4th Order Fresnel Lens (1935- June 1974) 


This 4th Order Fresnel lens is the one that was used in the Pomham Rocks Lighthouse from 1939 until 1974 and is now on display in the Custom House Maritime Museum in Newburyport, Massachusetts. This lens weighs roughly 300lbs and is around 2 feet tall!!

© Pomham Rocks Lighthouse 2018