Dioptric Light

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“First Application of Total Reflexion to Fixed Lights. In this apparatus Fresnel substituted his totally reflecting prism p and lens R for Marcet’s reflector, and thus distributed the whole light equally over the horizon by means of dioptric agents alone. This was the first application of total reflexion to lighthouse apparatus, and this beautiful instrument continues till now in universal use.” —The Encyclopedia Britannica, 1910


The Encyclopedia Britannica, New Warner Edition (New York, NY: The Werner Company, 1893)


TIFF (full resolution)

1929×2400, 1.9 MiB

Large GIF

823×1024, 241.2 KiB

Medium GIF

514×640, 112.0 KiB

Small GIF

257×320, 36.2 KiB