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    "title": "Wheatstone: measuring resistance by restoring a balance",
    "summary": "Wheatstone develops practical adjustable-resistance and balance methods for comparing electrical circuit constants, including a differential resistance measurer whose original principle he credits to Christie.\n\nInstead of assuming that every angle of a galvanometer is already calibrated, these methods return its needle to the same reading or to zero. An adjustable wire or known resistance supplies the comparison. A balanced arrangement splits one source current into two paths, allowing a small resistance difference to disturb the needle while ordinary source-strength fluctuations leave an established balance intact. Wheatstone packages that idea with working instruments, standards and procedures; the underlying circuit law and the earlier balance principle keep their own credit.",
    "boundary": "The target is Wheatstone's 1843 measurement methods and constructions, especially sections 16-18, within an Ohmic, steady circuit. It is not the first invention of the balance principle: the page 325 footnote explicitly assigns that idea to Christie's 1833 work. Wire geometry, material and adjustment matter; the differential instrument is unsuitable for substances whose electrical action creates opposing electromotive forces through chemical change. The separate-source arrangement in section 17 is more sensitive but loses balance when either source changes. Other substitution methods require sufficiently constant sources or matched elements. The liquid measurements must be made before current changes the solution, and the proposed survey is deferred. The current-divider calibration instrument is matched to its own galvanometer. Historical copper-wire resistance units, author sensitivity claims and possible applications are not certified modern accuracy or deployment. no apparatus was replayed.",
    "area": "Electrical measurement and instrumentation",
    "topic": "Engineering",
    "year": 1843,
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        "id": "wrs24-wheatstone-balanced-resistance-1843-original",
        "title": "Charles Wheatstone, The Bakerian Lecture: instruments and processes for determining the constants of a voltaic circuit (1843), original facsimile",
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      "what_changed": "Wheatstone develops practical adjustable-resistance and balance methods for comparing electrical circuit constants, including a differential resistance measurer whose original principle he credits to Christie.",
      "scope": "Wheatstone develops practical adjustable-resistance and balance methods for comparing electrical circuit constants, including a differential resistance measurer whose original principle he credits to Christie. The target is Wheatstone's 1843 measurement methods and constructions, especially sections 16-18, within an Ohmic, steady circuit. It is not the first invention of the balance principle: the page 325 footnote explicitly assigns that idea to Christie's 1833 work. Wire geometry, material and adjustment matter; the differential instrument is unsuitable for substances whose electrical action creates opposing electromotive forces through chemical change. The separate-source arrangement in section 17 is more sensitive but loses balance when either source changes. Other substitution methods require sufficiently constant sources or matched elements. The liquid measurements must be made before current changes the solution, and the proposed survey is deferred. The current-divider calibration instrument is matched to its own galvanometer. Historical copper-wire resistance units, author sensitivity claims and possible applications are not certified modern accuracy or deployment. no apparatus was replayed.",
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          "name": "Charles Wheatstone",
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            "discoverer"
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          "source": {
            "citation": "Charles Wheatstone, The Bakerian Lecture: instruments and processes for determining the constants of a voltaic circuit (1843), original facsimile",
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            "citation": "Charles Wheatstone, The Bakerian Lecture: instruments and processes for determining the constants of a voltaic circuit (1843), original facsimile",
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      "scope": {
        "description": "The target is Wheatstone's 1843 measurement methods and constructions, especially sections 16-18, within an Ohmic, steady circuit. It is not the first invention of the balance principle: the page 325 footnote explicitly assigns that idea to Christie's 1833 work. Wire geometry, material and adjustment matter; the differential instrument is unsuitable for substances whose electrical action creates opposing electromotive forces through chemical change. The separate-source arrangement in section 17 is more sensitive but loses balance when either source changes. Other substitution methods require sufficiently constant sources or matched elements. The liquid measurements must be made before current changes the solution, and the proposed survey is deferred. The current-divider calibration instrument is matched to its own galvanometer. Historical copper-wire resistance units, author sensitivity claims and possible applications are not certified modern accuracy or deployment. no apparatus was replayed.",
        "domain": "Electrical measurement and instrumentation"
      },
      "sources": [
        {
