All articles
Everything on Two Beams Field Guide, organised by topic.
Beacons & History
- How Does a Fresnel Lens Work in a Lighthouse? — A lighthouse Fresnel lens redirects lamplight through shaped glass into concentrated beams or a sheet of light.
- Why Lighthouses Had Fog Signals as Well as Lights — Historic light stations used fog signals to provide an audible identifying pattern when poor visibility obscured the light.
- Why Navesink Twin Lights Has Two Towers — Navesink Twin Lights was built with two towers to give mariners a distinctive signal near the approaches to New York Harbor.
Plan the Climb
- How to Visit Twin Lights in New Jersey — Plan a Twin Lights visit through the New Jersey State Parks page, which provides the current address, grounds and lighthouse hours, last-climb time, fees,…