![]() The unique color scheme and/or pattern that identifies a specific lighthouse during daylight hours.ĭecommissioned: A lighthouse that no longer functions as a navigational aid.ĭe-staffed: An automated lighthouse without a light-keeper.ĭiaphone: A sound signal, which produces sound by means of a slotted piston moved back and forth by compressed air. They were made up of a series of gears, pulleys and weights, which had to be wound periodically by the keepers.Ĭommissioned: The action of placing a previously discontinued aid to navigation back in operation.Ĭomposite Group Flashing Light: A group-flashing light in which the flashes combined in successive groups of different numbers of flashes.Ĭomposite Group Occulting Light: A light similar to a group-occulting light except that the successive groups in a period have different numbers of eclipses.Ĭottage Style Lighthouse: A lighthouse comprised of a small one story buildig with a light on top that housed the keeper(s).Ĭrib: A structure, usually of timbers, that was sunk in water through filling with stone, and served as the foundation for a concrete pier built atop it.ĭaymark: The daytime identifier of an aid to navigation. They usually have two bull's-eyes, one on each side of the lens.Ĭlockwork Mechanism: The mechanism that turned the light in early lighthouses. This produces the individual flashing pattern of each light, which allows mariners to tell one lighthouse from another.Ĭhariot: The wheeled carriage at the bottom of a Fresnel lens assembly, which allowed the lens to rotate around a circular iron track atop the lens pedestal.Ĭlamshell Lens: Rather than being round as most lenses are the Clamshell, or Bivalve, lenses has a flattened shape reminiscent of a clamshell. Characteristic refers to lights, sound signals, RACONS, radio beacons, and day beacons. ![]() They could be manufactured miles away in a foundry, and transported to the site for erection.Ĭatwalk: A narrow elevated walkway, allowing the keeper access to light towers built out in the water.Ĭharacteristic: The audible, visual, or electronic signal displayed by an aid to navigation to assist in the identification of an aid to navigation. Cast iron was stronger than stone and comparatively light. After the invention of the internal combustion engine they became known as spark plug lights.Ĭast-iron Tower: Usually cylindrical in shape, these lights became popular in the 1840’s. Some referred to them as coffee pot lights or bug lights. The caissons were bolted together on land, transported into place, sunk and filled with sand, gravel, rock or cement. A caisson was essentially a hollow tube made of heavy rolled-iron plates. The light is controlled by a remote control, timers or light and fog detectors.īeacon: A lighted or unlighted fixed aid to navigation.īell: A sound signal producing bell tones by means of a hammer actuated by electricity of fixed aids and by sea motion on buoys.īreakwater: A fixed or floating structure that protects a shore area, harbor, anchorage, or basin by intercepting waves.īull’s-eye Lens: A convex lens used to concentrate (refract) light.Ĭaisson Style Tower: Lighthouse built on an iron caisson. The Argand lamp was named after Ami Argand, the Swiss inventor who developed the design.Īstragal: Metal bar (running vertically or diagonally) dividing the lantern room glass into sections.Īutomated: A lighthouse that has been changed to operate without the aid of a keeper. ![]() ![]() It was the first fuel to eliminate the need for a keeper to carry oil up the tower, since it could be stored on the ground and an automatic sun valve used to turn the light off at daybreak and on again at dusk.Īid to Navigation: A buoy, beacon, lighthouse, lightship or any other structure or device installed, built or maintained for the purpose of assisting the navigation of vessels.Īlternating Light: A rhythmic light showing light of alternating colors.Īrc of Visibility: The portion of the horizon over which a lighted aid to navigation is visible from seaward.Īrgand Lamp: A hollow single-wick oil lamp. Aerobeacon: A searchlight-type light originally designed for use at airports and adapted for use in a number of lighthouses.Īcetylene: A fuel used which began to be used in lighthouses after 1910. ![]()
0 Comments
Leave a Reply. |