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A man name Augustin Fresnel invented the
Fresnel lens. It is what intensifies the light as it rotates moves around. Because of its amazing efficiency
the lens could easily
throw its light 20 or more miles to the horizon.
- The first Order lens had round areas that would bend the light
into a beam. They were used to create a flashing effect.It also
has a red panel for a red flash.
- The Second Order lens was used on the coast and as
warning lights to mark land, dangerous shoals, rocks or reefs. It was
used quite frequently in the Great Lakes Lights, on islands, and in
sounds.
- The third order lens is cut to simulate a diamond for a more
powerful flash. It magnified the flashes tremendously.
- The fourth order Fresnel Lens magnified a 1,000 watt bulb so that
the ten-second flash could be seen 17.5 miles away
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