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The Penedo da Saudade lighthouse started operations on February 15, 1912. At that time it was equipped with a rotating 3rd–order optical device with a 500mm focal length and the light was fuelled by oil vapour. [2] [3] From March 1916 to December 1919 the light was extinguished due to World War I.
It is important to allow maximum ventilation, especially in the summer months, to eliminate interior condensation. This ventilation can be achieved through a mounted passive louver system. A protective coating of either paint, stucco, or lime-mortar-wash is typically applied to concrete lighthouses as a layer of defense from external elements. [4]
Light fixtures may also have other features, such as reflectors for directing the light, an aperture (with or without a lens), an outer shell or housing for lamp alignment and protection, an electrical ballast or power supply, and a shade to diffuse the light or direct it towards a workspace (e.g., a desk lamp).
Vertical light rays of the lamp are redirected into a horizontal plane, and horizontally the light is focused into one or a few directions at a time, with the light beam swept around. As a result, in addition to seeing the side of the light beam, the light is directly visible from greater distances, and with an identifying light characteristic.
A lantern is a source of lighting, often portable. It typically features a protective enclosure for the light source – historically usually a candle, a wick in oil, or a thermoluminescent mesh, and often a battery-powered light in modern times – to make it easier to carry and hang up, and make it more reliable outdoors or in drafty interiors.
After the opening of the new Leça Lighthouse, it ceased to operate and initially served as a dormitory for the students of the School of Lighthouse Keepers, later being demolished. The stone masonry that provided the base for the tower can still be seen. [1] [2] The Leça Lighthouse came into operation on a trial basis on 15 December 1926.
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