Holophotal Light

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“Holophotal Fixed Light varied by Flashes.—Fresnel’s double agents are here also dispensed with by the single agency of panels of fixed light apparatus p’, p’ and cylindrical refractors L’, L’, alternating with panels of holophotal apparatus p, p, L, L, both of which revolve together round the central burner.” —The Encyclopedia Britannica, 1910

Keywords

light, fixed, burner, cylindrical, Refractor, Holophotal, Flash

Galleries

Lighthouses, Lenses and Refraction

Source

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

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