Lyngvig Fyr, Lighthouse Lighthouse Fresnel lense, we see the top glashouse from Lyngvig-Lighthouse. A system of lenses and prisms – a combined Fresnel lens – condenses light from the lighting assembly . Four of these lens systems are mounted on a grid of brass. The combine four constant light rays. The whole system is rotating about a vertical axis. The total lantern floating on a ring-shaped vessel filled with mercury . Lanternen foot forming a lid on this vessel . This device provides an almost frictionless movement of the lantern . In order to avoid evaporation must kerosene is poured over the mercury. The boiler personnel should constantly pouring kerosene…