The fresnel lens
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The Fresnel Lens. In 1822 the Fresnel lens was invented. An unlimited number of flashing combinations, could be produced. Ships found the lights to be brighter and they could see the lights at greater distances. The Fresnel lens is made of 100’s of pieces of specially cut glass.

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Two types of lenses

Fixed Lens cut glass.

Shows a steady light all around the horizon

Revolving Lens

Produces a flash or characteristic.

The number of flashes per minute depends on the number of flash panels and the speed at which the optic (lens) revolves.

Two types of lenses



Sites noted

Sites Noted glass, the lens intensifies the glow from the lamp.

http://www.uscg.mil/hq/g-cp/history/weblighthouses/lighthouse_curriculum.html

http://www.outer-banks.com/lighthouses.asp


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