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On The Water > Fresnel lighthouse lens > Flashcards

Fresnel lighthouse lens Flashcards

1
Q

lens specs

A

3rd order lens
beam could be seen 17 miles away

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2
Q

lens history

A

installed in Bolivar Point Light Station, Galveston, TX
survived a hurricane August 1915 that swept away most of Bolivar Point

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3
Q

Fresnel lens history

A

invented 1822 by Augustin Fresnel, of French Commission on Lighthouses

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4
Q

Fresnel lens order

A

Hyper-Radial, largest
eighth order, smallest

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On The Water (10 decks)

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