Hertha Ayrton was granted US Patent No. 310,450 for her line-divider.
On May 6, 1884, Hertha Ayrton was awarded United States Letters Patent No. 310,450 for an innovative "Mathematical Dividing Instrument". This invention, known as a line-divider, helped enhance precision in dividing lines and figures, a valuable tool for engineers and architects. The achievement underscores Ayrton's ingenuity and marks the start of her prolific career in patents. Her recognition in a male-dominated field showcased her resilience and set a precedent for future female inventors.