THE strongest beam of rays proceeding from lighthouse apparatus in high towers is sent to the sea horizon, as being the direction in which the light can be seen at the greatest distance in clear weather.
"On the Application of Catadioptric Zones to Lighthouses," by Alan Stevenson, LL.B. (Edinburgh, 1840.)
Journal of the Scottish Meteorological Society, new series, vol. v. p. 97.
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STEVENSON, T. On the Vertical Distribution of the Light from Lighthouses Placed at High Elevations above the Sea-Level . Nature 19, 19–20 (1878). https://doi.org/10.1038/019019a0