Hey, there! Log in / Register

Happy birthday, Boston Light Fresnel lens

The light source may have changed over the years, but the Coast Guard reports that the Fresnel lens that has let mariners know they're nearing Boston Harbor is the same one that was first used on Dec. 21, 1859:

... It's a flashing mechanism is comprised of 4,000 pounds of brass and glass rotating on a clock-works mechanism. ... Boston Light's entire assembly is 11 feet tall comprising of 336 individual prisms with 12 bullseyes. Today, the illuminate in the center of the lens is a 1,000 watt lamp, magnifying the light 2,000,000 candle power that's visible for 27 nautical miles on a clear night. The lighting characteristic is distinguishable from other lights in the harbor with its one flash every 10 seconds. ...

Topics: 


Ad:


Like the job UHub is doing? Consider a contribution. Thanks!

Comments

As a sailer I do appriciate the bright light.

Tommi Heinonen
Mainostoimisto
Hääkuvaus

up
Voting closed 0