          "citation": "Charles Wheatstone, The Bakerian Lecture: instruments and processes for determining the constants of a voltaic circuit (1843), original facsimile",
          "url": "https://g6yb.com/g3ynh/zdocs/bridges/general/refs/Wheatstone1843_several_new_instr.pdf"
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      ],
      "statement": "# Wheatstone: measuring resistance by restoring a balance\n\nWheatstone develops practical adjustable-resistance and balance methods for comparing electrical circuit constants, including a differential resistance measurer whose original principle he credits to Christie.\n\nInstead of assuming that every angle of a galvanometer is already calibrated, these methods return its needle to the same reading or to zero. An adjustable wire or known resistance supplies the comparison. A balanced arrangement splits one source current into two paths, allowing a small resistance difference to disturb the needle while ordinary source-strength fluctuations leave an established balance intact. Wheatstone packages that idea with working instruments, standards and procedures; the underlying circuit law and the earlier balance principle keep their own credit.\n\n## Scientific scope\n\nThe target is Wheatstone's 1843 measurement methods and constructions, especially sections 16-18, within an Ohmic, steady circuit. It is not the first invention of the balance principle: the page 325 footnote explicitly assigns that idea to Christie's 1833 work. Wire geometry, material and adjustment matter; the differential instrument is unsuitable for substances whose electrical action creates opposing electromotive forces through chemical change. The separate-source arrangement in section 17 is more sensitive but loses balance when either source changes. Other substitution methods require sufficiently constant sources or matched elements. The liquid measurements must be made before current changes the solution, and the proposed survey is deferred. The current-divider calibration instrument is matched to its own galvanometer. Historical copper-wire resistance units, author sensitivity claims and possible applications are not certified modern accuracy or deployment. no apparatus was replayed.\n\n## People and systems\n\nCharles Wheatstone\n\n\n\n## Original sources\n\n- [Charles Wheatstone, The Bakerian Lecture: instruments and processes for determining the constants of a voltaic circuit (1843), original facsimile](https://g6yb.com/g3ynh/zdocs/bridges/general/refs/Wheatstone1843_several_new_instr.pdf)\n",
      "summary": "Wheatstone develops practical adjustable-resistance and balance methods for comparing electrical circuit constants, including a differential resistance measurer whose original principle he credits to Christie.\n\nInstead of assuming that every angle of a galvanometer is already calibrated, these methods return its needle to the same reading or to zero. An adjustable wire or known resistance supplies the comparison. A balanced arrangement splits one source current into two paths, allowing a small resistance difference to disturb the needle while ordinary source-strength fluctuations leave an established balance intact. Wheatstone packages that idea with working instruments, standards and procedures; the underlying circuit law and the earlier balance principle keep their own credit.",
      "title": "Wheatstone: measuring resistance by restoring a balance"
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    "edition": "2026-10-28.1",
    "id": "wheatstone-balanced-resistance-measurement-1843",
    "entry_id": "wheatstone-balanced-resistance-measurement-1843",
    "revision": 1,
    "title": "Wheatstone: measuring resistance by restoring a balance",
    "context": "Electrical measurement and instrumentation",
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    "what_changed": "Wheatstone develops practical adjustable-resistance and balance methods for comparing electrical circuit constants, including a differential resistance measurer whose original principle he credits to Christie.",
    "scope": "Wheatstone develops practical adjustable-resistance and balance methods for comparing electrical circuit constants, including a differential resistance measurer whose original principle he credits to Christie. The target is Wheatstone's 1843 measurement methods and constructions, especially sections 16-18, within an Ohmic, steady circuit. It is not the first invention of the balance principle: the page 325 footnote explicitly assigns that idea to Christie's 1833 work. Wire geometry, material and adjustment matter; the differential instrument is unsuitable for substances whose electrical action creates opposing electromotive forces through chemical change. The separate-source arrangement in section 17 is more sensitive but loses balance when either source changes. Other substitution methods require sufficiently constant sources or matched elements. The liquid measurements must be made before current changes the solution, and the proposed survey is deferred. The current-divider calibration instrument is matched to its own galvanometer. Historical copper-wire resistance units, author sensitivity claims and possible applications are not certified modern accuracy or deployment. no apparatus was replayed.",
    "evidence_summary": "Source-linked, scoped account of the original work. The published scope states the scientific assumptions and remaining verification limits. WRS has not independently certified the full proof, experimental result or system benchmark.",
    "references": [
      {
        "title": "Charles Wheatstone, The Bakerian Lecture: instruments and processes for determining the constants of a voltaic circuit (1843), original facsimile",
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