Sarah Mather, the American inventor best known for patenting the first underwater telescope, died. Her death marked the end of a life dedicated to innovation, though her invention continued to impact naval technology and inspire future underwater exploration devices.

Sarah Mather received a patent (US43465A) for her invention of the “submarine telescope and lamp”. This marked a significant achievement for Mather and women inventors of the time, as it recognized the value and innovation of her device for underwater observation.