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#1
December 26th 05, 01:26 AM
posted to sci.astro.amateur
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web sites; lighthouse optics
Thanks to SAA for the help in finding websites listing upcoming
space/astronomy events. Some readers might be interested in lenses used in lighthouses. I collect images of these Fresnel lenses. Three of the biggest are shown in these images: http://home.europa.com/ ~telscope/temp/Makapuu.Light.Hyper.radiant.lens.jpg 180kb http://home.europa.com/ ~telscope/temp/Makapuu.lens.8.75ft.diam.13ft.high.1140.prisms.190 9.jpg 600kb http://home.europa.com/~telscope/temp/hyper- radial.Manora.Point.LH.Pakistan.-Chance.Bros.15.tons.20ft.jpg 450kb -- ============================================= Peter Abrahams telscope.at.europa.dot.com The history of the telescope and the binocular: http://home.europa.com/~telscope/binotele.htm 
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