How Beacons Beam:
The Fresnel Lens was invented by an early nineteenth century French physicist Augustin Jean Fresnel [pronounced Frey-nel]. The special lens casing was designed to create a powerful illuminating beam from a small oil lamp. A jagged glass construction houses an internal rotating case directs light into an intense beam. The light is capable of directing the beam to guide ships up to twenty miles away.
The Fresnel Lens
The Red Sector
A No-Go Zone.
A distinctive feature of many lighthouses, is an area of ruby red glass in the lantern room . It is designed to serve as a critical navigational aid. The “red sector” is often a tall piece of ruby red glass the Fresnel light shines through. It marks hazardous areas to alert mariners of potential dangers. The shining red beam of light projects onto shoals or nearby land. It provides a clear visual indicator of treacherous zones, ensuring they can warn vessels to steer clear. By distinguishing safe waters from perilous ones, the red sector plays a vital role in preventing maritime accidents and ensuring the safety of those navigating near the coastline.
Fog & Radio Information
From Dings to Pings!
Alaska’s lighthouse history has over 100 years of maritime stories. Come adventure with us!