Lot 3095. Fresnel, Jean-François

Starting price:CHF 500
Auction date:15.12.2017   10:00
Archive
ID 18558
Lot 3095Fresnel, Jean-François
Fresnel, Jean-François Mémoire sur un nouveau système d'éclairage des phares : lu à l'académie des Sciences, le 29 juillet 1822. Paris: Imprimerie Royale, 1822. 4°. 42 S. 2 (1 gefalt.) Tafn. Brosch.
Around 1820, developed by the young French physicist Augustin Jean Fresnel (1788-1827), a lens with prisms which concentrate the light rays in a certain direction could draw. The Fresnel lenses could increase the range of the beacon considerably, and replaced the previously used mirror designs, and are still used today (albeit in an improved Form). - Very rarely (not in ILAB, ZVAB).

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