What is recorded here?
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. Instead 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.
Source-linked catalogue note. A detailed explanatory guide has not yet been prepared for this entry.
Scientific scope
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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People and systems
Charles Wheatstone
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English catalogue narrative
Wheatstone: measuring resistance by restoring a balance
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.
Instead 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.
Scientific scope
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.
People and systems
Charles Wheatstone