A handful of good precision manufacturing company images I located:
Point Vicente Lighthouse
Image by mikepmiller
constructed in 1926 on the Palos Verdes Peninsula. The light supply was dimmed during Planet War II to steer clear of aiding the enemy. It was automated in 1971 by the United States Coast Guard. The original third order Fresnel lens nevertheless revolves in the lantern area.
The Point Vicente Lighthouse is an crucial landmark and beacon light relied upon by thousands of ships and pleasure craft. It provides a signifies of fixing their position, and making certain their secure passage up and down the coast. The Point Vicente Light Station has been guiding sailing vessels to and from the Los Angeles/Extended Beach Harbors considering that March 1926. It was 1st operated and maintained by the United States Lighthouse Service for 13 years prior to the service getting merged with the U.S. Coast Guard, which was delegated all help-to-navigation responsibilities in 1939. The lighthouse was manned until 1971 when it was automated by a remote electronic aids-to-navigation monitoring technique. The cylindrical tower is 67 feet (20 m) tall, and the masonry structure is constructed on the edge of a 130-foot (40 m) cliff. This areas the center of the lantern 185 feet (56 m) above the ocean, and since of this elevation, the 1.1 million candlepower-beam can be noticed 29 miles (47 km) away. The most striking function in the lighthouse is the classical third-order rotating Fresnel Lens located in the lantern. This certain lens was manufactured around 1910 in Paris, France, by Barbier, Bernard and Turenne, the oldest lens producing business in the world. This lens is produced up of hand-ground prisms held in spot by a cast brass frame. The prisms and frame represent an superb instance of the precision achieved by optical scientists and the lens creating art in utilizing the known principles and properties of light.
This lighthouse also incorporates a pleasant-sounding foghorn to audibly warn ships throughout times of low visibility which are frequent to the area.