GRAVES LEDGE, BOSTON HARBOR — Dave Waller and Bobby Sager are used to taking on daunting projects. A decade ago, they bid against each other at the government auction for Graves Light, a historic ...

A lens manufactured in France in 1902 is shining high atop Montauk Point Lighthouse once again. Earlier this month the U.S. Coast Guard relit the clamshell-shaped Fresnel lens, which guided mariners ...

You may know them best for their original use in lighthouses, where they're famously recognised as "the invention that saved a million ships". Or perhaps you initially think of their employment in ...

Ancient origins: The first great lighthouse, the Pharos of Alexandria, was built in 285 BC and inspired centuries of maritime navigation aids. Fresnel revolution: In 1822, Augustin Fresnel’s lens ...