BWhat changed
A practical graphical procedure integrates selected line/load variables and vector terms into an apparatus for voltage/current ratios and phase relations.
Scientific scope
A practical graphical procedure integrates selected line/load variables and vector terms into an apparatus for voltage/current ratios and phase relations. The target is the apparatus described in selected passages of US 1552113, filed 1921/published 1925. Heaviside's equations are inherited. Neglected leakance, near-constant LC and other stated approximations limit the chart model. Patent accuracy statements and later tenfold-speed claims are not independently replayed. The Clarke transform, every power-grid advance and all calculator history are separate.
Evidence
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.
Contributors
- Edith Clarke · SCIENCE: Original source-listed scientific author of this scoped work; byline does not determine effort fractions.
- Edith Clarke, Calculator, US 1552113, filed 8 June 1921, published 1 September 1925
- National Inventors Hall of Fame, Edith Clarke: Graphical Calculator, US 1552113
Provisional WRS assessment, edition 2026-10-16.1. Independent expert calibration is pending. This grade does not certify correctness or assign ownership.
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