The Fresnel Lens: the Invention That Saved 1000 Ships
Our Own Devices
@canadianmacgyverAbout
Ever wonder how a rotary telephone works, how sailors and pilots navigated by the stars, or how mechanical calculators perform complex math using only gears? Then you've come to the right place! Our Own Devices is a channel dedicated to the fascinating world of vintage technology, and the many elegant and ingenious ways our ancestors solved even the most complex technical problems. Want more fascinating history? I am a regular staff writer for Today I Found Out and many of its sister channels: https://www.youtube.com/@TodayIFoundOut I also have a historical adventure novel titled 'Our Own Devices' set in 1920s Morocco. Check it out at my personal website: www.gillesmessier.ca And finally, I make 1920s/30s-style Art Deco posters, which you can purchase on my Etsy store: https://www.etsy.com/ca/shop/DecoEchoes
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Like what I make? Want fewer sponsorship ad reads? Consider contributing to my Patreon at https://patreon.com/OurOwnDevices Perfected in the 1820s, the Fresnel Lens is a lightweight, low-profile lens composed of annular segments, originally developed for use in lighthouses. The design allows for the construction of extremely large lenses that can collect and collimate nearly all the light emitted by a lamp and project it over large distances. As well as lighthouses, Fresnel lenses are used in a number of other applications, from theatre lighting to lightweight home magnifiers. SOURCES: https://uslhs.org/hyper-radial-lenses https://www.smithsonianmag.com/science-nature/science-makes-a-better-lighthouse-lens-170677431/ http://www.michiganlights.com/fresnel.htm https://www.lighthousefriends.com/light.asp?ID=141 https://uslhs.org/lens-use-prior-fresnel https://uslhs.org/fresnel-lens https://web.archive.org/web/20070927021951/http://www.marinecitymich.org/Blank%20Page.htm https://www.bbc.com/travel/article/20190620-the-invention-that-saved-a-million-ships
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