Patent granted for the Clarke calculator (US 1,552,113).
The patent for Edith Clarke's revolutionary invention, the Clarke calculator, was granted on September 1, 1925. This groundbreaking device symbolized a leap forward in engineering practices by enabling power engineers to perform complex transmission line calculations more efficiently. By providing a method to solve hyperbolic equations graphically, the calculator brought unprecedented accuracy and speed to power grid calculations. Clarke's work demonstrated the practical applications of theoretical mathematics in solving real-world engineering problems, inspiring future innovations within the discipline.