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


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


TIFF (full resolution)

1572×2400, 631.7 KiB

Large GIF

670×1024, 100.5 KiB

Medium GIF

419×640, 53.1 KiB

Small GIF

209×320, 21.4 KiB