What is recorded here?
Clarke's charts and movable arms support graphical evaluation of inherited distributed-parameter transmission-line equations, yielding voltage/current ratios and phase relations. Engineers could set line and load characteristics on a physical diagram rather than repeat the whole calculation by hand. The patent describes approximations for its chosen line model; a constructed instrument's performance is a separate evidentiary question.
Source-linked catalogue note. A detailed explanatory guide has not yet been prepared for this entry.
Scientific scope
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.
Read the original work
- Edith Clarke, Calculator, US1552113, filed8 June1921, published1 September1925
- National Inventors Hall of Fame, Edith Clarke: Graphical Calculator, US1552113
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People and systems
Edith Clarke
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English catalogue narrative
Clarke: a graphical calculator for long transmission lines
Clarke's charts and movable arms support graphical evaluation of inherited distributed-parameter transmission-line equations, yielding voltage/current ratios and phase relations.
Engineers could set line and load characteristics on a physical diagram rather than repeat the whole calculation by hand. The patent describes approximations for its chosen line model; a constructed instrument's performance is a separate evidentiary question.
Scientific scope
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.
People and systems
Edith Clarke