Before submarine dominance, Sarah Mather underwater telescope allowed the Union Navy to detect Confederate mines beneath the waves. A Brooklyn inventor, she secured USP No 3995 on April 16 1845 for her design. The device was a tube with a lamp on one end and a telescope on the other, letting sailors inspect hulls or scan deep waters for enemy threats. During the Civil War, it provided a vital advantage, and in 1864 she and her son patented an improved version. Her work remains a largely overlook
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