Parabolic Profile

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“In order strictly to equalize a fixed light over the whole horizon, which could not possibly be done with separate reflectors, Marcet proposed this ingenious instrument, which is generated by the revolution of the parabolic profile pp’ round its parameter as a vertical axis, instead of round a horizontal axis, as in all former reflectors.” —The Encyclopedia Britannica, 1910

Keywords

lighthouse, profile, mirror, light, reflection, Reflector, Parabolic, Hutchinson, Paraboloid, Catoptric

Galleries

Miscellaneous Optics

Source

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

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