. Lighthouse is a tower designed to emit light from system of lamps.
. Used to help navigators to find their way during night time.
. Also warn them in case of danger.
. It is like traffic sign on the sea.
. Lighthouse of Alexandria was first lighthouse in the world built in 290 BC.
. Earlier, lighthouses were lit by open fires or candles on the top.
. Eventually, kerosene, whale oil were used for brighter lights to emit.
. In 1800's, Augustin Fresnel invented Fresnel lens.
. With use of that, light is concentrated and projected by using series of lens.
. It transmits over longer distance.
. Used to help navigators to find their way during night time.
. Also warn them in case of danger.
. It is like traffic sign on the sea.
. Lighthouse of Alexandria was first lighthouse in the world built in 290 BC.
. Eventually, kerosene, whale oil were used for brighter lights to emit.
. In 1800's, Augustin Fresnel invented Fresnel lens.
. With use of that, light is concentrated and projected by using series of lens.
. It transmits over longer distance.
Use of Morse Code:
. To convey any message, morse code can be used in lighthouses.
. ON/OFF of light as per dot and dash.
. ON/OFF of light as per dot and dash.
. Suppose to say 'M', light is 3 seconds on, 1 second off, 3 seconds on.
. Also to communicate between two ships travelling together, concept of Lighthouse and Morse code can be used for communication.
Visibility of light:
. Visual range depends on both height of lighthouse and the viewer.
. Calculated by formula: 1.23 miles * sqrt(height of tower from water level).
Decline of lighthouses:
. There are many lighthouses along long coastal line of India.
. Lighthouses are still in use today, but not as necessary as once they were.
. Lighthouses are still in use today, but not as necessary as once they were.
. Due to advancement in electronic navigation systems like GPS, Satellite tracking systems, lighthouse are not much useful.
. Also their expenses to maintain them lead to shutting down of most of lighthouses.