances. Maxwell connected the propagation predicted by his theory with light. His original notation and mechanical discussion differ from the compact modern set of equations often shown in textbooks. Reading the historical contribution does not require pretending those later equations appeared unchanged in the manuscript." }, { "title": "Why it matters", "text": "A unifying theory can be valuable even before every technological application exists. Here the connection between electricity, magnetism and optics provided a shared way to analyze apparently different measurements. The recorded S grade concerns that field-theory synthesis. It does not award Maxwell authorship of every later electromagnetic experiment, communication device or reformulation. Those developments have their own contributors, dates and evidence." }, { "title": "A teaching example", "text": "Picture a long line of people passing a small motion along without each person walking to the far end. A disturbance can travel through a system even though the local elements do something much smaller. This is a teaching analogy for distinguishing propagation from transport of a material object. An electromagnetic field is not a row of people, and the analogy cannot establish its equations or speed. Ask instead which measured quantity changes locally, which relation couples neighboring regions, and how a proposed model predicts a traveling disturbance." }, { "title": "Scope and a useful next step", "text": "This record covers the historical electromagnetic account of light, not a complete quantum theory of matter or an experimental certification of every modern application. The Royal Society archive identifies the manuscript and publication history. A manageable next step is to compare one original passage with a modern textbook formulation, carefully marking translated notation and later additions. The comparison should preserve the original claim rather than silently crediting the historical paper with the entire modern framework." } ], "target": { "record_id": "urn:uuid:6fc88958-e121-4f53-a956-adf80b8ccf94", "version": 1, "content_hash": "sha256:de451a887306154b856ae4a96b4dd9564655b4c7ca2214f6cfab73c6862c0d37" }, "references": [ { "title": "Royal Society archive PT/72/7, Maxwell’s original manuscript", "url": "https://makingscience.royalsociety.org/items/PT_72_7", "locator": "Identified original contribution source. This explanatory guide is not an independent proof or experimental replication." } ] }, "reading_status": "EXPLANATORY_GUIDE" }