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Earliest Technology?

Forum to discuss all areas of lighthouse technology such as optics, fuels, fog signals, radiobeacons, daymarks, construction, etc.

Postby COTA » Fri Apr 01, 2005 5:59 am


Hey guys. Just wondering. What was the earliest technology in regards to the type oil and/or pumping mechanisms, etc. used to shine the light from the Fresnel lens? (I hope I am asking this question right for the answer I'm looking for).

Thanks. Beth
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Postby Optics » Fri Apr 01, 2005 6:34 am


The first lamp used in a Fresnel lens was made by Augustin Fresnel and Francois Arago. It had 4 concentric wicks and burned Colza oil what we today call Canola oil. The lamp used a clockwork oil pumping mechanism that was originally designed by Monsieur Carcel.
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Postby COTA » Fri Apr 01, 2005 11:55 am


Thanks.
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Postby island » Thu Apr 07, 2005 10:51 am


Was this lens the eight sided bulls eye configuration with eight mirors above the lens that was installed at Cordouan France? What order would it have been?
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Postby Optics » Thu Apr 07, 2005 12:59 pm


Yes! It was eight sided with bull's-eye panels and mirrors both above and below the dioptric panels. It was 1st Order and was installed at Cordouan in 1823. It is now on display on the island of Ouessant on France.
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Postby Terry_Pepper » Thu Apr 07, 2005 4:07 pm


For those who may be unfamiliar with Fresnel’s groundbreaking lens installed at Cordouan, here is a cross section taken from page 27 of the 1878 edition of Johnnson’s New Universal Cyclopedia, in a fascinating section on lighthouse illumination:

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Postby island » Thu Apr 07, 2005 5:29 pm


This site has another drawing of the Cordouan lens.

http://www.artworks-florida.com/content ... y2.content

And, wow! This site has photos of the lens.
Open Aids of Nav, then open Lenses and Pedistals
http://www.fyr.org/indexe.htm
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Postby plebetkin » Mon Apr 11, 2005 8:34 am


Terry,

how detailed is the encyclopedia article (written portion)?
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