Search results
Results from the WOW.Com Content Network
An infrared beacon (IR beacon) transmits a modulated light beam in the infrared spectrum, which can be identified easily and positively. A line of sight clear of obstacles between the transmitter and the receiver is essential. IR beacons have a number of applications in robotics and in Combat Identification (CID).
The last visual airway beacon was supposedly shut down in 1973, [12] but a few airway beacons are still operating in Portland, Oregon and Western Montana. [16] Those in Montana are charted on the Great Falls sectional chart. [17] Montana was the last state to officially maintain airway beacons, through the state's Aviation Division.
Beacon Lights of History. The world's heroes and master minds (1888) Modern History for Schools (1850) The Old Roman World (1867) Ancient States and Empires (1869) Life of Emma Willard (1873) Points of History (1881) Beacon Lights of History (14 volumes; 1883–96) This covers the old pagan civilisations through to modern Europe and America in ...
The closer light is referred to as the beacon or front range; the further light is called the rear range. The rear range light is almost always taller than the front. When a vessel is on the correct course, the two lights align vertically, but when the observer is out of position, the difference in alignment indicates the direction of travel to ...
Light, tower, shed, and concrete arrow. The lighted Airway Beacons were a substantial navigation aid in an era prior to the development of radio navigation. However, their effectiveness was limited by visibility and weather conditions. 24 inches (610 mm) diameter rotating beacons were mounted on 53-foot (16 m) high towers, and spaced ten miles ...
In a rugged coastal area like Scandinavia, his mass-produced, robust, minimal maintenance lights were a significant boon to safety and livelihood. AGA Lighthouses covered the entire Panama Canal. The technology was the predominant form of light source in lighthouses from the 1900s through the 1960s, when electric lighting had become dominant.
Course of the main beacon line between Constantinople and Loulon on the Cilician Gates. In the 9th century, during the Arab–Byzantine wars, the Byzantine Empire used a semaphore system of beacons to transmit messages from the border with the Abbasid Caliphate across Asia Minor to the Byzantine capital, Constantinople.
A Belisha beacon atop its striped pole. This example also features a spot lamp to illuminate the crossing at night. A Belisha beacon (/ b ə ˈ l iː ʃ ə /) is a yellow-coloured globe lamp atop a tall black and white striped pole, marking pedestrian crossings of roads in the United Kingdom, [1] Ireland, and other countries historically influenced by Britain, such as Hong Kong, Cyprus, Malta ...