Filed application Serial No. 476,075 for the Clarke Calculator.
On June 8, 1921, Edith Clarke filed a patent for her Clarke calculator, a device designed to solve transmission-line equations with hyperbolic functions. This invention drastically improved the speed of calculations in power transmission, performing tasks roughly ten times faster than previous methods. By streamlining complex calculations, it facilitated more efficient design and operation of power systems, a crucial advancement for the rapidly evolving American power grid during the early twentieth century.