Image: Souter Lighthouse lenses
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Description: A bi-form (i.e. duplicated) first-order Fresnel-lens optic, manufactured by Chance Brothers of Smethwick in 1914. Floating in a bath of mercury, it revolved around the lamps to produce a red flash once every five seconds.
Title: Souter Lighthouse lenses
Credit: Own work
Author: Barabbas1312
Usage Terms: Creative Commons Attribution-Share Alike 4.0
License: CC BY-SA 4.0
License Link: https://creativecommons.org/licenses/by-sa/4.0
Attribution Required?: Yes
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