Sunday, 23 June 2019

The Lens That Saved A Million Ships


The Lens That Saved A Million Ships
In the 1820s, Augustin Fresnel invented a new kind of lens and installed it in France's Cordouan lighthouse. Suddenly, one lamp could light the way for sailors many miles out to sea.

June 22, 2019 at 05:07AM
via Digg https://bbc.in/31PAkLN

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